Alkali lignin-grafted magnesium-aluminum-based layered double hydroxide modifier, UV aging-resistant SBS modified asphalt and preparation method thereof

A double hydroxide and modified asphalt technology, applied in building structures, building components, building thermal insulation materials, etc., can solve the problems of poor compatibility of SBS modified asphalt, affecting the effect of ultraviolet protection, easy to cause settlement, etc. The effect of good dispersibility and excellent UV reflection ability

Inactive Publication Date: 2019-02-05
WUHAN UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Patent CN 102174269 A discloses a magnesium-aluminum-based layered double hydroxide anti-aging SBS modified asphalt. The magnesium-aluminum-based layered double hydroxide has excellent shielding effect on ultraviolet rays and can improve the UV resistance of SBS modified asphalt Aging ability, but since the magnesium-aluminum-based layered double hydroxide is an inorganic powder, it has poor compatibility with SBS modified asphalt, and the magnesium-aluminum-based layered double hydroxide is prone to sedimentation in SBS modified asphalt, which seriously affects UV protection effect of magnesium-aluminum-based layered double hydroxide on SBS modified asphalt
At the same time, the UV aging resistance of SBS modified asphalt in the strong ultraviolet area of ​​the plateau needs to be further improved

Method used

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  • Alkali lignin-grafted magnesium-aluminum-based layered double hydroxide modifier, UV aging-resistant SBS modified asphalt and preparation method thereof
  • Alkali lignin-grafted magnesium-aluminum-based layered double hydroxide modifier, UV aging-resistant SBS modified asphalt and preparation method thereof
  • Alkali lignin-grafted magnesium-aluminum-based layered double hydroxide modifier, UV aging-resistant SBS modified asphalt and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] In parts by mass, heat 93 parts (parts by mass, the same below) of SBS modified asphalt (penetration at 25°C is 58dmm, softening point is 77.0°C) to 160°C, add the above-mentioned alkali lignin grafted magnesium-aluminum-based bilayer 7 parts (parts by mass) of hydroxide modifier, 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 UV-resistant SBS modified asphalt.

[0023] The ultraviolet aging-resistant SBS modified asphalt and the original SBS modified asphalt (comparative sample) were subjected to ultraviolet accelerated aging test (ultraviolet light intensity was 1200 μW / cm 2 , the temperature is 60°C, the aging time is 9 days, the same below), and then, the softening point (reflecting the high-temperature deformation resistance of asphalt), the viscosity at 135°C (reflecting the high-temperature fluidity of asphalt) and the ductility at 5°C (reflecting asphalt Low temperature crack r...

Embodiment 2

[0029]In parts by mass, 97 parts of SBS modified asphalt (penetration of 72dmm at 25°C, softening point of 67.6°C) was heated to 160°C, and the above-mentioned alkali lignin grafted magnesium-aluminum-based double hydroxide modifier 3 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 UV-resistant SBS modified asphalt.

[0030] The ultraviolet aging-resistant SBS modified asphalt and the original SBS modified asphalt (comparative sample) were subjected to ultraviolet accelerated aging test, and then their softening point, viscosity at 135°C and ductility at 5°C were tested respectively. The test results are listed in Table 2.

[0031] Table 2 Performance changes of UV aging-resistant SBS modified asphalt and control samples before and after UV aging

[0032]

[0033] It can be seen from the comparison that after ultraviolet aging, the softening point increase value, viscosity increase value at 1...

Embodiment 3

[0035] In parts by mass, heat 94 parts of SBS modified asphalt (penetration of 88dmm at 25°C and softening point of 59.8°C) to 160°C, add the above-mentioned alkali lignin grafted magnesium-aluminum-based double hydroxide modifier 6 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 UV-resistant SBS modified asphalt.

[0036] The ultraviolet aging-resistant SBS modified asphalt and the original SBS modified asphalt (comparative sample) were subjected to ultraviolet accelerated aging tests, and then their softening point, viscosity at 135°C and ductility at 5°C were tested respectively. The test results are listed in Table 3.

[0037] Table 3 Changes in properties of UV aging-resistant SBS modified asphalt and control samples before and after UV aging

[0038]

[0039] It can be seen from the comparison that after ultraviolet aging, the softening point increase value, viscosity increase value at ...

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Abstract

The invention relates to a modifying agent, an SBS modified asphalt and a preparation method thereof. An alkali lignin-grafted magnesium aluminum-based layered double hydroxide modifying agent is characterized by being prepared from alkali lignin and a magnesium aluminum-based layered double hydroxide. Anti-ultraviolet anti-ageing SBS modified asphalt is characterized by comprising the following raw materials in percentage by mass: 90 to 99 percent of the SBS modified asphalt, and 1 to 10 percent of the alkali lignin-grafted magnesium aluminum-based layered double hydroxide modifying agent. According to the modifying agent, the SBS modified asphalt and the preparation method thereof, the anti-ultraviolet and anti-ageing capacity of the SBS modified asphalt can be remarkably improved by adding the alkali lignin-grafted magnesium aluminum-based layered double hydroxide modifying agent into the SBS modified asphalt; long-term stable dispersion of magnesium aluminum-based layered double hydroxide in the SBS modified asphalt is realized; the prepared SBS modified asphalt has excellent anti-ultraviolet and anti-ageing capacity.

Description

technical field [0001] The invention relates to a modifier, SBS modified asphalt and a preparation method thereof, in particular to an alkali lignin grafted magnesium-aluminum-based layered double hydroxide modifier, an ultraviolet aging-resistant SBS modified asphalt and a preparation method thereof . Background technique [0002] Asphalt pavement has the advantages of comfortable driving, low energy consumption and easy maintenance, etc., and its proportion in road construction is getting higher and higher. However, ordinary asphalt has poor high and low temperature performance, and the road paved with it is prone to defects such as ruts and potholes, and has a short service life, especially under heavy traffic conditions. To solve this problem, polymers are usually used to modify asphalt, so as to improve the road performance of asphalt mixture. Among them, styrene-butadiene-styrene triblock copolymer (SBS) is a linear or star-shaped block copolymer synthesized from sty...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08K9/08C08K3/22C08K7/00C08L95/00C08L53/02
CPCC08K3/22C08K7/00C08K9/08C08L95/00C08L2201/08C08L53/02
Inventor 余剑英何边阳章灿林吴少鹏薛理辉刘全涛
Owner WUHAN UNIV OF TECH
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