A green, environmentally friendly, aging-resistant warm-mix asphalt regeneration agent and preparation method thereof

Abstract

The invention discloses a green, environmentally friendly, anti-aging warm-mix asphalt regeneration agent, which comprises the following components by weight: 70-80 parts of modified vegetable oil, 10-15 parts of anti-aging enhancer, 5-10 parts of viscosity reducer and 3-5 parts of stabilizer. The invention also discloses a preparation method of the green, environmentally friendly, anti-aging warm-mix asphalt regeneration agent. The regeneration agent provided by the invention adopts vegetable oil as a base oil component and triethyl phosphate as a penetrant, which works in synergy with the base oil component to reduce the contact points between asphaltene and restore the chemical components and structure of asphalt; and then introduces titanium dioxide modified carbon nanotube particles into the system, and cooperates with triethyl phosphate penetrant, so that the regenerated asphalt has strong anti-aging performance, the performance of old asphalt is better restored, and the solubilization effect is obvious. At the same time, through the divalent acid ester viscosity reducer, the prepared regenerated asphalt mixture has obvious cooling effect, and the road performance reaches the level of new asphalt mixture.

Description

Technical Field

[0001] The invention belongs to the technical field of road asphalt regeneration, and specifically relates to a green, environmentally friendly, aging-resistant warm-mix asphalt regeneration agent and a preparation method thereof. Background Art

[0002] As the mileage of my country's highways increases, asphalt pavements tend to age due to the influence of natural environments such as vehicle loads and precipitation. The driving comfort and anti-skid performance of the pavement will decline to varying degrees, affecting the comprehensive performance of the pavement. This requires preventive maintenance and repair measures. In recent years, with the rapid development of my country's highway construction and the need for renovation and reconstruction of a large number of high-grade highway asphalt pavements, the maintenance and recycling of old asphalt pavement materials have regained attention and widespread concern.

[0003] The maintenance method of asphalt pavement defects mostly adopts milling and paving technology, which produces a large amount of waste materials, which wastes resources, occupies land and pollutes the environment; asphalt pavement regeneration technology can reuse waste asphalt mixture, thereby saving resources such as asphalt, sand and gravel, reducing project costs, and protecting arable land and water sources, which is consistent with the basic national policy of saving resources and protecting the environment and the requirements of the sustainable development strategy. Among them, factory-mixed hot regeneration technology is the most widely used, most mature and best road performance asphalt pavement regeneration technology. It generally uses high-position rollers for heating. The heating temperature is generally heated to 200°C, which causes the asphalt to age again, affecting the performance of the recycled mixture, and the energy consumption is large, the pollution is large, and it does not meet the requirements of a low-carbon circular economy. At the same time, there are still many problems with asphalt regeneration agents, such as poor anti-aging performance and poor permeability, which leads to the inability to increase the amount of old milling materials in asphalt pavements. At the same time, the durability and water damage resistance of the recycled asphalt pavement are insufficient, and various early diseases occur before the service life is reached. Summary of the invention

[0004] The present invention aims to solve one of the technical problems in the related art at least to a certain extent. To this end, the main purpose of the present invention is to provide a green, environmentally friendly, aging-resistant warm mix asphalt regeneration agent and a preparation method thereof.

[0005] The objective of the present invention is achieved through the following technical solutions:

[0006] A green, environmentally friendly, aging-resistant warm-mix asphalt regeneration agent comprises the following components in parts by weight: 70-80 parts of modified vegetable oil, 10-15 parts of anti-aging enhancer, 5-10 parts of viscosity reducer and 3-5 parts of stabilizer.

[0007] Preferably, the following components are included in parts by weight: 70 parts of modified vegetable oil, 10 parts of anti-aging enhancer, 10 parts of viscosity reducer and 4 parts of stabilizer.

[0008] Preferably, the following components are included in parts by weight: 76 parts of modified vegetable oil, 13 parts of anti-aging enhancer, 7 parts of viscosity reducer and 4 parts of stabilizer.

