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Lignin-grafted magnesium-aluminum-based layered double hydroxide modifier, UV-resistant asphalt and preparation method thereof

A technology of double hydroxide and lignin, which is applied in the direction of building structure, building components, building insulation materials, etc., can solve the problems of poor compatibility of asphalt, easy settlement, and affecting the UV protection effect of asphalt, and achieve long-term dispersion. Effect of improving UV aging resistance and excellent UV aging resistance

Inactive Publication Date: 2019-07-12
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the magnesium-aluminum-based layered double hydroxide is an inorganic powder and has poor compatibility with asphalt, the magnesium-aluminum-based layered double hydroxide is prone to sedimentation in asphalt, which seriously affects the quality of the magnesium-aluminum-based layered double hydroxide. UV protection for asphalt
At the same time, the UV aging resistance of asphalt in plateau strong ultraviolet areas needs to be further improved

Method used

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  • Lignin-grafted magnesium-aluminum-based layered double hydroxide modifier, UV-resistant asphalt and preparation method thereof
  • Lignin-grafted magnesium-aluminum-based layered double hydroxide modifier, UV-resistant asphalt and preparation method thereof
  • Lignin-grafted magnesium-aluminum-based layered double hydroxide modifier, UV-resistant asphalt and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Heat 97 parts (parts by mass, the same below) of road petroleum asphalt (with a penetration of 78dmm at 25°C and a softening point of 48.5°C) to 160°C, and add the above-mentioned lignin-grafted magnesium-aluminum-based double hydroxide modifier 3 parts, start the high-speed shearing machine, stir at a high speed of 4000rpm for 1 hour, and keep the temperature at 160 ° C ± 5 ° C, that is, the ultraviolet aging-resistant asphalt is prepared.

[0025] The ultraviolet aging-resistant asphalt and unmodified asphalt (comparative sample) were carried out ultraviolet accelerated aging test (ultraviolet light intensity is 1200μW / cm 2 , the temperature is 60°C, the aging time is 9 days, the same below), and then the penetration (reflecting the softness and consistency of asphalt and the ability to resist shear damage) and softening point (reflecting the high-temperature deformation resistance of asphalt ) and 10°C ductility (reflecting low temperature cracking resistance of asph...

Embodiment 2

[0030] In parts by mass, 94 parts of road petroleum asphalt (penetration at 25°C is 112dmm, softening point is 46.0°C) is heated to 160°C, and 6 parts of the above-mentioned lignin-grafted magnesium-aluminum-based double hydroxide modifier is added, Start the high-speed shearing machine, stir at a high speed of 4000rpm for 1 hour, and keep the temperature at 160°C±5°C to obtain the UV-resistant aging asphalt.

[0031] The ultraviolet aging-resistant asphalt and unmodified asphalt (comparative sample) were subjected to ultraviolet accelerated aging test, and then their penetration, softening point and 10°C ductility were tested respectively. The test results are listed in Table 2.

[0032] Table 2 Performance changes of UV aging-resistant asphalt and control samples before and after UV aging

[0033]

[0034] It can be seen from the comparison that after UV aging, the decreased value of penetration, the increased value of softening point and the decreased value of ductility ...

Embodiment 3

[0036]In parts by mass, 95 parts of road petroleum asphalt (penetration at 25°C is 78dmm, softening point is 48.5°C) is heated to 160°C, and 5 parts of the above-mentioned lignin-grafted magnesium-aluminum-based double hydroxide modifier is added, Start the high-speed shearing machine, stir at a high speed of 4000rpm for 1 hour, and keep the temperature at 160°C±5°C to obtain the UV-resistant aging asphalt.

[0037] The ultraviolet aging-resistant asphalt and unmodified asphalt (comparative sample) were subjected to ultraviolet accelerated aging test, and then their penetration, softening point and 10°C ductility were tested respectively. The test results are listed in Table 3.

[0038] Table 3 Performance changes of UV aging-resistant asphalt and control samples before and after UV aging

[0039]

[0040] It can be seen from the comparison that after UV aging, the decreased value of penetration, the increased value of softening point and the decreased value of ductility at...

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Abstract

The invention relates to a modifier, anti-ultraviolet ageing asphalt and a preparation method thereof. The lignin grafted magnesium aluminum-based layered double hydroxide modifier is characterized by being prepared by grafting lignin and magnesium aluminum-based layered double hydroxide. The anti-ultraviolet ageing asphalt is characterized by being prepared from the following raw materials by mass percent: 90% to 99% of asphalt and 1 to 10% of the lignin grafted magnesium aluminum-based layered double hydroxide modifier. The lignin grafted magnesium aluminum-based layered double hydroxide modifier is added to the asphalt, so that the anti-ultraviolet ageing ability of the asphalt can be obviously improved, the long-term stable dispersion of the magnesium aluminum-based layered double hydroxide in the asphalt can be realized, and the prepared modified asphalt has excellent anti-ultraviolet ageing ability.

Description

technical field [0001] The invention relates to a modifier, an ultraviolet aging-resistant asphalt and a preparation method thereof, in particular to a lignin-grafted magnesium-aluminum-based double hydroxide modifier, an ultraviolet aging-resistant asphalt and a preparation method thereof. Background technique [0002] Asphalt pavement is widely used because of its excellent road performance, comfortable driving, strong adaptability to subgrade deformation or uneven settlement, and easy maintenance. However, as an organic material, asphalt is susceptible to aging due to the effects of natural environmental factors such as light, heat, and oxygen during service, which leads to a decrease in the resistance to temperature shrinkage cracks and fatigue damage of the asphalt pavement, making the asphalt pavement prone to occurrences such as Cracks, ruts, looseness and other diseases, the fatigue cracking resistance of asphalt pavement are greatly reduced, and the service life is ...

Claims

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Application Information

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IPC IPC(8): C08L95/00C08L97/00C08K7/00
CPCC08L95/00C08L2201/08C08L2205/08C08L97/005C08K7/00
Inventor 余剑英何边阳章灿林吴少鹏薛理辉孙育斌
Owner WUHAN UNIV OF TECH
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