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Anti-aging functionalized montmorillonite modified asphalt and preparation method thereof

An anti-aging and functional technology, applied in building components, building insulation materials, construction, etc., can solve the problems of less modified asphalt application research and achieve the effect of improving dispersion

Active Publication Date: 2020-09-11
CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Biomimetic modification of dopamine has been widely studied and applied in the fields of chemistry, biomedicine, pharmacy, sensor and battery manufacturing, but less research has been done on the application of modified asphalt

Method used

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  • Anti-aging functionalized montmorillonite modified asphalt and preparation method thereof
  • Anti-aging functionalized montmorillonite modified asphalt and preparation method thereof
  • Anti-aging functionalized montmorillonite modified asphalt and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0033]Disperse 1 part of dry montmorillonite in 200 parts of deionized water, and stir at 1200 r / min for 1 h. The preparation method of the Tris-HCl buffer solution is to add 2.484g of Tris into 200ml of deionized water, and adjust the pH value of the solution to 8-9 with hydrochloric acid. Take 0.5 parts of dopamine and add it into the prepared Tris-HCl buffer solution to adjust the pH value of the solution to 8-9. Quickly add the montmorillonite suspension to the dopamine solution, the stirring speed is 800r / min, and the stirring time is 2h. After stirring at a high speed, the precipitate is washed and fully dried at 90-120°C to obtain the mass ratio of montmorillonite: dopamine 2:1 PMMT 1 .

Embodiment 2

[0039] Obtain PMMT through embodiment 1 1 . The PMMT obtained by melting 1 For the modification of asphalt, take 100 parts of asphalt and pour it into the reaction vessel of the heating mantle, heat it to about 145 ° C ~ 160 ° C, and then add 4 parts of PMMT 1 Add it to the molten asphalt in several times, and shear it for 40min at a shear rate of 4000r / min, so that PMMT 1 Fully dispersed in molten asphalt. Add 4.5 parts of SBS to the asphalt in several times, and shear at a shear rate of 4000r / min for 80min. Then develop for 60min at a stirring speed of 600r / min to obtain aging-resistant PMMT / SBS-A. According to the national standard JTG E20-2011 "Test Regulations for Asphalt and Asphalt Mixtures in Highway Engineering", PMMT / SBS-A were subjected to short-term aging for 85 minutes, long-term aging for 20 hours under 2.1MPa±0.1MPa air pressure and light intensity 15mW / cm 2 Under UV aging for 120h.

[0040] The influence of PMMT on the anti-aging performance of asphalt ...

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Abstract

The invention discloses anti-aging functionalized montmorillonite modified asphalt and a preparation method thereof. The preparation method comprises the following steps: (1) modifying montmorilloniteby dopamine to obtain multifunctional dopamine montmorillonite (PMMT); and (2) adding PMMT into the molten asphalt or polymer modified asphalt for shearing and development to prepare the PMMT modified asphalt with high efficiency and aging resistance; (3) carrying out different aging treatments on the asphalt. Compared with styrene-butadiene-styrene block copolymer (SBS) modified asphalt, the styrene-butadiene-styrene block copolymer (SBS) modified asphalt has the advantages that the toughness is high; the viscosity aging index (VAI) of the PMMT / SBS modified asphalt at 135 DEG C can be reduced by 50%, wherein the reduction amplitude of the track factor aging index (RAI) can reach 31% and is higher than the aging index ratio of the SBS modified asphalt to the organic montmorillonite (OMMT) / SBS modified asphalt, and the PMMT modified asphalt shows excellent rheological property and aging resistance.

Description

technical field [0001] The invention belongs to the technical field of nano-modified asphalt materials, and in particular relates to an aging-resistant functionalized montmorillonite modified asphalt and a preparation method thereof. Background technique [0002] At present, polymer modified asphalt is the most widely used modified asphalt in high-grade highway construction. The polymer endows asphalt with good high-temperature and low-temperature performance and fatigue performance, and greatly improves the impact resistance, crack resistance and wear resistance of the pavement. Styrene-butadiene-styrene block copolymer (SBS) is one of the modifiers with the best modification effect. The interaction and modification effect of SBS and asphalt has attracted widespread attention and research. During the mixing, transportation, paving and use of asphalt, affected by thermal oxygen and natural environmental factors, thermal oxygen aging and ultraviolet aging of asphalt and SBS...

Claims

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Application Information

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IPC IPC(8): C08L95/00C08K9/04C08K3/34
CPCC08K9/04C08K3/346C08K2201/011C08L2201/08C08L95/00
Inventor 梁波石凯张宽宽郑健龙
Owner CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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