[0009] Preferably, the following components are included in parts by weight: 80 parts of modified vegetable oil, 15 parts of anti-aging enhancer, 5 parts of viscosity reducer and 3 parts of stabilizer.

[0010] In some specific embodiments, the modified vegetable oil is prepared by the following method: by weight, 80-90 parts of vegetable oil are dehydrated at 100-140° C., 10-15 parts of plasticizer dibutyl phthalate are added, the temperature is maintained at 100-140° C. and stirred at a speed of 3000-4000 r / min for 25-40 minutes to form a uniform liquid, thereby obtaining the modified vegetable oil.

[0011] In some specific embodiments, the anti-aging enhancer is prepared by the following method: by weight, 20-30 parts of titanium dioxide modified carbon nanotubes and 5-10 parts of surfactants are added to 70-80 parts of penetrant triethyl phosphate, and ultrasonically dispersed for 25-35 minutes to obtain the anti-aging enhancer.

[0012] Furthermore, the titanium dioxide modified carbon nanotubes are prepared by the following method:

[0013] 1) stirring the carbon nanotubes in a mixed acid to react, thereby obtaining acidified carbon nanotubes;

[0014] 2) Weighing the acidified carbon nanotubes, adding ethanol and a small amount of nitric acid, ultrasonically dispersing for 15-25 minutes, then adding butyl titanate, stirring for 25-40 minutes, and finally adding ethanol and distilled water, ultrasonically stirring for 25-40 minutes to obtain a mixed solution;

[0015] 3) The mixed solution is transferred to a hydrothermal reactor, heated to 140-160° C. under magnetic stirring, maintained for 8-10 hours, taken out, washed by centrifugation with anhydrous ethanol and distilled water, dried and ground to obtain titanium dioxide modified carbon nanotubes.

[0016] In some specific embodiments, the mixed acid is concentrated sulfuric acid and concentrated nitric acid in a volume ratio of 3:1.

[0017] In some specific embodiments, the vegetable oil is one or more of castor oil, epoxidized soybean oil and palm oil; the viscosity reducer is a divalent acid ester; and the stabilizer is sulfur.

[0018] A preparation method of the aforementioned green, environmentally friendly, aging-resistant warm-mix asphalt regeneration agent comprises the following steps: in parts by weight, 70-80 parts of modified vegetable oil, 10-15 parts of anti-aging enhancer, and 5-10 parts of viscosity reducer are stirred at 70-90°C and at a speed of 3000-4000 r / min for 50-70 minutes to form a uniform liquid, and finally 3-5 parts of stabilizer are added, stirred and mixed evenly, and then cooled to room temperature to obtain a black, transparent, viscous asphalt regeneration agent.

[0019] Compared with the prior art, the present invention has at least the following advantages:

[0020] The green, environmentally friendly, aging-resistant warm-mix asphalt regeneration agent provided by the present invention adopts vegetable oil (castor oil, epoxidized soybean oil, palm oil) as the base oil to supplement the light components of aged asphalt, soften the aged asphalt, and thus restore the penetration and ductility of the asphalt; triethyl phosphate is used as a penetrant to work in synergy with the base oil, thereby more effectively introducing the base oil into the aged asphalt, reducing the contact points between asphaltenes, facilitating the movement between asphaltenes, and restoring the chemical components and structure of the asphalt; and titanium dioxide-modified carbon nanotube particles are introduced into the system in coordination with the triethyl phosphate penetrant and the dibasic acid ester viscosity reducer, so that the regenerated asphalt has strong anti-aging properties, the performance of the old asphalt is better restored, and the solubilization effect is obvious. At the same time, by adding the dibasic acid ester viscosity reducer, the prepared regenerated asphalt mixture has a significant cooling effect in coordination with other components, and the road performance reaches the level of a new asphalt mixture. DETAILED DESCRIPTION

[0021] The present invention will be further described in detail below in conjunction with specific embodiments. The following embodiments are only illustrative and not restrictive, and the protection scope of the present invention cannot be limited thereto.

