Method for shortening development of high-viscosity asphalt

Abstract

The invention belongs to the technical field of asphalt preparation, and particularly relates to a method for shortening the development of high-viscosity asphalt, which comprises the following steps: heating matrix asphalt, adding a ductility enhancer and a modifier, fully swelling, grinding the swelled mixture by a colloid mill twice, adding a segregation improver into the ground asphalt, stirring for development, and adding a stabilizer after development for 1 hour, thereby obtaining the high-viscosity asphalt. And continuously developing for 8-12 hours under a stirring condition. According to the invention, the segregation improver and the stabilizer are compounded, the swelled modifier forms crosslinking under the promotion of high temperature and the stabilizer, and through early-stage swelling, the crosslinking rate is accelerated, the development time is shortened, and the cost is saved.

Description

Technical Field

[0001] The invention belongs to the technical field of asphalt preparation, and in particular relates to a method for shortening the development of high-viscosity asphalt. Background Art

[0002] During the use of traditional asphalt pavement, due to the long-term impact of vehicle loads and environmental factors, cracks, rutting, potholes and other defects gradually appear, which seriously affects the road's traffic capacity and service life. Therefore, how to effectively extend the service life of the road and improve the performance of the road has become an urgent problem to be solved in the field of road maintenance.

[0003] In this context, ultra-thin overlay road maintenance technology came into being and quickly became an important means of preventive maintenance for high-grade highways and urban roads. Ultra-thin overlay is a kind of ultra-thin structure layer with a thickness of about 1.5cm-2.5cm, which is formed by mixing high-viscosity modified asphalt as a binder with aggregate in a certain proportion and then paved on the original road surface. This technology has the advantages of fast construction speed, environmental protection and energy saving, and improved road performance. It can significantly improve the flatness, skid resistance, and durability of the road surface, extend the service life of the road surface, and reduce maintenance costs.

[0004] However, the performance of ultra-thin overlays depends largely on the binder used - high-viscosity modified asphalt. High-viscosity modified asphalt significantly improves the high-temperature stability, low-temperature crack resistance, and water damage resistance of asphalt by adding specific modifiers, such as SBS (styrene-butadiene-styrene block copolymer) and rubber powder, so that it can better adapt to the construction requirements and use environment of ultra-thin overlays. However, due to the high dosage of high-viscosity asphalt modifiers, segregation is difficult to control, which increases the development cost.

[0005] Patent CN 104479169 A discloses a reactive SBS modified asphalt stabilizer and a preparation method thereof. The application uses catalysts, epichlorohydrin, polyethylene polyamines, chlorinated olefins, chlorinated aromatics and other additives to prepare a heat storage stabilizer and SBS modified asphalt. Although the modified asphalt prepared has good storage stability, its preparation process is complicated and time-consuming, and cannot be applied to actual rapid production; CN 117126547 A discloses an SBS polymer modified asphalt and a preparation method thereof. The patent mainly introduces the use of a promoter to modify the base asphalt, improve the reaction activity of the base asphalt, promote the reaction between the base asphalt and the modifier, shorten the development time, and improve production efficiency. This invention is only for the modification of 70# Boscan base asphalt, and has a narrow application, and does not mention high-dosage and high-viscosity asphalt.

[0006] The high-viscosity modified asphalt prepared by the existing technology takes a long time to develop and separate. By the time the separation is detected to be qualified, its ductility and aging indicators have decayed. High-viscosity asphalt is not suitable for long-term high-temperature development and storage. Summary of the invention

[0007] The object of the present invention is to provide a method for shortening the development of high-viscosity asphalt to solve the problems existing in the above-mentioned background technology.

[0008] To achieve the above objectives, this application is implemented through the following technical solutions:

[0009] A method for shortening the development of high-viscosity asphalt, comprising the following steps:

[0010] S1. Heat the base asphalt to 165-175℃, add the extender and modifier, and swell fully for 30 minutes;

[0011] S2, grinding the swollen mixture in step S1 twice at 170-180°C using a colloid mill;

[0012] S3. Add a segregation improver to the asphalt ground in step S2, and stir and grow it at 180-185°C. After growing it for 1 hour, add a stabilizer, and grow it at a stirring rate of 150 r / min for 8-12 hours.

