A modified regenerant, its preparation method and application

Abstract

This application relates to the technical field of highway engineering, and specifically discloses a modified regenerant and its preparation method and application. The modified regenerant disclosed in this application comprises the following components in parts by weight: 45-55 parts of SBS modifier, 22-28 parts of mixing agent, 16-24 parts of stabilizer, 14-20 parts of component regulator; the component regulator comprises trimethylolpropane tris(3-aziridinyl)propionate, terminal amino hyperbranched polyamide, and fatty alcohol polyoxyethylene ether with a weight ratio of (8-13):(2-5):(1-4):(1-3); the mixing agent comprises resin and sodium rosinate with a weight ratio of (22-28):(1-3). This application discloses the preparation method and application of this modified regenerant. This modified regenerant is used in the thermal regeneration treatment of asphalt, can be used at about 140 °C, and plays a role in component adjustment and mechanical enhancement during the mixing process, obtaining regenerated asphalt with excellent performance.

Description

Technical Field

[0001] This application relates to the technical field of highway engineering, and specifically relates to a modified regenerant, a preparation method thereof, and an application thereof. Background Art

[0002] With the arrival of the large-scale maintenance period of asphalt pavements and the reconstruction and expansion period of high-grade highways, a large amount of old material resources lack efficient utilization methods, while high-quality engineering stone materials are becoming increasingly scarce and asphalt prices are constantly rising, and the demand for high-performance thermal regeneration is becoming increasingly prominent.

[0003] Compared with newly mixed asphalt mixtures, in addition to the improvement of the high-temperature rutting resistance index due to the "hardening" of asphalt, the other properties of the old asphalt pavement mixture (RAP material) basically show a deteriorating trend: the reduction of adhesion leads to a serious decline in water stability and anti-stripping performance, and the aging of asphalt leads to a decrease of about 80% in fatigue crack resistance performance and about 35% in low-temperature crack resistance performance. At present, the regeneration of aged asphalt generally focuses on coordinating the components of aged asphalt. Although it can restore and improve the component composition of aged asphalt to a certain extent, it cannot effectively restore the performance of SBS modifiers. Therefore, it is difficult to realize the regeneration of modified asphalt, and it will inevitably affect the success or failure of the regeneration application project.

[0004] At the same time, for mixtures constructed with heavy traffic asphalt, when they are regenerated after being used for a certain number of years, even through maximum regeneration, the properties of the asphalt materials contained in the regenerated pavement are still at the level of heavy traffic asphalt and are difficult to be upgraded to modified asphalt. Obviously, heavy traffic asphalt can no longer meet the requirements of high-grade pavements for asphalt materials.

[0005] There are mainly two ways to improve the performance of recycled asphalt mixtures by modifiers: adding external modifiers to the newly added asphalt materials (wet process); directly incorporating external modifiers into the mixtures when mixing recycled asphalt mixtures (dry process). For the wet process, since the newly added asphalt and regenerant generally do not exceed 10%, and the dispersion of modifiers in asphalt generally does not exceed 8%, the proportion of modifiers converted into the overall asphalt (including old asphalt) is not greater than 0.8%. For the current modifier dosage of 4-6% in modified asphalt mixtures, this obviously cannot achieve a sufficient modification effect. The dry process modifiers are not limited by the RAP and newly added asphalt dosages, and only need to add different proportions of external modifiers according to specific situations. However, the dry process of thermal regeneration places strict requirements on the properties of external modifiers, which need to play the roles of component adjustment and mechanical enhancement simultaneously during the short mixing process. Especially during on-site hot regeneration construction with relatively strict mixing requirements, the average mixing temperature is only about 140°C, while the current mixing of SBS modification technology on newly built roads is generally about 180°C.

[0006] Therefore, it is urgent to develop a directly added SBS modified rejuvenator that can meet the mixing conditions at about 140°C, comprehensively improve the performance of hot recycled mixtures, especially the performance indicators of severely deteriorated RAP materials, greatly enhance the service durability of recycled asphalt pavements from the perspective of material performance, realize the direct recycling of ordinary asphalt pavements into modified asphalt mixtures, and the recycling of deteriorated SBS modified asphalt pavements into more excellent SBS modified asphalt mixtures, so as to maximize the utilization of old asphalt pavement resources with high added value. Summary of the Invention

[0007] In order to meet the mixing conditions at about 140°C and comprehensively improve the performance of hot recycled mixtures, the present application provides a modified rejuvenator and its preparation method and application.

[0008] In the first aspect, the present application provides a modified rejuvenator.

[0009] A modified rejuvenator, comprising the following components in parts by weight: 45 - 55 parts of SBS modifier, 22 - 28 parts of mixing agent, 16 - 24 parts of stabilizer, 14 - 20 parts of component regulator;

[0010] The component regulator comprises pentaerythritol tris(3-aziridinyl)propionate, terminal amino hyperbranched polyamide, glycerol monostearate, and fatty alcohol polyoxyethylene ether in a weight ratio of (8 - 13):(2 - 5):(1 - 4):(1 - 3);

[0011] The mixing agent comprises resin and sodium rosinate in a weight ratio of (22 - 28):(1 - 3).

[0012] The inventors of the present application found that using pentaerythritol tris(3-aziridinyl)propionate, terminal amino hyperbranched polyamide, glycerol monostearate, and fatty alcohol polyoxyethylene ether as the component regulator, in synergistic cooperation with the SBS modifier, mixing agent, and stabilizer, and combining the components in this technical solution, the obtained modified rejuvenator can be used in the hot recycling treatment technology of asphalt, and can reduce the mixing temperature of asphalt and asphalt mixtures and realize the recycling of old asphalt mixtures. That is, the modified rejuvenator can be used under the working condition of about 140°C at low temperature, and can play a role in component adjustment and mechanical enhancement during the short-time mixing process with old asphalt mixtures and new asphalt, so as to simultaneously restore the aged asphalt and the aged SBS modifier, and obtain recycled asphalt with excellent properties such as high-temperature rutting resistance, low-temperature cracking resistance, water damage resistance, and fatigue resistance.

