Sodium lignosulfonate grafted magnesium-aluminum-based layered double hydroxide modifier, UV aging resistant SBR modified asphalt and preparation method thereof

A technology of sodium lignosulfonate and double hydroxide, applied in building structures, building components, building insulation materials, etc., can solve the problems of affecting UV protection, poor compatibility with asphalt, aging, etc., and achieve excellent UV resistance. Light aging ability, improving UV aging resistance, and remarkable effect of anti-ultraviolet aging performance

Inactive Publication Date: 2019-06-28
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, SBR modified asphalt is susceptible to aging due to external factors such as heat, oxygen, and ultraviolet light during its laying and use, resulting in cracks, ruts, and potholes on the road surface.
In particular, ultraviolet light has a short wavelength and high energy, which has the most serious damage to asphalt pavement, and will cause SBR aging degradation, which significantly reduces the low-temperature ductility of modified asphalt, resulting in deterioration of asphalt pavement road performance and shortened service life.
[0003] In order to improve the anti-ultraviolet aging performance of SBR modified asphalt, the patent CN 102181162 A discloses a magnesium-aluminum-based layered double hydroxide anti-aging SBR modified asphalt, and the magnesium-aluminum-based layered double hydroxide has excellent UV resistance The shielding effect of SBR modified asphalt can improve the anti-ultraviolet aging ability of SBR modified asphalt. However, since magnesium-aluminum-based double hydroxide is an inorganic powder, it has poor compatibility with SBR-modified asphalt. Magnesium-aluminum-based double hydroxide Settlement is easy to occur in SBR modified asphalt, which seriously affects the UV protection effect of magnesium-aluminum-based layered double hydroxide on SBR modified asphalt
In addition, the UV aging resistance of SBR modified asphalt needs to be further improved in Xinjiang, Tibet and other plateau strong ultraviolet areas

Method used

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  • Sodium lignosulfonate grafted magnesium-aluminum-based layered double hydroxide modifier, UV aging resistant SBR modified asphalt and preparation method thereof
  • Sodium lignosulfonate grafted magnesium-aluminum-based layered double hydroxide modifier, UV aging resistant SBR modified asphalt and preparation method thereof
  • Sodium lignosulfonate grafted magnesium-aluminum-based layered double hydroxide modifier, UV aging resistant SBR modified asphalt and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Heat 95 parts (parts by mass, the same below) of SBR modified asphalt (with a penetration of 63dmm at 25°C and a softening point of 59.3°C) to 160°C, and add the above-mentioned sodium lignosulfonate grafted magnesium-aluminum-based layered double hydroxide 5 parts of the material modifier, start the high-speed shearing machine, stir at a high speed at 4000 rpm for 1 hour, and keep the temperature at 160 ℃ ± 5 ℃ to obtain the UV aging resistant SBR modified asphalt.

[0023] The ultraviolet aging resistant SBR modified asphalt and the original SBR modified asphalt (comparative sample) were subjected to an ultraviolet accelerated aging test (ultraviolet light intensity is 1200μW / cm 2 , The temperature is 60℃, the aging time is 9 days, the same below), and then test its penetration (reflecting the softness and consistency of asphalt, and the ability to resist shear damage), softening point (reflecting the high temperature resistance of asphalt to deformation ) And 5℃ ductilit...

Embodiment 2

[0028] According to parts by mass, heat 97 parts of SBR modified asphalt (with a penetration of 86dmm at 25°C and a softening point of 56.8°C) to 160°C, and add the above-mentioned sodium lignosulfonate grafted magnesium-aluminum-based layered double hydroxide to modify 3 parts of the agent, start the high-speed shearing machine, stir at a high speed at 4000 rpm for 1 hour, and keep the temperature at 160°C±5°C to obtain the UV-resistant aging SBR modified asphalt.

[0029] The ultraviolet aging resistant SBR modified asphalt and the original SBR modified asphalt (comparative sample) were subjected to an ultraviolet accelerated aging test, and then the penetration, softening point and 5°C ductility were tested respectively. The test results are listed in Table 2.

[0030] Table 2 Performance changes before and after UV aging of SBR modified asphalt and comparison samples

[0031]

[0032] Through comparison, it can be seen that after UV aging, the penetration decrease value, softenin...

Embodiment 3

[0034] According to parts by mass, heat 96 parts of SBR modified asphalt (with a penetration degree of 103dmm at 25°C and a softening point of 54.2°C) to 160°C, and add the above-mentioned sodium lignosulfonate grafted magnesium-aluminum-based layered double hydroxide to modify 4 parts of the agent, start the high-speed shearing machine, stir at a high speed at 4000 rpm for 1 hour, and keep the temperature at 160 ℃ ± 5 ℃, then the UV aging resistant SBR modified asphalt is prepared.

[0035] The ultraviolet aging resistant SBR modified asphalt and the original SBR modified asphalt (comparative sample) were subjected to an ultraviolet accelerated aging test, and then the penetration, softening point and 5°C ductility were tested respectively. The test results are listed in Table 3.

[0036] Table 3 Performance changes before and after UV aging of SBR modified asphalt and comparison samples

[0037]

[0038] Through comparison, it can be seen that after UV aging, the decrease in penetr...

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Abstract

The invention relates to a modifier, SBR (styrene-butadiene rubber) modified asphalt and a preparation method of the SBR modified asphalt. A sodium lignosulfonate grafted magnesium-aluminum-based LDH (layered double hydroxide) modifier is characterized by being prepared from lignin and magnesium-aluminum-based LDHs by grafting. Ultraviolet-aging-resistant SBR modified asphalt is characterized by being prepared from raw materials in percentage by mass as follows: 90%-99% of the SBR modified asphalt and 1%-10% of the sodium lignosulfonate grafted magnesium-aluminum-based LDH modifier. The ultraviolet-aging resistance of the SBR modified asphalt can be improved remarkably by adding sodium lignosulfonate grafted magnesium-aluminum-based LDHs to the SBR modified asphalt, magnesium-aluminum-based LDHs can be dispersed in the SBR modified asphalt stably for a long time, and the prepared SBR modified asphalt has excellent ultraviolet-aging resistance.

Description

Technical field [0001] The invention relates to a modifier, SBR modified asphalt and a preparation method thereof, in particular to a sodium lignosulfonate grafted magnesium-aluminum-based layered double hydroxide modifier, ultraviolet aging resistant SBR modified asphalt and the same Preparation. Background technique [0002] Styrene-butadiene rubber (SBR) modified asphalt pavement has excellent low-temperature crack resistance and is widely used in Xinjiang, Tibet and other regions of my country. However, SBR modified asphalt is susceptible to aging due to external factors such as heat, oxygen, and ultraviolet light during its paving and use process, causing road cracks, rutting, potholes and other diseases. In particular, the short wavelength and high energy of ultraviolet light have the most serious damage to asphalt pavement. It will also cause SBR degradation and significantly reduce the low-temperature ductility of modified asphalt, resulting in deterioration of asphalt p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L95/00C08L9/06C08K9/04C08K7/00C08K3/26C08K3/22
CPCC08L95/00C08L2201/08C08L2205/03C08L9/06C08K9/08C08K9/04C08K7/00C08K3/26C08K3/22
Inventor 余剑英何边阳吴少鹏薛理辉刘全涛庞凌孙育斌
Owner WUHAN UNIV OF TECH
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