[0013] A method for shortening the development of high-viscosity asphalt, comprising the following steps:

[0014] S1. Heat the base asphalt to 165-175℃, add the extender and modifier, and swell fully for 30 minutes;

[0015] S2, grinding the swollen mixture obtained in step S1 at 170-180° C. using a colloid mill for the first grinding, adding 1 / 4 of the total amount of a segregation improving agent, and then grinding the mixture for the second time using a colloid mill;

[0016] S3. Add the remaining segregation improver to the asphalt ground in step S2, and stir and grow it at 180-185°C. After growing it for 1 hour, add the stabilizer, and grow it at a stirring rate of 150 r / min for 8-12 hours.

[0017] Furthermore, the grinding head spacing of the colloid mill is 0.02 mm.

[0018] Furthermore, the base asphalt is 70# road petroleum asphalt.

[0019] Furthermore, the retardant is an additive including aromatic oil and furfural extracted oil, and the density is 0.95-1.05 g / cm 3 , flash point is greater than 230℃.

[0020] Furthermore, the modifier is triblock linear SBS.

[0021] Furthermore, the stabilizer is one or more selected from stabilizer HMD-2, stabilizer ZZ-1, stabilizer WDJ-2 and stabilizer HSSTAB-3.

[0022] Furthermore, the segregation improving agent is a substance containing a surfactant, a dispersant, and sulfur.

[0023] Furthermore, the mass ratio of the surfactant, the dispersant and the sulfur is 0.1-0.3:1:2.

[0024] The beneficial effects of the present invention are:

[0025] 1. The present invention can improve the surface tension of asphalt, change the solubility parameter, make the modifier more easily dispersed, and have a faster swelling rate.

[0026] 2. The present invention adopts a compound of a segregation improver and a stabilizer. The swollen modifier forms crosslinks under the promotion of high temperature and stabilizer. After the initial swelling, the crosslinking rate is accelerated, the development time is shortened, and the cost is saved.

[0027] 3. The high-viscosity asphalt prepared by the present invention has better storage stability. After being stored for one week, the indicators do not decay and no segregation occurs. DETAILED DESCRIPTION

[0028] The technical solution of the present invention is described in detail below through examples. The following examples are merely exemplary and can only be used to explain and illustrate the technical solution of the present invention, but cannot be construed as limiting the technical solution of the present invention.

[0029] High-viscosity asphalt: High-viscosity modified asphalt significantly improves the high-temperature stability, low-temperature crack resistance, and water damage resistance of asphalt by adding specific modifiers, such as SBS (styrene-butadiene-styrene block copolymer) and rubber powder, so that it can better adapt to the construction requirements and use environment of ultra-thin overlays.

[0030] SBS modifier: SBS is a styrene-butadiene-styrene triblock copolymer, with common linear and star structures. SBS modifier has the characteristics of increasing the stiffness and toughness of asphalt, improving fatigue resistance, water damage resistance, aging resistance and stripping resistance, and SBS modifier also has the ability to increase the softening point and ductility of asphalt.

[0031] Stabilizer: It mainly forms a network structure within the asphalt to combine with the asphalt to increase its thermal stability and toughness.

[0032] Ductility enhancer: Increases the ductility of modified asphalt and improves low-temperature performance, which is equivalent to softening oil.

[0033] Segregation improver: improves asphalt surface tension, promotes compatibility, and accelerates the cross-linking of modifiers.

[0034] The high-viscosity asphalt prepared by this technology is composed of 100 parts of 70# base asphalt, 8-12 parts of SBS modifier, 3.5-6 parts of retardant, 0.08-0.2 parts of stabilizer and 0.1-0.25 parts of segregation improver by weight.

[0035] Example 1

[0036] S1. Pour 3 kg of base asphalt (70#A grade road petroleum asphalt) into the raw material tank and heat it to 170°C. Add 5.3% extender and 8.5% SBS to swell.

[0037] S2. After swelling for 15 minutes, grind twice using a colloid mill at 175°C.

[0038] S3. After grinding, heat to 183°C and stir for 10 minutes, then add 0.15% segregation improver, stir at 150 r / min for 1 hour, then add 0.1% stabilizer, stir at 150 r / min for 10 hours.

[0039] In this embodiment, the amount of each additive added is based on the amount of base asphalt used. In the following embodiments, it is determined accordingly.

[0040] Example 2

[0041] S1. Pour 3 kg of base asphalt (70#A grade road petroleum asphalt) into the raw material tank and heat it to 170℃, add 5.8% extender and 10% SBS to swell.

[0042] S2. After swelling for 15 minutes, grind twice using a colloid mill at 175°C.

[0043] S3. After grinding, heat to 183°C and stir. After stirring for 10 minutes, add 0.2% segregation improver, stir at 150 r / min for 1 hour, add 0.05% stabilizer, and stir at 150 r / min for 10 hours.