[0013] The component regulator used in this application can reconcile the aged asphalt components in the waste mixture, supplement the light components, restore their properties to a certain extent, improve the low-temperature cracking and water damage resistance of the material, and thus improve its comprehensive performance. The terminal amino hyperbranched polyamide in the component regulator has abundant amino groups and amide bonds and relatively high reactivity, and can rapidly undergo cross-linking grafting reactions with the SBS modifier, mixing agent, and stabilizer in the modified regenerant to form a stable internal structure of the modified regenerant; trimethylolpropane tris(3-aziridinyl) propionate, glycerol monostearate, and fatty alcohol polyoxyethylene ether have relatively high lubricating and permeating properties, can improve the dispersibility of each raw material substance, enhance the compatibility between each raw material substance, and through the synchronous addition of terminal amino hyperbranched polyamide, can synergistically produce the effects of thickening and viscosity increase, further improve the toughness of the material, strengthen the adhesion between the modifier and the stone, and improve the low-temperature cracking and water damage resistance of the material.

[0014] Preferably, the addition amount of the component regulator is 17-20 parts.

[0015] In a specific embodiment, the addition amount of the component regulator can be 14 parts, 17 parts, or 20 parts.

[0016] In some specific embodiments, the addition amount of the component regulator can also be 14-17 parts.

[0017] Through experimental analysis, it can be known that when the addition amount of the component regulator in this application is controlled within the above range, the comprehensive performance of the hot recycling mixture can be significantly improved.

[0018] Preferably, the component regulator includes trimethylolpropane tris(3-aziridinyl) propionate, terminal amino hyperbranched polyamide, glycerol monostearate, and fatty alcohol polyoxyethylene ether with a weight ratio of (11-13):(2-4):(1-3):(1-2).

[0019] In a specific embodiment, the weight ratio of trimethylolpropane tris(3-aziridinyl) propionate, terminal amino hyperbranched polyamide, glycerol monostearate, and fatty alcohol polyoxyethylene ether can be 12:3:2:1.5, 11:2:1:1, 13:2:3:2, 13:3:3:2, 13:3:3:2.

[0020] In some specific embodiments, the weight ratio of trimethylolpropane tris(3-aziridinyl) propionate, terminal amino hyperbranched polyamide, glycerol monostearate, and fatty alcohol polyoxyethylene ether can also be (11-12):2:(1-3):(1-2), (11-13):(2-4):3:(1-2), (11-13):(2-4):1:(1-2), (9-11):2:3:(1-2).

[0021] Through experimental analysis, it can be known that when the weight ratio of trimethylolpropane tris(3-aziridinyl) propionate, amino-terminated hyperbranched polyamide, glycerol monostearate, and fatty alcohol polyoxyethylene ether in the component regulator is controlled within the above range, the comprehensive performance of the recycled asphalt can be further improved.

[0022] Preferably, the molecular weight of the amino-terminated hyperbranched polyamide is 350 - 2200 g / mol.

[0023] Furthermore, the molecular weight of the amino-terminated hyperbranched polyamide is 800 - 1000 g / mol.

[0024] Through experimental analysis, it can be known that when the molecular weight of the amino-terminated hyperbranched polyamide is within the above range, the comprehensive performance of the recycled asphalt can be further improved.

[0025] Preferably, the preparation method of the component regulator is as follows:

[0026] Weigh the corresponding weights of trimethylolpropane tris(3-aziridinyl) propionate, glycerol monostearate, and fatty alcohol polyoxyethylene ether, and place them under the condition of 140 - 160 °C for sufficient mixing;

[0027] Then add the amino-terminated hyperbranched polyamide to the reaction system. While adding, heat the reaction system to 200 - 240 °C, and continuously stir for 20 - 30 min at the same time. Then cool down to 140 - 160 °C and keep the temperature unchanged to obtain the component regulator for standby.

[0028] In this application, using the above preparation method, first mix trimethylolpropane tris(3-aziridinyl) propionate, glycerol monostearate, and fatty alcohol polyoxyethylene ether, then add the amino-terminated hyperbranched polyamide to the reaction system, and at the same time adjust the reaction system to 200 - 240 °C to obtain the component regulator; then cooperate with the SBS modifier, mixing agent, and stabilizer to blend and produce fusion, and through restoring the aged asphalt and the aged SBS modifier, obtain recycled asphalt with excellent properties such as high-temperature rutting resistance, low-temperature cracking resistance, water damage resistance, and fatigue resistance.

[0029] In addition, during the preparation process of the component regulator, by screening the appropriate feeding sequence and controlling the temperature to rise and then fall, the components in the component regulator can form particles with small particle size and uniform distribution, which is beneficial to further improving the crosslinking property between the components in the modified regenerant, thereby further enhancing the overall quality of the recycled asphalt mixture. Furthermore, the temperature for the reaction system to rise is 210 - 230 °C.

[0030] In a specific embodiment, the temperature for the reaction system to rise can be 200 °C, 210 °C, 220 °C, 230 °C, 240 °C.

[0031] In some specific embodiments, the temperature for raising the temperature of the reaction system may also be 200 - 210 °C, 200 - 220 °C, 200 - 230 °C, 200 - 240 °C, 210 - 220 °C, 210 - 240 °C, 220 - 230 °C, 220 - 240 °C, 230 - 240 °C.

