Modified asphalt with heat storage stability and preparation method thereof

A modified asphalt and stability technology, which is applied in building components, building insulation materials, buildings, etc., can solve problems such as thermodynamic incompatibility, durability not meeting expectations, asphalt not meeting cohesion, etc.

Active Publication Date: 2017-09-22
CHANGAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, a large number of studies have shown that due to the large differences in molecular weight, density, solubility parameters and other physical and chemical properties between the polymer and asphalt, the compatibility between the two is poor, and the polymer and asphalt are not compatible. There is no obvious chemical reaction, but evenly dispersed and adsorbed in the asphalt, which is only a physical coexistence and fusion, and belongs to a thermodynamically incompatible system
Due to the formation of an unstable system, polymer modified asphalt will undergo polymer segregation during production, thermal storage and use, and its thermal storage stability is poor, so part of the asphalt paved on the pavement surface reaches If the adhesion is not as good as it should be, problems such as cracks will easily occur in the short term, and problems such as rutting will easily occur at high temperatures, and the final durability will not meet the expected requirements.

Method used

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  • Modified asphalt with heat storage stability and preparation method thereof
  • Modified asphalt with heat storage stability and preparation method thereof

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preparation example Construction

[0029] A preparation method of modified asphalt with thermal storage stability, specifically comprising the following steps:

[0030] First, heat the base asphalt to the molten state, add the composite additive at room temperature at a speed of 2000-3000r / min and stir evenly, then add the organic rectorite at 125-135°C, and then add the organic rectorite at 145-155°C at 3000- Shearing and stirring at a speed of 4000r / min for 1-2 hours, then adding a defoamer at a speed of 500-1000r / min and stirring evenly to obtain organic rectorite-modified asphalt.

[0031] Specifically, first heat the base asphalt to a molten state, add the composite additive at room temperature at a speed of 2000-3000r / min and stir for 3-5min; add a defoamer at a speed of 500-1000r / min and stir for 5-10min Finally, the organic rectorite modified asphalt is obtained.

[0032] Specifically, a stabilizer and a dispersant are sequentially added to the base asphalt.

[0033] Among them, the specific preparati...

Embodiment 1

[0035] Step 1: Take 500g of No. 90 petroleum asphalt and heat it to melt it completely, then add 0.5g of sulfur powder and 1g of sodium dodecylbenzene sulfonate with a particle size of 100 mesh to the molten asphalt at a speed of 2000r / min, and stir for 3 minutes until uniform, then add 5g of organic rectorite at 135°C, shear and stir at 145°C at a speed of 3000r / min for 1h, then add 0.25g of polydimethylsiloxane at a speed of 500r / min and After uniform stirring, the organic rectorite-modified asphalt is obtained.

Embodiment 2

[0037] Step 1: Take 500g of No. 90 petroleum asphalt and heat it to make it completely melted, then add 1g of sulfur powder and 2g of sodium dodecylsulfonate with a particle size of 90 mesh to the molten asphalt at a speed of 3000r / min, and stir for 5min until uniform , then add 10g of organic rectorite at 125°C, shear and stir at 155°C at a speed of 3000r / min for 2h, then add 0.4g of polyoxyethylene polyoxypropanolamine ether at a speed of 600r / min and After uniform stirring, the organic rectorite-modified asphalt is obtained.

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Abstract

The invention discloses modified asphalt with heat storage stability and a preparation method thereof. An organic reagent containing long-chain alkyls and a proper process are used for performing organizing on rectorite; then, the prepared organic rectorite is used for modifying the asphalt; in order to realize the more uniform and stable dispersion of the organic rectorite in the asphalt, composite additives are added; benzene ring groups of the organic agent have higher rigidity, the active points combined with the asphalt molecular chains are provided, the long-chain alkyls enable the rectorite to form a peeling type structure, so that the rectorite has larger specific area in an asphalt base body; the inhibition effect on the asphalt molecular chain motion is more obvious; meanwhile, through the benzyls and the long-chain alkyls, the rectorite has higher lipophilicity; the dispersion in the asphalt is easier, so that the obtained modified asphalt system has better excellent heat temperature stability, anti-aging performance and heat storage stability than the SBS modified asphalt; the heat storage stability is greatly improved.

Description

technical field [0001] The invention belongs to the technical field of novel modified asphalt materials, and in particular relates to a modified asphalt with thermal storage stability and a preparation method thereof. Background technique [0002] Asphalt binder is a typical viscoelastic material, and its performance is closely related to temperature. As the temperature rises, the asphalt binder gradually changes from an excellent thermoelastic state to a viscous fluid state, showing that the deformation resistance gradually weakens. For asphalt pavement, it is prone to problems such as shifting, blocking and rutting. Therefore, in order to delay the transition rate of asphalt from excellent heat to viscous flow state with temperature rise, so as to meet the requirements of excellent heat-temperature stability of pavement, it is necessary to modify ordinary asphalt. At present, the most commonly used modifiers are polymer modifiers, among which SBS has the best application ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L95/00C08K9/04C08K7/00C08K3/34C08K3/06C08K5/42C08K5/41C08J3/20
CPCC08J3/203C08L95/00C08L2201/08C08K2201/003C08J2395/00
Inventor 贾猛张增平朱永彪王封祁冰刘海婷
Owner CHANGAN UNIV
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