[0022] When a certain amount, concentration or other value or parameter is expressed in the form of a range, a preferred range, or a preferred upper and lower numerical limit, it should be understood that it is equivalent to specifically revealing any range by combining any pair of upper range limits or preferred numerical values ​​with any lower range limit or preferred numerical value, regardless of whether the range is specifically disclosed. Unless otherwise indicated, the numerical range values ​​listed herein include the endpoints of the range, and all integers and fractions within the range.

[0023] Unless otherwise indicated, all percentages, parts, ratios, etc. herein are by weight.

[0024] The materials, methods, and examples herein are illustrative and are not to be construed as limiting unless specifically stated.

[0025] In the following examples, the nanotubes used are multi-arm carbon nanotubes, which are black powder solids in appearance, with a purity of >95%, a tube diameter of 7-15 nm, a tube length of 10-20 nm, and a density of 1.7 g / mL (25° C.).

[0026] The titanium dioxide modified carbon nanotubes used are prepared by the following method:

[0027] The acidified carbon nanotubes are obtained; S2) the acidified carbon nanotubes are weighed, ethanol and a small amount of nitric acid are added, ultrasonic dispersion is performed for 20 minutes, and then butyl titanate is added, stirring is performed for 30 minutes, and finally ethanol and distilled water are added, ultrasonic stirring is performed for 25-40 minutes to obtain a mixed solution; S3) the mixed solution is transferred to a hydrothermal reactor, heated to 150°C under magnetic stirring, maintained for 9 hours, then taken out, washed by centrifugation with anhydrous ethanol and distilled water, and dried and ground to obtain titanium dioxide modified carbon nanotubes.

[0028] In the following examples, the regeneration agent test method was carried out in accordance with T0619 and T0618 regulations, and the regenerated asphalt test method was carried out in accordance with the "Testing Procedures for Asphalt and Asphalt Mixtures in Highway Engineering" (JTG E20-2011);

[0029] Example 1

[0030] The preparation method of the green, environmentally friendly, aging-resistant warm-mix asphalt regeneration agent provided by the present invention specifically comprises the following steps:

[0031] 1) Preparation of modified vegetable oil

[0032] In parts by weight, 84 parts of castor oil were dehydrated at 120° C., and then 12 parts of plasticizer dibutyl phthalate were added, and the temperature was maintained at 120° C. and stirred at a speed of 3500 r / min for 30 minutes to form a uniform liquid, thereby obtaining a modified vegetable oil;

[0033] 2) Preparation of anti-aging enhancer

[0034] In parts by weight, 25 parts of titanium dioxide modified carbon nanotubes and 8 parts of surfactants were added to 74 parts of penetrant triethyl phosphate, and ultrasonically dispersed for 30 minutes to obtain an anti-aging enhancer;

[0035] 3) Preparation of asphalt regeneration agent

[0036] In parts by weight, 70 parts of modified vegetable oil, 10 parts of anti-aging enhancer, and 10 parts of viscosity reducer (divalent acid ester) are stirred at 70-90°C and 3000-4000r / min for 50-70min to form a uniform liquid. Finally, 4 parts of stabilizer (sulfur) are added, stirred and mixed evenly, and then cooled to room temperature to obtain a black, transparent, viscous asphalt regeneration agent.

[0037] Example 2

[0038] The preparation method of the green, environmentally friendly, aging-resistant warm-mix asphalt regeneration agent provided by the present invention specifically comprises the following steps:

[0039] 1) Preparation of modified vegetable oil

[0040] In parts by weight, 84 parts of castor oil were dehydrated at 120° C., and then 12 parts of a plasticizer, dibutyl phthalate, were added. The temperature was maintained at 120° C. and stirred at a speed of 3500 r / min for 30 minutes to form a uniform liquid, thereby obtaining a modified vegetable oil.