[0032] In the present application, by using the above preparation method, pentaerythritol tris(3 - aziridinyl) propionate, amino - terminated hyperbranched polyamide, glycerol monostearate, and fatty alcohol polyoxyethylene ether are mixed and heated and stirred evenly to obtain a component regulator. By screening a suitable mixing temperature, the performance of the modified regenerant for thermally regenerated asphalt can be further improved.

[0033] Preferably, the SBS modifier is produced by Guolu High - Tech Engineering Technology Research Institute Co., Ltd.

[0034] Furthermore, the melt index of the SBS modifier is 4 g / 10 min, and the particle size is 50 - 150 μm.

[0035] The SBS modifier used in the present application can be directly added to the mixing process. During the short - time mixing process with other components in the modified regenerant, it can achieve instant powdering dispersion, rapid melting, and form a cross - linked network similar to "dandelion puffing" under the action of aggregate shear and high temperature, thus exerting the SBS modification effect.

[0036] Furthermore, the mixing agent comprises resin and sodium rosinate in a weight ratio of (24 - 26):(1 - 2).

[0037] In the mixing agent used in the present application, sodium rosinate has an amphiphilic structure, with one end being a hydrophilic group and the other end being a lipophilic group. It has good chemical stability, better high - temperature and high - pressure resistance performance, and is suitable for warm - mix asphalt use; it can be used in combination with a resin with a viscosity - increasing effect as a mixing agent.

[0038] The inventors of the present application found that during the mixing process, the two components in the mixing agent produce a foaming effect in the binder, causing the asphalt to foam, reducing the high - temperature viscosity of the asphalt, and thus enabling the asphalt to be evenly mixed with other materials at a relatively low temperature (130 - 150 °C). Therefore, the present application uses resin and sodium rosinate as the mixing agent, so that the foaming reaction in the binder acts as a lubricant, achieving a warm - mix effect, and further enabling the modified regenerant to be mixed with old asphalt mixtures and new asphalt at a low temperature of 130 - 150 °C; at the same time, this mixing agent, together with the SBS modifier, stabilizer, and component regulator as the modified regenerant, has good compatibility with old asphalt mixtures and new asphalt, which is beneficial to further improving the water stability of the regenerated asphalt, thereby increasing the service life of the asphalt.

[0039] In a specific embodiment, the weight ratio of the resin to the sodium rosinate is 22:1, 22:2, 22:3, 24:1, 24:2, 24:3, 26:1, 26:2, 26:3, 28:1, 28:2, 28:3.

[0040] In some specific embodiments, the weight ratio of the resin to the sodium rosinate may also be 22:(1 - 2), 22:(2 - 3), 22:(1 - 3), 24:(1 - 2), 24:(2 - 3), 24:(1 - 3), 26:(1 - 2), 26:(2 - 3), 26:(1 - 3), 28:(1 - 2), 28:(2 - 3), 28:(1 - 3).

[0041] The inventors of the present application have analyzed through experiments and found that when the resin and the rosin resin with the above weight ratios are selected as the admixture, the comprehensive performance of the recycled asphalt can be further improved while ensuring that the mixing temperature is 130 - 150°C.

[0042] Further, the resin is selected from one or more of coumarone resin, terpene resin, C5 petroleum resin, and C9 petroleum resin.

[0043] Preferably, the stabilizer includes naphthenic oil and furfural extract oil.

[0044] Further, the stabilizer includes naphthenic oil and furfural extract oil with a weight ratio of (6 - 9):(1 - 3).

[0045] Preferably, the stabilizer is selected from one or more of petroleum asphalt, waste lubricating oil, catalytic cracking slurry, bio - extracted oil, furfural extract oil, atmospheric and vacuum distillation side - stream oil, and naphthenic oil.

[0046] The stabilizer selected in the present application can improve the compatibility of each raw material component in the modified regenerant, better enhance the adhesion of each component in the modified regenerant, reduce the void ratio of the mixed material, and then improve the immersion residual stability and freeze - thaw splitting strength ratio of the recycled asphalt, making the water stability of the recycled asphalt better.

[0047] Preferably, the stabilizer includes naphthenic oil and furfural extract oil.

[0048] Further, the stabilizer includes naphthenic oil and furfural extract oil with a weight ratio of (6 - 9):(1 - 3).

[0049] In a second aspect, the present application provides a method for preparing the above - mentioned modified regenerant, which specifically includes the following steps:

[0050] Under the condition of 140 - 160 °C, fully mix the SBS modifier, the mixing agent and the component regulator, and stir at a speed of 150 - 250 r / min for 30 - 40 min;

[0051] Add the stabilizer to the reaction system and stir to mix well to obtain the modified regenerant.

[0052] Thirdly, the present application provides the application of the above-mentioned modified regenerant in in-situ hot recycling treatment of asphalt.

[0053] Fourthly, the present application provides a method for using the above-mentioned modified regenerant in in-situ hot recycling treatment of asphalt, which specifically includes the following steps:

[0054] Under the condition of a mixing temperature of 130 - 150 °C, stir the waste asphalt mixture, the modified regenerant and the new asphalt for 10 - 20 s.

[0055] Preferably, the weight ratio of the waste asphalt mixture, the modified regenerant and the new asphalt is (80 - 100) : (8 - 12) : (8 - 12).

[0056] Through the above-mentioned method of use, the present application uses the modified regenerant in the in-situ hot recycling treatment of waste asphalt mixture. Under the condition of a low temperature of 130 - 150 °C, the modified regenerant is further blended with the old asphalt material and the new asphalt material, and each component can undergo high-degree crosslinking to generate a strong binding force, so that the obtained recycled asphalt mixture is tightly combined, further improving the performance of the recycled asphalt.

