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Lake asphalt/SBR (styrene butadiene rubber) composite modifier and preparation method and application thereof

A compound modifier and lake asphalt technology, applied in the field of materials, can solve problems such as construction machinery failure, poor density, and reduced low-temperature ductility of modified asphalt, and achieve good aging resistance, high resistance, and improved aging resistance. Effect

Inactive Publication Date: 2017-06-27
FUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, since lake asphalt contains a large amount of asphaltene, resin and ash, adding it to the asphalt reduces the low-temperature ductility of the modified asphalt, so that the low-temperature crack resistance of the modified asphalt not only does not improve, but decreases significantly, resulting in the asphalt pavement It is prone to cracking in cold temperatures, which greatly shortens the service life of 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 The preparation method, but lake asphalt (or the composite of lake asphalt and rock asphalt) modified asphalt contains a large proportion of ash, because the ash and asphalt are not compatible and there is a density difference between the two, so the lake asphalt filled Modified asphalt is prone to segregation and precipitation during storage and transportation. Once severe ash separation occurs, the ash content in some lake asphalt modified asphalt at the bottom of the tank will be significantly larger. The effective asphalt content in asphalt will be too small, which will affect the effective asphalt content and production gradation in asphalt-modified asphalt mixture, especially the pass rate of sieve holes below 0.075 mm will be too high, which will seriously affect the road quality of asphalt mixture. Performance
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/SBR (styrene butadiene rubber) composite modifier and preparation method and application thereof
  • Lake asphalt/SBR (styrene butadiene rubber) composite modifier and preparation method and application thereof
  • Lake asphalt/SBR (styrene butadiene rubber) composite modifier and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Add 9 parts (parts by mass, the same below) of catalytic cracking oil slurry into the heat preservation container of the high-speed shear mixer, and heat it to about 160°C; start the high-speed shear mixer, set the speed at 800rmp, and add 85 parts of properly crushed lake Stir after asphalt for 15 minutes; then increase the speed to 2000rmp, add 6 parts of SBR and stir for 0.5 hours; finally, crush the prepared mixture at 5~10°C to particles with a particle size of no more than 1cm, that is, to obtain lake asphalt / SBR composite modifier pre-dispersion.

[0033] Add 79.9 parts of petroleum asphalt (penetration of 75dmm at 25°C and softening point of 45.2°C) into the heat preservation container of the high-speed shear mixer and heat it to about 160°C; start the high-speed shear mixer and set the speed to 3000rmp, and Add 20 parts of lake asphalt / SBR composite modifier pre-dispersion and 0.1 part of maleic anhydride to petroleum asphalt and stir for 0.5 hours; keep the t...

Embodiment 2

[0039]Add 20 parts of reduced third-line oil into the heat preservation container of the high-speed shear mixer, heat it to about 160°C; start the high-speed shear mixer, set the speed at 1200rmp, add 65 parts of appropriately broken lake asphalt, and stir for 30 minutes; then put Increase the rotation speed to 3000rmp, add 15 parts of SBR and stir for 0.5 hours; finally, the prepared mixture is crushed at 5~10°C to particles with a particle size of no more than 1cm, that is, the lake bitumen / SBR composite modifier pre-dispersion is obtained body.

[0040] Add 51 parts of petroleum asphalt (penetration of 84dmm at 25°C and softening point of 43.7°C) into the heat preservation container of the high-speed shear mixer and heat it to about 160°C; start the high-speed shear mixer and set the speed to 4000rmp, and Add 48 parts of lake asphalt / SBR composite modifier predispersion and 1 part of polyphosphoric acid into petroleum asphalt and stir for 1 hour; keep the temperature at 160...

Embodiment 3

[0046] Add 10 parts of catalytic cracking oil slurry and 7 parts of the third-line oil into the high-speed shear mixer insulation container, heat to about 160 °C; start the high-speed shear mixer, set the speed at 1500rmp, and add 70 parts of properly crushed lake asphalt Then stir for 35 minutes; then increase the rotation speed to 4000rmp, add 13 parts of SBR and stir for 1 hour; finally, the prepared mixture is crushed at 5~10°C to particles with a particle size of no more than 1cm, that is, lake asphalt / SBR composite modifier pre-dispersion.

[0047] Add 65 parts of petroleum asphalt (penetration at 25°C is 68dmm, softening point is 50.1°C) into the heat preservation container of the high-speed shear mixer, and heat it to about 160°C; start the high-speed shear mixer and set the speed to 2500rmp, and Add 34.5 parts of lake asphalt / SBR composite modifier predispersion and 0.5 parts of sulfur into petroleum asphalt and stir for 1 hour; keep the temperature at 160°C, reduce ...

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Abstract

The invention relates to a lake asphalt / SBR (styrene butadiene rubber) composite modifier and a preparation method and application thereof. The lake asphalt / SBR composite modifier is a pre-dispersed material formed by the lake asphalt, polymer SBR and a compatilizer via melt blending, and the modified asphalt can be obtained by melt blending of petroleum asphalt and a stabilizer. The lake asphalt / SBR composite modifier is the pre-dispersed material capable of remarkably improving capacities of high-temperature deformation, low-temperature cracking resistance and anti-water damage, the pre-dispersed material is then added to the petroleum asphalt, and the lake asphalt / SBR composite modified asphalt uniform in dispersion and less prone to layered segregation by the aid of the advantage of good compatibility of the pre-dispersed material and the petroleum asphalt; the modified asphalt is applied to construction of heavy traffic asphalt pavement of high-temperature, moist and rainy regions, asphalt pavement diseases can be remarkably reduced, pavement maintenance cost is lowered, and service life of the asphalt pavement is prolonged.

Description

technical field [0001] The invention belongs to the technical field of materials, and in particular relates to a lake asphalt / SBR composite modifier and its preparation method and application. Background technique [0002] Lake asphalt is composed of asphaltene, resin, oil and some insoluble matter. Its small penetration, high softening point and mineral ash make lake asphalt modified asphalt have good high temperature stability. Compared with polymer modified asphalt agents, it has better road performance such as high temperature resistance, water damage resistance, aging resistance and strong adhesion. Engineering practice shows that the modified asphalt using lake asphalt as a modifier prevents the occurrence of permanent deformation of asphalt pavement to a large extent due to its superior road performance. However, since lake asphalt contains a large amount of asphaltene, resin and ash, adding it to the asphalt reduces the low-temperature ductility of the modified asph...

Claims

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Application Information

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IPC IPC(8): C08L95/00C08L9/06C08L91/00C08K3/32C08K5/1539C08K3/06
CPCC08L95/00C08L2201/08C08L2205/025C08L2205/03C08L2205/035C08L2205/08C08L9/06C08L91/00C08K5/1539C08K2003/329C08K3/06
Inventor 徐松胡昌斌张峰徐波徐东
Owner FUZHOU UNIV
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