[0041] 2) Preparation of anti-aging enhancer

[0042] In parts by weight, 25 parts of titanium dioxide modified carbon nanotubes and 8 parts of surfactants were added to 74 parts of penetrant triethyl phosphate, and ultrasonically dispersed for 30 minutes to obtain an anti-aging enhancer;

[0043] 3) Preparation of asphalt regeneration agent

[0044] In parts by weight, 76 parts of modified vegetable oil, 13 parts of anti-aging enhancer, and 7 parts of viscosity reducer (divalent acid ester) were stirred at 80°C and 3500r / min for 60 minutes to form a uniform liquid. Finally, 4 parts of stabilizer (sulfur) were added, stirred and mixed evenly, and then cooled to room temperature to obtain a black, transparent, viscous asphalt regeneration agent.

[0045] Example 3

[0046] The preparation method of the green, environmentally friendly, aging-resistant warm-mix asphalt regeneration agent provided by the present invention specifically comprises the following steps:

[0047] 1) Preparation of modified vegetable oil

[0048] In parts by weight, 84 parts of castor oil were dehydrated at 120° C., and then 12 parts of a plasticizer, dibutyl phthalate, were added. The temperature was maintained at 120° C. and stirred at a speed of 3500 r / min for 30 minutes to form a uniform liquid, thereby obtaining a modified vegetable oil.

[0049] 2) Preparation of anti-aging enhancer

[0050] In parts by weight, 25 parts of titanium dioxide modified carbon nanotubes and 8 parts of surfactants were added to 74 parts of penetrant triethyl phosphate, and ultrasonically dispersed for 30 minutes to obtain an anti-aging enhancer;

[0051] 3) Preparation of asphalt regeneration agent

[0052] In parts by weight, 80 parts of modified vegetable oil, 15 parts of anti-aging enhancer, and 5 parts of viscosity reducer (divalent acid ester) are stirred at 70-90°C and 3000-4000r / min for 50-70min to form a uniform liquid. Finally, 3 parts of stabilizer (sulfur) are added, stirred and mixed evenly, and then cooled to room temperature to obtain a black, transparent, viscous asphalt regeneration agent.

[0053] Comparative Example 1

[0054] The green, environmentally friendly, aging-resistant warm-mix asphalt regeneration agent provided in this comparative example has components and proportions that are basically the same as those in Example 2, except that the titanium dioxide-modified carbon nanotubes in step 2) are replaced with carbon nanotubes that are not modified with titanium dioxide; and the process steps are the same as those in the example.

[0055] Comparative Example 2

[0056] The green, environmentally friendly, aging-resistant warm-mix asphalt regeneration agent provided in this comparative example has components and proportions that are basically the same as those in Example 2, except that no penetrant triethyl phosphate is added in step 2); its process steps are the same as those in the example.

[0057] Comparative Example 3

[0058] The green, environmentally friendly, aging-resistant warm-mix asphalt regeneration agent provided in this comparative example has components and proportions that are basically the same as those in Example 2, except that no viscosity reducer (divalent acid ester) is added in step 3); its process steps are the same as those in the example.

[0059] The present invention takes Example 2 as an example, and performs performance tests on the green, environmentally friendly, aging-resistant warm-mix asphalt regeneration agents prepared in Example 2 and Comparative Examples 1-3. The results are shown in Table 1:

[0060] Table 1 Asphalt regeneration agent obtained in each embodiment and each comparative example

[0061]

[0062] The present invention prepares regenerated asphalt with the prepared asphalt regeneration agent, specifically, the amount of the regeneration agent is 4wt% of the aged asphalt; and the prepared regenerated asphalt is tested for performance, and the results are shown in Table 2:

[0063] Table 2 Performance test of recycled asphalt mixtures prepared in various embodiments and comparative examples

[0064]

[0065] It can be seen from the data in Table 1 and Table 2 that the warm-mix asphalt regeneration agent of the present invention has strong anti-aging performance based on the titanium dioxide-modified carbon nanotubes and the penetrant effect, and the old asphalt performance is better restored, and the solubilization effect is obvious. At the same time, by adding a specific viscosity reducer, the prepared regenerated asphalt mixture has a significant cooling effect, and the road performance reaches the level of a new asphalt mixture.

[0066] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. These modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be included in the scope of the claims and specification of the present invention.