[0057] In summary, the technical solution of the present application has the following effects:

[0058] The present application uses pentaerythritol tris(3-aziridinyl) propionate, amino-terminated hyperbranched polyamide, glycerol monostearate, and fatty alcohol polyoxyethylene ether as component regulators, which cooperate synergistically with the SBS modifier, the mixing agent, and the stabilizer. The modified regenerant obtained by using this technical solution can be used in the thermal recycling treatment technology of asphalt, and the modified regenerant can be used under the working condition of a low temperature of about 140 °C.

[0059] In the preparation process of the component regulator, by controlling the feeding order and the process temperature, the components in the component regulator can form particles with small particle size and uniform distribution, which is beneficial to further improving the crosslinking property between the components in the modified regenerant, thereby further improving the overall quality of the recycled asphalt mixture.

[0060] The modified regenerant provided by this application can play the roles of component adjustment and mechanical enhancement during the short-time mixing process, so as to simultaneously restore the aged asphalt and the aged SBS modifier, and obtain a regenerated asphalt with excellent properties such as high-temperature rutting resistance, low-temperature cracking resistance, water damage resistance, and fatigue resistance.

[0061] By screening the weight ratios of the components in the component regulator, the weight ratios of the components in the mixing agent, and the types of stabilizers, the obtained modified regenerant is used in the in-situ thermal regeneration treatment of asphalt, which can further improve the performance of the regenerated asphalt. Detailed implementation manners

[0062] In the first aspect, this application provides a modified regenerant, which includes the following components in parts by weight: 45-55 parts of SBS modifier, 22-28 parts of mixing agent, 16-24 parts of stabilizer, and 14-20 parts of component regulator;

[0063] The component regulator includes pentaerythritol tris(3-aziridinyl) propionate, terminal amino hyperbranched polyamide, glycerol monostearate, and fatty alcohol polyoxyethylene ether with a weight ratio of (8-13):(2-5):(1-4):(1-3);

[0064] The mixing agent includes resin and sodium rosinate with a weight ratio of (22-28):(1-3).

[0065] Specifically, the component regulator includes pentaerythritol tris(3-aziridinyl) propionate, terminal amino hyperbranched polyamide, glycerol monostearate, and fatty alcohol polyoxyethylene ether with a weight ratio of (11-13):(2-4):(1-3):(1-2).

[0066] The preparation method of the component regulator is: weigh the corresponding weights of pentaerythritol tris(3-aziridinyl) propionate, glycerol monostearate, and fatty alcohol polyoxyethylene ether, and place them under the condition of 140-160 °C for sufficient mixing;

[0067] Then add the terminal amino hyperbranched polyamide to the reaction system, while adding, raise the temperature of the reaction system to 200-240 °C, and at the same time continuously stir for 20-30 min, then cool down to 140-160 °C and keep the temperature unchanged to obtain the component regulator for standby.

[0068] Furthermore, the temperature for raising the temperature of the reaction system is 210-230 °C.

[0069] Among them, the SBS modifier is produced by Guolu High-Tech Engineering Technology Research Institute Co., Ltd.; the melt index of the SBS modifier is 4 g / 10 min, and the particle size is 50-150 μm.

[0070] Further, the admixture includes resin and sodium rosinate with a weight ratio of (24 - 26):(1 - 2).

[0071] Specifically, the resin is selected from one or more of coumarone resin, terpene resin, C5 petroleum resin, and C9 petroleum resin.

[0072] Meanwhile, the stabilizer is selected from one or more of petroleum asphalt, waste lubricating oil, catalytic cracking slurry, bio - extracted oil, furfural extract oil, atmospheric and vacuum distillation side - stream oil, and naphthenic oil.

[0073] Further, the stabilizer includes naphthenic oil and furfural extract oil with a weight ratio of (6 - 9):(1 - 3).

[0074] In a second aspect, the present application provides a preparation method of the above - mentioned modified regenerant, specifically including the following steps:

[0075] Under the condition of 140 - 160 °C, the SBS modifier, the admixture and the component regulator are fully mixed and stirred at a speed of 150 - 250 r / min for 30 - 40 min;

[0076] The stabilizer is added to the reaction system and stirred to be fully mixed, thus obtaining the modified regenerant.

[0077] In a third aspect, the present application provides the application of the above - mentioned modified regenerant in in - situ hot recycling treatment of asphalt.

[0078] In a fourth aspect, the present application provides a usage method of the above - mentioned modified regenerant in in - situ hot recycling treatment of asphalt, specifically including the following steps:

[0079] Under the condition of a mixing temperature of 130 - 150 °C, the waste asphalt mixture, the modified regenerant and the new asphalt are stirred for 10 - 20 s.

[0080] Among them, the weight ratio of the waste asphalt mixture, the modified regenerant and the new asphalt is (80 - 100):(8 - 12):(8 - 12).

[0081] The following further describes the present application in detail with reference to examples, comparative examples and performance detection tests. These examples should not be construed as limiting the scope claimed by the present application. It should be noted that the experimental methods used in the following examples are all conventional methods unless otherwise specified. The materials, reagents, etc. used in the following examples can all be obtained from commercial channels unless otherwise specified.

