Phyllosilicate nano modified asphalt by dual processing of intercalation and coupling and preparation method thereof

A nano-modified, silicate technology, used in building components, building insulation materials, buildings, etc.

Inactive Publication Date: 2009-09-09
CHONGQING JIAOTONG UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are very few researches in this area at home and abroad, and the application of nanocomposite technology in modified asphalt still faces many difficulties.

Method used

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  • Phyllosilicate nano modified asphalt by dual processing of intercalation and coupling and preparation method thereof
  • Phyllosilicate nano modified asphalt by dual processing of intercalation and coupling and preparation method thereof
  • Phyllosilicate nano modified asphalt by dual processing of intercalation and coupling and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The composition of embodiment 1 nano-modified asphalt

[0031] In an embodiment, the layered clay silicate, the water-soluble organic cation intercalation agent, and the coupling agent respectively adopt bentonite, dioctadecyltrimethylammonium bromide or / octadecyltrimethylammonium chloride and γ-aminopropyltriethoxysilane (abbreviated as KH550), by mass ratio, bentonite: dioctadecyltrimethylammonium bromide or / octadecyltrimethylammonium chloride: γ-aminopropyl Triethoxysilane is 1:0.6:0.01 to form organic layered clay silicate, and the mass ratio of organic layered clay silicate to asphalt is 0.04:1.

Embodiment 2

[0032] Embodiment 2 intercalation principle, process and method

[0033](1) Principle: The structural characteristics of bentonite determine that one of its main characteristics is the cation exchange performance of bentonite. The introduction of organic cations increases the interlayer spacing of montmorillonite and increases the organic phase, which has a significant impact on the adsorption characteristics of montmorillonite; secondly, quaternary ammonium salt surfactants are easy to enrich because of their amphiphilic molecular structure. A variety of ordered molecular assemblies are formed on the surface and in the solution. This special structural feature enables it to be used in the surface modification of bentonite, that is, the physical and chemical interactions between the hydrophilic group and the surface of the silicic acid sheet, adsorption On the surface of the particles, the lipophilic group faces outward, making the surface of the sheet layer change from hydrop...

example 3

[0039] The improvement of the nano-modified asphalt in the above-mentioned embodiment in example 3 aspect high temperature stability

[0040] 1) Improved high temperature performance of asphalt

[0041] The high-temperature stability performance indicators of asphalt binder include: the softening point T obtained from conventional tests R&B , equivalent softening point T 800 ; G in the dynamic shear test of the index reflecting high temperature stability in the SHRP standard * / sinδ and the critical temperature T in the dynamic shear rheological test 1 (G * / sinδ=1.0KPa, before aging) and T 2 (G * / sinδ=2.2KPa, after rotating thin film aging RTFOT). The asphalt sample prepared in this example was tested by the laboratory testing center, and the test results of its high temperature performance are shown in Table 1.

[0042] Table 1 Test results of high temperature performance indicators of asphalt

[0043]

[0044] Note: T R&B is the softening point of asphal...

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Abstract

The invention adopts organic cation intercalator and coupling agent to carry out organification intercalation processing on laminated clay silicate, so as to prepare organification laminated clay silicate and mix the silicate with liquated road asphalt to form the modified asphalt. The invention also relates to the preparation process of the modified asphalt. The modified asphalt of the invention not only has better road performance than that of matrix asphalt but also prevents premature failure of asphalt road surface and lengthens service life of the road surface; in addition, the cost of materials and processing devices is far lower than the cost of polymer nano modified asphalt.

Description

technical field [0001] The invention relates to a modified asphalt, in particular to a layered silicate nano-modified asphalt which is double-treated by intercalation and coupling, and also relates to a preparation method of the nano-modified asphalt. Background technique [0002] During the construction of asphalt concrete pavement, because the performance of matrix asphalt is restricted by the properties of crude oil, its technical performance cannot meet the needs of traffic growth. At present, the commonly used method is to modify the polymer by "miscibility" in the base asphalt. Since most of the polymers are not uniformly dispersed in the asphalt, it is difficult to prepare the modified asphalt. Therefore, the research and development of chemically modified asphalt technology with functional modifiers, the use of modifiers with better performance at lower prices, and the use of simple production equipment and processes to reduce overall production costs have become a t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L95/00C08K9/04C08K3/34C08J3/20
Inventor 黄维蓉周超冉龙飞李力朱建勇
Owner CHONGQING JIAOTONG UNIVERSITY
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