[0044] Example 3

[0045] S1. Pour 2.5 kg of base asphalt (70#A grade road petroleum asphalt) into the raw material tank and heat it to 170°C, add 5.5% extender and 9% SBS to swell.

[0046] S2. After swelling for 15 minutes, the first colloid mill grinding was carried out at a temperature of 175°C. After grinding, 0.05% of the separation modifier was added and the second colloid mill grinding was carried out under the same conditions.

[0047] S3. After grinding, heat to 183℃ and stir. After stirring for 10 minutes, add 0.15% segregation improver, stir at 150r / min for 1 hour, add 0.05% stabilizer, and stir at 150r / min for 10 hours.

[0048] Comparative Example 1

[0049] S1. Pour 3 kg of base asphalt (70#A grade road petroleum asphalt) into the raw material tank and heat it to 170℃, add 5.6% extender and 9.5% SBS to swell.

[0050] S2. After swelling for 15 minutes, grind twice using a colloid mill at 175°C.

[0051] S3. After grinding, heat to 183℃ and stir for 10 minutes, then add 0.25% stabilizer and stir at 150r / min for 10 hours.

[0052] Comparative Example 2

[0053] S1. Pour 2.5 kg of base asphalt (70#A grade road petroleum asphalt) into the raw material tank and heat it to 170°C, add 5.5% extender and 9% SBS to swell.

[0054] S2. After swelling for 15 minutes, grind twice using a colloid mill at 175°C.

[0055] S3. After grinding, heat to 183°C and stir for 10 minutes, then add 0.3% stabilizer and stir at 150r / min for 19 hours.

[0056] The test data of the above embodiments and comparative examples are shown in Table 1.

[0057] Table 1

[0058]

[0059] The data in Table 1 show that after adding the segregation improver, under the same conditions, the development time can be shortened by nearly 50% without affecting other indicators.

[0060] The above embodiments are only used to help understand the method and core idea of ​​the present invention. It should be noted that, for those skilled in the art, several improvements and modifications can be made to the present invention without departing from the principles of the present invention, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A method for shortening the development of high-viscosity asphalt, characterized in that: The following steps are involved: S1. Heat the base asphalt to 165-175℃, add the extender and modifier, and swell fully for 30 minutes; S2, grinding the swollen mixture in step S1 twice at 170-180°C using a colloid mill; S3. Add a segregation improver to the asphalt ground in step S2, and stir and grow it at 180-185°C. After growing it for 1 hour, add a stabilizer, and grow it at a stirring rate of 150 r / min for 8-12 hours.

2. A method for shortening the development of high-viscosity asphalt, characterized in that: The following steps are involved: S1. Heat the base asphalt to 165-175℃, add the extender and modifier, and swell fully for 30 minutes; S2, grinding the swollen mixture obtained in step S1 at 170-180° C. using a colloid mill for the first grinding, adding 1 / 4 of the total amount of a segregation improving agent, and then grinding the mixture for the second time using a colloid mill; S3. Add the remaining segregation improver to the asphalt ground in step S2, and stir and grow it at 180-185°C. After growing it for 1 hour, add the stabilizer, and grow it at a stirring rate of 150 r / min for 8-12 hours.

3. The method for shortening the development of high-viscosity asphalt according to claim 1 or 2, characterized in that: The grinding head spacing of the colloid mill is 0.02mm.

4. The method for shortening the development of high-viscosity asphalt according to claim 1 or 2, characterized in that: The base asphalt is 70# road petroleum asphalt.

5. The method for shortening the development of high-viscosity asphalt according to claim 1 or 2, characterized in that: The retardant is an additive including aromatic oil and furfural extracted oil, with a density of 0.95-1.05g / cm 3 , flash point is greater than 230℃.

6. The method for shortening the development of high-viscosity asphalt according to claim 1 or 2, characterized in that: The modifier is triblock linear SBS.

7. The method for shortening the development of high-viscosity asphalt according to claim 1 or 2, characterized in that: The stabilizer is one or more selected from stabilizer HMD-2, stabilizer ZZ-1, stabilizer WDJ-2 and stabilizer HSSTAB-3.

8. The method for shortening the development of high-viscosity asphalt according to claim 1 or 2, characterized in that: The segregation improving agent is a substance containing a surfactant, a dispersant, and sulfur.

9. The method for shortening the development of high-viscosity asphalt according to claim 8, characterized in that: The mass ratio of the surfactant, the dispersant and the sulfur is 0.1-0.3:1:2.

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