[0082] The SBS modifier used in this application is produced by Guolu High-Tech Engineering Technology Research Institute Co., Ltd. (the specific preparation method is derived from the authorized patent CN 111138794 B), the amino-terminated hyperbranched polyamide is purchased from Wuhan Hyperbranched Resin Technology Co., Ltd.; the C9 petroleum resin comes from PetroChina Company, the coumarone resin comes from Lion Materials Company, and the terpene resin comes from Lanxing Chemical Company; the catalytic cracking slurry is produced by Sinopec Jinan Refining and Chemical Company, the waste lubricating oil is obtained by filtration after the Shell Helix 5-30 lubricating oil has been in use for 1 year, and the bio-extracted oil is the biomass oil extracted after the degradation of corn straw; the naphthenic oil and the atmospheric and vacuum side stream oil are produced by Karamay Petrochemical; the furfural extract oil is produced by CNOOC Binzhou Company; the new asphalt selected is 70# base asphalt, which is produced by Sinopec Qilu Company.

[0083] Preparation Example

[0084] Preparation Example 1

[0085] This preparation example provides a component regulator.

[0086] The preparation method of the component regulator in this preparation example is as follows:

[0087] Add 120 g of pentaerythritol tris(3-aziridinyl)propionate, 20 g of glycerol monostearate, and 15 g of fatty alcohol polyoxyethylene ether to a kneader, then set the temperature of the kneader to 150 °C, the rotation speed to 200 r / min, and the kneading time to 60 min; then add 30 g of amino-terminated hyperbranched polyamide (model N102, molecular weight 800 - 1000 g / mol) to the reaction system, and while adding, raise the temperature of the reaction system to 220 °C, and at the same time continuously stir for 25 min, then cool down to 150 °C and keep the temperature constant to obtain the component regulator for standby.

[0088] In this preparation example, the weight ratio of pentaerythritol tris(3-aziridinyl)propionate, amino-terminated hyperbranched polyamide (model N102, molecular weight 800 - 1000 g / mol), glycerol monostearate, and fatty alcohol polyoxyethylene ether is 12:3:2:1.5.

[0089] Preparation Example 2

[0090] This preparation example provides a component regulator.

[0091] The difference between this preparation example and Preparation Example 1 is that: the weight ratio of pentaerythritol tris(3-aziridinyl)propionate, amino-terminated hyperbranched polyamide, glycerol monostearate, and fatty alcohol polyoxyethylene ether is 11:2:1:1.

[0092] Preparation Example 3

[0093] This preparation example provides a component regulator.

[0094] The difference between this Preparation Example and Preparation Example 1 lies in that: the weight ratio of pentaerythritol tris(3-aziridinyl)propionate, amino-terminated hyperbranched polyamide, glycerol monostearate, and fatty alcohol polyoxyethylene ether is 13:3:3:2.

[0095] Preparation Example 4

[0096] This Preparation Example provides a component regulator.

[0097] The difference between this Preparation Example and Preparation Example 1 lies in that: the weight ratio of pentaerythritol tris(3-aziridinyl)propionate, amino-terminated hyperbranched polyamide, glycerol monostearate, and fatty alcohol polyoxyethylene ether is 9:5:4:1.

[0098] Preparation Example 5

[0099] This Preparation Example provides a component regulator.

[0100] The difference between this Preparation Example and Preparation Example 1 lies in that: the weight ratio of pentaerythritol tris(3-aziridinyl)propionate, amino-terminated hyperbranched polyamide, glycerol monostearate, and fatty alcohol polyoxyethylene ether is 8:2:3:3.

[0101] Preparation Example 6

[0102] This Preparation Example provides a component regulator.

[0103] The difference between this Preparation Example and Preparation Example 1 lies in that: the model of the amino-terminated hyperbranched polyamide is N101, and the molecular weight is 350 - 370 g / mol.

[0104] Preparation Example 7

[0105] This Preparation Example provides a component regulator.

[0106] The difference between this Preparation Example and Preparation Example 1 lies in that: the model of the amino-terminated hyperbranched polyamide is N103, and the molecular weight is 1900 - 2200 g / mol.

[0107] Preparation Example 8

[0108] This Preparation Example provides a component regulator.

[0109] The difference between this Preparation Example and Preparation Example 1 lies in that: the preparation method of the component regulator is as follows:

[0110] Add 120 g of pentaerythritol tris(3-aziridinyl) propionate, 20 g of glycerol monostearate, and 15 g of fatty alcohol polyoxyethylene ether to a kneader. Then set the temperature of the kneader to 150 °C, the rotation speed to 200 r / min, and the kneading time to 60 min. Then add 30 g of amino-terminated hyperbranched polyamide to the reaction system, and while adding, raise the temperature of the reaction system to 200 °C. At the same time, continuously stir for 25 min, then cool down to 150 °C and keep the temperature constant to obtain a component regulator for standby.

[0111] Preparation Example 9

[0112] This preparation example provides a component regulator.

[0113] The difference between this preparation example and Preparation Example 1 is as follows: Add 120 g of pentaerythritol tris(3-aziridinyl) propionate, 20 g of glycerol monostearate, and 15 g of fatty alcohol polyoxyethylene ether to a kneader. Then set the temperature of the kneader to 150 °C, the rotation speed to 200 r / min, and the kneading time to 60 min. Then add 30 g of amino-terminated hyperbranched polyamide to the reaction system, and while adding, raise the temperature of the reaction system to 240 °C. At the same time, continuously stir for 25 min, then cool down to 150 °C and keep the temperature constant to obtain a component regulator for standby.

[0114] Preparation Example 10

[0115] This preparation example provides a component regulator.

[0116] The difference between this preparation example and Preparation Example 1 is that the preparation method of the component regulator is as follows:

[0117] Add 120 g of pentaerythritol tris(3-aziridinyl) propionate, 20 g of glycerol monostearate, and 15 g of fatty alcohol polyoxyethylene ether to a kneader. Then set the temperature of the kneader to 150 °C, the rotation speed to 200 r / min, and the kneading time to 60 min. Then add 30 g of amino-terminated hyperbranched polyamide to the reaction system, and at the same time, continuously stir for 25 min and keep the temperature constant to obtain a component regulator for standby.

