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Lake asphalt/SBS compound modifier and preparation method and application thereof

A technology of compound modifier and lake asphalt, which is applied in the field of materials, can solve the problems of low-temperature crack resistance of modified asphalt, high sieve pass rate, and construction machinery failure, etc., to achieve enhanced infiltration and adhesion capabilities, and improved Water damage resistance, improve the effect of high temperature deformation resistance

Inactive Publication Date: 2017-07-07
FUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although lake asphalt modified asphalt has many advantages above, since lake asphalt contains a large amount of asphaltene, resin and ash, adding it to petroleum asphalt reduces the low-temperature ductility of modified asphalt and makes the modified asphalt crack-resistant at low temperature Not only did not improve the performance, but significantly decreased, resulting in cracking of the asphalt pavement in cold temperatures, greatly shortening the service life of the asphalt pavement
[0003] Patent CN 101445659 B and Patent CN 101445658 B respectively disclose a lake asphalt modified asphalt and a natural composite (composed of lake asphalt and rock asphalt) modified asphalt, both of which provide modified asphalt with excellent road performance However, in engineering applications, it is found that lake asphalt (or a composite of lake asphalt and rock asphalt) modified asphalt contains a large proportion of ash, which is incompatible with asphalt and there is a density difference between the two, Therefore, the filled lake asphalt modified asphalt is prone to segregation and precipitation during storage and transportation. Once serious ash separation occurs, the ash content in the lake asphalt modified asphalt at the bottom of the tank will be significantly larger. , the effective asphalt content in the unit lake asphalt modified asphalt will be too small, which will affect the effective asphalt content and production gradation in the lake asphalt modified asphalt mixture, especially the passing rate of the sieve hole below 0.075 mm will be too large, thus seriously Affect the road performance of asphalt mixture
At the same time, segregation and precipitation can also easily cause nozzle clogging during mixing and injection, causing construction machinery failure and affecting the quality of mixing materials

Method used

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  • Lake asphalt/SBS compound modifier and preparation method and application thereof
  • Lake asphalt/SBS compound modifier and preparation method and application thereof
  • Lake asphalt/SBS compound modifier and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0031] Add 10 parts (parts by mass, the same below) of furfural extracted oil into the heat preservation container of the high-speed shear mixer and heat it to about 170°C; start the high-speed shear mixer, set the speed at 1000rmp, and add 82 parts of properly crushed lake asphalt Then stir for 20 minutes; then increase the temperature to 180°C, increase the speed to 3500rmp, add 8 parts of linear SBS and stir for 1 hour; finally crush the prepared mixture at 5~10°C until the particle size is not greater than 1cm The particles, that is, the lake asphalt / SBS composite modifier pre-dispersion is prepared.

[0032] Add 77.9 parts of petroleum asphalt (penetration of 70dmm at 25°C and softening point of 49.1°C) into the heat preservation container of the high-speed shear mixer and heat it to about 180°C; start the high-speed shear mixer and set the speed to 4000rmp, and Add 22 parts of lake asphalt / SBS composite modifier predispersion and 0.1 part of sulfur into petroleum asphalt...

Embodiment 2

[0038] Put 23 parts of catalytic cracking oil slurry into the heat preservation container of the high-speed shear mixer, and heat it to about 170°C; start the high-speed shear mixer, set the speed at 1500rmp, add 60 parts of appropriately broken lake asphalt, and stir for 30 minutes; then Raise the temperature to 180°C, increase the speed to 4000rmp, add 17 parts of star-shaped SBS and stir for 1.5 hours; finally, crush the prepared mixture at 5-10°C to particles with a particle size of no more than 1cm, which is obtained Lake bitumen / SBS composite modifier predispersion.

[0039] Add 56.5 parts of petroleum asphalt (penetration of 89dmm at 25°C and softening point of 45.8°C) into the heat preservation container of the high-speed shear mixer and heat it to about 180°C; start the high-speed shear mixer and set the speed to 4500rmp, and Add 42 parts of lake asphalt / SBS composite modifier predispersion and 1.5 parts of polyphosphoric acid into petroleum asphalt and stir for 45 mi...

Embodiment 3

[0045] Add 20 parts of epoxidized soybean oil into the high-speed shear mixer insulation container, heat to about 170°C; start the high-speed shear mixer, set the speed at 2000rmp, add 68 parts of appropriately broken lake asphalt and stir for 10 minutes; then Raise the temperature to 180°C, increase the rotation speed to 4500rmp, add 8 parts of linear SBS and 4 parts of star SBS and stir for 1 hour; finally, crush the prepared mixture at 5~10°C until the particle size is not larger than 1cm particles, that is, the lake asphalt / SBS composite modifier pre-dispersion is prepared.

[0046] Add 63 parts of petroleum asphalt (penetration of 78dmm at 25°C and softening point of 46.9°C) into the heat preservation container of the high-speed shear mixer and heat it to about 180°C; start the high-speed shear mixer and set the speed to 3000rmp, and Add 36 parts of lake asphalt / SBS composite modifier predispersion, 0.1 part of sulfur, and 0.9 part of polyphosphoric acid into petroleum as...

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Abstract

The invention relates to a lake asphalt / SBS compound modifier and a preparation method and application thereof. The lake asphalt / SBS compound modifier is a pre-dispersant which is prepared by the fusion and blending of lake asphalt, polymer SBS and compatilizers, and modified asphalt can be prepared by fusing and blending the lake asphalt / SBS compound modifier with petroleum asphalt and stabilizers. The obtained lake asphalt / SBS compound modifier is the pre-dispersant which can remarkably improve the high-temperature deformation resistance capability, low-temperature cracking resistance capability and water damage resistance capability of the petroleum asphalt, and by adding the pre-dispersant into the petroleum asphalt and taking use of the advantage of good compatibility between the pre-dispersant and the petroleum asphalt, the lake asphalt / SBS compound modified asphalt is prepared, wherein the modified asphalt is uniform in dispersion, and layered segregation does not occur easily on the modified asphalt. The modified asphalt is used for the construction of heavy-loaded traffic asphalt pavements in high temperature, damp and rainy areas, asphalt pavement diseases can be significantly reduced, the maintenance cost of the pavements is reduced, and the service life of the asphalt pavements is prolonged.

Description

technical field [0001] The invention belongs to the technical field of materials, and in particular relates to a lake asphalt / SBS composite modifier and a preparation method and application thereof. Background technique [0002] Since the beginning of the 21st century, my country's highway construction has developed rapidly. By the end of 2016, the total mileage of national highways had exceeded 130,000 kilometers, ranking first in the world. Among the built expressways, more than 90% are asphalt pavements. However, with the continuous growth of traffic volume, ordinary base asphalt has been difficult to meet the needs of high-grade asphalt pavement structure and modern traffic development, and it has been replaced by modified asphalt with better road performance. Lake asphalt is used to modify road asphalt because it has a chemical composition similar to petroleum asphalt and can endow petroleum asphalt with good high temperature stability. Compared with the commonly used...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L95/00C08L53/02C08L91/00C08K3/32C08K3/06
CPCC08L95/00C08L2201/08C08L2205/025C08L2205/03C08L2205/035C08L2205/08C08L53/02C08L91/00C08K3/06C08K2003/329
Inventor 徐松胡昌斌张峰徐波徐东
Owner FUZHOU UNIV
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