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Reaction regenerated SBS modified asphalt and preparation method thereof

A modified asphalt, reaction regeneration technology, applied in building components, building insulation materials, construction and other directions, can solve the problems of high-quality engineering application limitations of SBS modified asphalt, difficult high temperature performance and adhesion of SBS modified asphalt, etc. Achieve the effect of high-performance recycling and significant engineering value

Pending Publication Date: 2021-11-02
WUHAN INSTITUTE OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although these technologies have a good effect on improving the low temperature and fatigue characteristics of aged SBS modified asphalt, the high temperature performance and adhesion of the regenerated SBS modified asphalt are difficult to reach or approach the performance level of the original SBS modified asphalt, resulting in reaction The high-quality engineering application of recycled SBS modified asphalt is greatly limited

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Weigh 100g of aged SBS modified asphalt heated to a molten state. After the temperature is stabilized at 150°C, add 1g of 4,4-diphenylmethane diisocyanate and stir at a stirring speed of 300rpm for 5min to prepare the regenerated SBS modified asphalt. According to the "Test Regulations for Asphalt and Asphalt Mixtures in Highway Engineering" (JTJE20-2011), the physical properties of the reaction-regenerated SBS modified asphalt were tested. The softening point of the reaction-regenerated SBS modified asphalt was 69.8°C, and the ductility at 5°C was 6.8. cm, the penetration at 25°C is 29.2dmm, and the viscosity at 135°C is 4.21Pa·s.

[0027] It can be seen from the test results that 4,4-diphenylmethane diisocyanate mainly improves the softening point of aged SBS modified asphalt, but has no effect on improving low temperature ductility and working characteristics.

Embodiment 2

[0029] Weigh 100g of aged SBS modified asphalt heated to a molten state, and after the temperature stabilizes at 150°C, add 1g of 1,4-butanediol diglycidyl ether, and continue to stir at a stirring speed of 300rpm for 5min, thus preparing the reaction Recycled SBS modified bitumen. According to the "Test Regulations for Asphalt and Asphalt Mixtures in Highway Engineering" (JTJE20-2011), the physical properties of the reaction-regenerated SBS modified asphalt were tested. The 5°C ductility of the reaction-regenerated SBS modified asphalt was 18.9cm, and the softening point was 58.4 ℃, the penetration at 25℃ is 39.8dmm, and the viscosity at 135℃ is 2.29Pa·s.

[0030] It can be seen from the test results that 1,4-butanediol diglycidyl ether mainly has the effect of improving the low-temperature ductility and working characteristics of aged SBS-modified asphalt, but it will reduce the high-temperature performance of aged SBS-modified asphalt to a certain extent.

Embodiment 3

[0032] Weigh 100g of aged SBS modified asphalt heated to a molten state, after the temperature is stabilized at 150°C, add 1g of 4,4-diphenylmethane diisocyanate at a stirring speed of 300rpm, and then add 1g of 1,4-butane after 5min Glycol diglycidyl ether, continue to stir for 5 minutes, and prepare the SBS modified asphalt regenerated by reaction. According to the "Test Regulations for Asphalt and Asphalt Mixtures in Highway Engineering" (JTJE20-2011), the physical properties of the reaction-regenerated SBS modified asphalt were tested. The 5°C ductility of the reaction-regenerated SBS modified asphalt was 18.1cm, and the softening point was 67.2 ℃, the penetration at 25℃ is 34.6dmm, and the viscosity at 135℃ is 3.02Pa·s.

[0033] As can be seen from the test results, Comparative Example 1 and 2,4,4-diphenylmethane diisocyanate and 1,4-butanediol diglycidyl ether have complementary effects on the regeneration of aged SBS modified asphalt, while improving the aging High and...

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Abstract

The invention belongs to the field of recycling and regeneration cyclic utilization of road engineering materials, and particularly relates to reaction regenerated SBS modified asphalt and a preparation method thereof. The method comprises the following steps: 1) obtaining aged SBS modified asphalt, a diisocyanate structure repairing agent, a diepoxy structure repairing agent and an asphalt regenerant; 2) heating the aged SBS modified asphalt to 140-160 DEG C, then adding an asphalt regenerant at the stirring speed of 200-400 rpm, and conducting stirring; and (3) sequentially adding a diisocyanate structure repairing agent and a diepoxy structure repairing agent into the mixture obtained in the step (2), and conducting stirring and reacting at the temperature of 140-160 DEG C and the stirring speed of 200-400rpm to prepare the reaction regenerated SBS modified asphalt. The inventor finds that the softening point of the SBS modified asphalt can be prevented from being too high to be close to that of original asphalt by adding the two repairing agents at the same time, so that the high-temperature performance, the low-temperature performance and the ductility of the SBS modified asphalt regenerated through the reaction are ensured.

Description

technical field [0001] The invention belongs to the field of resource utilization and recycling of road engineering materials, and in particular relates to a reaction-regenerated SBS modified asphalt and a preparation method thereof. Background technique [0002] Asphalt pavement has been widely used in highway construction because of its advantages of smooth surface, no expansion joints, comfortable driving, low noise, easy construction and maintenance. In the early days at home and abroad, ordinary petroleum asphalt was mainly used to pave the road surface, but its high and low temperature performance is poor, and the road surface is prone to rutting, potholes, and cracks. It is easy to be seriously damaged especially under heavy traffic conditions, and its service life is short. In order to prolong the service life of asphalt pavement, since the 1990s, styrene and butadiene triblock thermoplastic elastomer (SBS) modified asphalt has been applied to the pavement at home an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L95/00C08L53/02C08L91/00C08K5/29C08K5/1515
CPCC08L95/00C08L53/02C08L91/00C08K5/29C08K5/1515
Inventor 徐雄沈炜力陈旭勇吴巧云陈国夫程书凯屠艳平程子扬
Owner WUHAN INSTITUTE OF TECHNOLOGY
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