[0118] Preparation Example 11

[0119] This preparation example provides a component regulator.

[0120] The difference between this preparation example and Preparation Example 1 is that the preparation method of the component regulator is as follows:

[0121] Add 120 g of pentaerythritol tris(3-aziridinyl) propionate, 20 g of glycerol monostearate, 15 g of fatty alcohol polyoxyethylene ether, and 30 g of amino-terminated hyperbranched polyamide into a mixer simultaneously. Then set the temperature of the mixer to 150 °C, the rotation speed to 200 r / min, and the mixing time to 60 min. Then raise the temperature of the reaction system to 200 °C, and continuously stir for 25 min. Then cool down to 150 °C and keep the temperature constant to obtain the component regulator for standby.

[0122] Preparation Example 12

[0123] This preparation example provides a component regulator.

[0124] The difference between this preparation example and Preparation Example 1 is that amino-terminated hyperbranched polyamide is not added.

[0125] Preparation Example 13

[0126] This preparation example provides a component regulator.

[0127] The difference between this preparation example and Preparation Example 1 is that fatty alcohol polyoxyethylene ether is not added.

[0128] Preparation Example 14

[0129] This preparation example provides a component regulator.

[0130] The difference between this preparation example and Preparation Example 1 is that glycerol monostearate is not added.

[0131] Examples

[0132] Example 1

[0133] Example 1 provides a modified regenerant.

[0134] The preparation method of the modified regenerant in this example is as follows:

[0135] Under the condition of 155 °C, fully mix 50 g of SBS modifier, 25 g of blending agent, and 17 g of component regulator, and stir at a rotation speed of 200 r / min for 35 min. Among them, the blending agent is a coumarone resin and sodium rosinate with a weight ratio of 26:1.

[0136] Add 20 g of stabilizer to the reaction system, stir and mix well to obtain the modified regenerant. Among them, the stabilizer is naphthenic oil and furfural extract oil with a weight ratio of 7:2.

[0137] Example 2

[0138] This example provides a modified regenerant.

[0139] The difference between this embodiment and Embodiment 1 is that the addition amount of the component regulator is 14 g.

[0140] Embodiment 3

[0141] This embodiment provides a modified regenerant.

[0142] The difference between this embodiment and Embodiment 1 is that the addition amount of the component regulator is 20 g.

[0143] Embodiments 4 - 13

[0144] Embodiments 4 - 13 respectively provide a modified regenerant.

[0145] The difference between the above embodiments and Embodiment 1 is that the sources of the component regulator are different, as shown in Table 1 specifically.

[0146] Table 1 Sources of the component regulator in Embodiment 1 and Embodiments 4 - 13

[0147]

[0148] Embodiment 14

[0149] This embodiment provides a modified regenerant.

[0150] The difference between this embodiment and Embodiment 1 is that the stabilizer is naphthenic oil and furfural extract oil with a weight ratio of 6:1.

[0151] Embodiment 15

[0152] This embodiment provides a modified regenerant.

[0153] The difference between this embodiment and Embodiment 1 is that the stabilizer is naphthenic oil and furfural extract oil with a weight ratio of 9:3.

[0154] Embodiment 16

[0155] This embodiment provides a modified regenerant.

[0156] The difference between this embodiment and Embodiment 1 is that the mixing agent is coumarone resin and sodium rosinate with a weight ratio of 24:2.

[0157] Embodiment 17

[0158] This embodiment provides a modified regenerant.

[0159] The difference between this embodiment and Embodiment 1 is that the mixing agent is coumarone resin and sodium rosinate with a weight ratio of 24:1.

[0160] Embodiment 18

[0161] This embodiment provides a modified regenerant.

[0162] The difference between this embodiment and Embodiment 1 is that the blending agent is coumarone resin and sodium rosinate with a weight ratio of 28:1.

[0163] Embodiment 19

[0164] This embodiment provides a modified regenerant.

[0165] The difference between this embodiment and Embodiment 1 is that the blending agent is coumarone resin and sodium rosinate with a weight ratio of 22:3.

[0166] Comparative example

[0167] Comparative example 1

[0168] This comparative example provides a modified regenerant.

[0169] The difference between this comparative example and Embodiment 1 is that the dosage of the component regulator is 12 g.

[0170] Comparative example 2

[0171] This comparative example provides a modified regenerant.

[0172] The difference between this comparative example and Embodiment 1 is that the component regulator is derived from Preparation Example 12.

[0173] Comparative example 3

[0174] This comparative example provides a modified regenerant.

[0175] The difference between this comparative example and Embodiment 1 is that the component regulator is derived from Preparation Example 13.

[0176] Comparative example 4

[0177] This comparative example provides a modified regenerant.

[0178] The difference between this comparative example and Embodiment 1 is that the component regulator is derived from Preparation Example 14.

[0179] Comparative example 5

[0180] This comparative example provides a modified regenerant.

[0181] The difference between this comparative example and Embodiment 1 is that no blending agent is added.

[0182] The preparation method of the modified regenerant in this embodiment is as follows:

[0183] Under the condition of 155 °C, 50 g of SBS modifier and 17 g of component regulator are fully mixed and stirred at a speed of 200 r / min for 35 min.

[0184] 20 g of stabilizer is added to the reaction system and stirred thoroughly to obtain the modified regenerant; among them, the stabilizer is naphthenic oil and furfural extract oil with a weight ratio of 7:2.

[0185] Comparative Example 6

[0186] This comparative example provides a modified regenerant.