Claims

1. A green, environmentally friendly, aging-resistant warm-mix asphalt regeneration agent, characterized in that: The invention comprises the following components in parts by weight: 70-80 parts of modified vegetable oil, 10-15 parts of anti-aging enhancer, 5-10 parts of viscosity reducer and 3-5 parts of stabilizer; the anti-aging enhancer is prepared by the following method: in parts by weight, 20-30 parts of titanium dioxide modified carbon nanotubes and 5-10 parts of surfactant are added to 70-80 parts of penetrant triethyl phosphate, and the anti-aging enhancer is obtained after ultrasonic dispersion for 25-35 minutes.

2. The green, environmentally friendly, aging-resistant warm-mix asphalt regeneration agent according to claim 1, characterized in that: The composition includes the following components by weight: 70 parts of modified vegetable oil, 10 parts of anti-aging enhancer, 10 parts of viscosity reducer and 4 parts of stabilizer.

3. The green, environmentally friendly, aging-resistant warm-mix asphalt regeneration agent according to claim 1, characterized in that: The composition includes the following components in parts by weight: 76 parts of modified vegetable oil, 13 parts of anti-aging enhancer, 7 parts of viscosity reducer and 4 parts of stabilizer.

4. The green, environmentally friendly, aging-resistant warm-mix asphalt regeneration agent according to claim 1, characterized in that: The composition comprises the following components in parts by weight: 80 parts of modified vegetable oil, 15 parts of anti-aging enhancer, 5 parts of viscosity reducer and 3 parts of stabilizer.

5. The green, environmentally friendly, aging-resistant warm-mix asphalt regeneration agent according to any one of claims 1 to 4, characterized in that: The modified vegetable oil is prepared by the following method: by weight, 80-90 parts of vegetable oil are dehydrated at 100-140° C., 10-15 parts of plasticizer dibutyl phthalate are added, the temperature is maintained at 100-140° C., and the mixture is stirred at a speed of 3000-4000 r / min for 25-40 minutes to form a uniform liquid, thereby obtaining the modified vegetable oil.

6. The green, environmentally friendly, aging-resistant warm-mix asphalt regeneration agent according to claim 1, characterized in that: The titanium dioxide modified carbon nanotubes are prepared by the following method: 1) stirring carbon nanotubes in a mixed acid to react and obtain acidified carbon nanotubes; 2) Weigh the acidified carbon nanotubes, add ethanol and a small amount of nitric acid, and ultrasonically disperse for 15-25 minutes, then add butyl titanate, stir for 25-40 minutes, and finally add ethanol and distilled water, and ultrasonically stir for 25-40 minutes to obtain a mixed solution; 3) The mixed solution is transferred to a hydrothermal reactor, heated to 140-160° C. under magnetic stirring, maintained for 8-10 hours, taken out, washed by centrifugation with anhydrous ethanol and distilled water, and dried and ground to obtain titanium dioxide-modified carbon nanotubes.

7. The green, environmentally friendly, aging-resistant warm-mix asphalt regeneration agent according to claim 6, characterized in that: The mixed acid is concentrated sulfuric acid and concentrated nitric acid in a volume ratio of 3:

1.

8. The green, environmentally friendly, aging-resistant warm-mix asphalt regeneration agent according to claim 5, characterized in that: The vegetable oil is one or more of castor oil, epoxidized soybean oil and palm oil; the viscosity reducer is a divalent acid ester; and the stabilizer is sulfur.

9. A method for preparing the green, environmentally friendly, aging-resistant warm-mix asphalt regeneration agent according to any one of claims 1 to 8, characterized in that: The method comprises the following steps: according to the formula requirements, the modified vegetable oil, the anti-aging enhancer and the viscosity reducer are stirred at 70-90°C and at a speed of 3000-4000 r / min for 50-70 minutes to form a uniform liquid; finally, a stabilizer is added, the mixture is stirred and evenly mixed, and then the mixture is cooled to room temperature to obtain a black transparent viscous asphalt regeneration agent.

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