[0187] The difference between this comparative example and Example 1 is that the mixing agent is coumarone resin.

[0188] The preparation method of the modified regenerant in this example is as follows:

[0189] Under the condition of 155 °C, 50 g of SBS modifier and 25 g of coumarone resin as the mixing agent are fully mixed with 17 g of component regulator and stirred at a speed of 200 r / min for 35 min.

[0190] 20 g of stabilizer is added to the reaction system and stirred thoroughly to obtain the modified regenerant; among them, the stabilizer is naphthenic oil and furfural extract oil with a weight ratio of 7:2.

[0191] Application Example

[0192] The modified regenerants prepared in Examples 1 - 19 and Comparative Examples 1 - 6 in this application example are used for in-situ thermal regeneration treatment of asphalt, which specifically includes the following steps:

[0193] Under the condition of a mixing temperature of 140 °C, the waste asphalt mixture, the modified regenerant and the new asphalt (I-D SBS modified asphalt) are stirred for 15 s; among them, the dosage of the modified regenerant is 15% of the mass of the old asphalt in the waste asphalt mixture, and the new asphalt is 1% of the dosage of the new asphalt mixture, to obtain the modified asphalt mixture.

[0194] Performance Test Results

[0195] The materials after in-situ thermal regeneration treatment of asphalt in the application example are formed into specimens, cured and tested for performance in accordance with the "Test Procedures for Bitumen and Bituminous Mixtures for Highway Engineering" (JTG E20 - 2011).

[0196] Meanwhile, without adding the modified regenerant, at a mixing temperature of 140°C, waste asphalt mixture was mixed with new asphalt (I-D SBS modified asphalt) and a market-regular regenerant (LURA asphalt regenerant, purchased from Jiangsu Jieke Ludeke Technology Development Co., Ltd.) and stirred for 15 s; among them, the dosage of the modified regenerant was 15% of the mass of the old asphalt in the waste asphalt mixture, and the new asphalt was 1% of the dosage of the new asphalt mixture, to obtain in-situ hot recycled asphalt mixture, which was used as Comparative Example 1. The newly mixed mixture of SBS modified asphalt was used as Comparative Example 2.

[0197] Test results: As shown in Table 2.

[0198] Table 2 Performance of the modified asphalt mixtures obtained after the application of Examples 1-19 and Comparative Examples 1-6

[0199]

[0200]

[0201] Combined with the test results in Table 2, by comparing the test results of Examples 1-19 with those of Comparative Examples 1-6 and Comparative Examples 1-2, Comparative Example 1 used a market-regular regenerant, which mainly fully dissolved and dispersed the asphaltenes in the aged asphalt and adjusted the proportion of each component of the aged asphalt, so as to improve the performance of the aged asphalt. Although newly obtained I-D SBS modified asphalt was added, due to the low actual content of SBS, the improvement in its various performances was limited. In this application, pentaerythritol tris(3-aziridinyl) propionate, terminal amino hyperbranched polyamide, glycerol monostearate, and fatty alcohol polyoxyethylene ether with a weight ratio of (8-13):(2-5):(1-4):(1-3) were used as component regulators, which were synergistically combined with the SBS modifier, mixer, and stabilizer to prepare a modified regenerant. When the modified regenerant provided in this application was used in the in-situ hot recycling treatment technology of asphalt, it could play the roles of component adjustment (simultaneously restoring the aged asphalt and supplementing and restoring the aged SBS modifier) and mechanical enhancement during the short mixing process. The laid recycled asphalt pavement had significant improvements in high-temperature rutting resistance, low-temperature cracking resistance, water damage resistance, fatigue resistance, etc., and could be comparable to the performance of the new asphalt mixture (Comparative Example 2), and could meet the requirements of low-temperature mixing, and could be used under the working condition with a mixing temperature of only 140°C.

[0202] By comparing the test results of Examples 1-3 with those of Comparative Example 1, when the addition amount of the component regulator in this application was controlled to be 14-20 parts, the prepared modified regenerant could significantly improve the comprehensive performance of the recycled asphalt. Therefore, the addition amount of the component regulator in this application was controlled within the above range.

[0203] By comparing the test results of Example 1 with Comparative Examples 2-4, when only any three of pentaerythritol tris(3-aziridinyl)propionate, amino-terminated hyperbranched polyamide, glycerol monostearate, and fatty alcohol polyoxyethylene ether are selected as component regulators, the binding strength of the component regulators is weak and the structural stability is insufficient, resulting in poor comprehensive performance of the prepared modified regenerant when used for recycled asphalt. Therefore, this application selects to use pentaerythritol tris(3-aziridinyl)propionate, amino-terminated hyperbranched polyamide, glycerol monostearate, and fatty alcohol polyoxyethylene ether as component regulators simultaneously.

[0204] Meanwhile, by comparing the test results of Example 1 with Examples 4-7, when the weight ratio of pentaerythritol tris(3-aziridinyl)propionate, amino-terminated hyperbranched polyamide, glycerol monostearate, and fatty alcohol polyoxyethylene ether is controlled to be (8-13):(2-5):(1-4):(1-3), the comprehensive performance of recycled asphalt can be further improved.

[0205] By comparing the test results of Example 1 with Examples 8-9, when the molecular weight of the amino-terminated hyperbranched polyamide is 500-1500 g / mol, the comprehensive performance of recycled asphalt can be further improved.

[0206] By comparing the test results of Example 1 with Examples 12-13, during the preparation process of the component regulator, when the temperature of the reaction system is kept constant at 140-160 °C all the time or pentaerythritol tris(3-aziridinyl)propionate, glycerol monostearate, fatty alcohol polyoxyethylene ether, and amino-terminated hyperbranched polyamide are added to the reaction system simultaneously, the comprehensive performance of the prepared modified regenerant when used for recycled asphalt is poor; while this application selects to first place pentaerythritol tris(3-aziridinyl)propionate, glycerol monostearate, and fatty alcohol polyoxyethylene ether under the condition of 140-160 °C for sufficient mixing; then add amino-terminated hyperbranched polyamide, and raise the temperature to 200-240 °C, and then cool down to 140-160 °C, the comprehensive performance of the obtained modified regenerant when used for recycled asphalt can be further improved.

[0207] Meanwhile, by comparing the test results of Example 1 with Examples 10-11, this application controls the heating temperature to 210-230 °C, which can further improve the comprehensive performance of recycled asphalt.

[0208] By comparing the test results of Example 1 with Comparative Examples 5-6, when there is no mixing agent added to the modified regenerant or only resin is used as the mixing agent, under the condition of a mixing temperature of 140 °C, the mixing effect with the waste asphalt mixture and the new asphalt is poor, the binding strength is weak, and the structural stability is insufficient, resulting in poor comprehensive performance of the prepared modified regenerant when used for recycled asphalt.

[0209] By comparing the test results of Example 1 with those of Examples 16-19, when using resin and sodium rosinate with a ratio of 28:1 as the mixing agent, or using resin and sodium rosinate with a weight ratio of 22:3 as the mixing agent, when the prepared modified regenerant is used for regenerating asphalt, the immersion residual stability and freeze-thaw splitting strength of the regenerated asphalt are relatively poor, indicating that the water stability of the regenerated asphalt is poor; while in this application, when choosing resin and sodium rosinate with a weight ratio of (24-26):(1-2) as the mixing agent, when the prepared modified regenerant is used for regenerating asphalt, a regenerated asphalt with better water stability can be obtained.

[0210] At the same time, by comparing the test results of Example 1 with those of Examples 14-15, when using naphthenic oil and furfural extract oil with a weight ratio of (6-9):(1-3) as the stabilizer, when the prepared modified regenerant is used for regenerating asphalt, the water stability of the regenerated asphalt can be further improved, which is beneficial to improving the service life of the regenerated asphalt.

[0211] Although the present invention has been described in detail with general descriptions and specific embodiments above, based on the present invention, some modifications or improvements can be made, which are obvious to those skilled in the art. Therefore, these modifications or improvements made without departing from the spirit of the present invention all fall within the scope of protection required by the present invention.

Claims

1. A modified regenerant, characterized in that, It comprises the following components in parts by weight: 45 - 55 parts of SBS modifier, 22 - 28 parts of mixing agent, 16 - 24 parts of stabilizer, and 14 - 20 parts of component regulator; The component regulator comprises pentaerythritol tris(3-aziridinyl) propionate, amino-terminated hyperbranched polyamide, glycerol monostearate, and fatty alcohol polyoxyethylene ether in a weight ratio of (8 - 13):(2 - 5):(1 - 4):(1 - 3); The mixing agent comprises resin and sodium rosinate in a weight ratio of (22 - 28):(1 - 3); The resin is selected from one or more of coumarone resin, terpene resin, C5 petroleum resin, and C9 petroleum resin.

2. The modified regenerant according to claim 1, wherein, The component regulator comprises pentaerythritol tris(3-aziridinyl) propionate, amino-terminated hyperbranched polyamide, glycerol monostearate, and fatty alcohol polyoxyethylene ether in a weight ratio of (11 - 13):(2 - 4):(1 - 3):(1 - 2); 3. The modified regenerant according to claim 1, wherein, The preparation method of the component regulator is as follows: Weigh the corresponding weights of pentaerythritol tris(3-aziridinyl) propionate, glycerol monostearate, and fatty alcohol polyoxyethylene ether, and place them under the condition of 140 - 160 °C for sufficient mixing; Then add the amino-terminated hyperbranched polyamide into the reaction system, while adding, raise the temperature of the reaction system to 200 - 240 °C, and at the same time continuously stir for 20 - 30 min, then cool down to 140 - 160 °C and keep the temperature constant to obtain the component regulator for standby.

4. The modified regenerant according to claim 1, wherein The mixing agent comprises resin and sodium rosinate in a weight ratio of (24 - 26):(1 - 2); 5. The modified regenerant according to claim 1, wherein, The stabilizer is selected from one or more of petroleum asphalt, waste lubricating oil, catalytic cracking slurry, bio-extracted oil, furfural extract oil, atmospheric and vacuum distillation side stream oil, and naphthenic oil.

6. The modified regenerant according to claim 5, wherein, The stabilizer comprises naphthenic oil and furfural extract oil.

7. The modified regenerant according to claim 6, wherein The stabilizer comprises naphthenic oil and furfural extract oil in a weight ratio of (6 - 9):(1 - 3).

8. The preparation method of the modified regenerant according to any one of claims 1-7, characterized in that, Specifically, it comprises the following steps: Under the condition of 140 - 160 °C, fully mix the SBS modifier, the mixing agent, and the component regulator, and stir at a speed of 150 - 250 r / min for 30 - 40 min; Add the stabilizer to the reaction system and stir for sufficient mixing to obtain the modified regenerant.

9. The application of the modified regenerant according to any one of claims 1 - 7 in in-situ thermal regeneration treatment of asphalt.

10. A method for using the modified regenerant as described in any one of claims 1-7 in in-situ hot recycling treatment of asphalt, characterized in that, Specifically, it comprises the following steps: Under the condition of a mixing temperature of 130 - 150 °C, stir the waste asphalt mixture, the modified regenerant, and the new asphalt for 10 - 20 s.

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