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Polymer modification asphalt cement for open-Graded pavement and its preparation method

A technology for modifying asphalt and polymers, used in graded roads, the preparation of this composition, the field of high-viscosity polymer-modified asphalt compositions, can solve problems such as poor stability, and achieve strong water damage resistance and good storage stability. , The effect of good viscosity and toughness

Active Publication Date: 2006-05-03
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The viscosity and viscous toughness indicators of the above-mentioned asphalt binder are still relatively low for paving open-graded pavement (the viscosity is generally less than 80000Pa s), and during the high-temperature heat storage, the polymer is easy to gradually precipitate from the asphalt, and the stability is poor

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Take 90 grams of asphalt A and 510 grams of asphalt B and inject them into a 1-liter cylindrical container. After heating to 170 ° C, add 48 grams of SBS and 24 grams of SBR, and use a high-shear mixer emulsifier to continuously shear at high speed for 60 minutes until the polymer Uniformly disperse in asphalt, add 0.9 grams of sublimated sulfur (Tianjin Fuchen Chemical Reagent Factory) in average three times during the shearing process, and keep the reaction temperature at 180°C, put the dispersed polymer asphalt composition into a 160°C oven After standing in the middle for 20 hours, the polymer modified asphalt composition of the present invention was obtained. As can be seen from the product property analysis results in Table 1, the performance of the prepared composition meets the technical indicators required by the present invention.

Embodiment 2

[0026] Take 90 grams of asphalt A and 510 grams of asphalt B and inject them into a 1-liter cylindrical container. After heating to 170 ° C, add 36 grams of SBS and 18 grams of SBR, and use a high-shear mixer emulsifier to continuously shear at high speed for 40 minutes until the polymer Uniformly disperse in asphalt, keep the reaction temperature at 170°C, add 0.72 grams of sublimated sulfur at one time when the shearing is about to end, put the dispersed polymer asphalt composition into an oven at 170°C and let it stand for 6 hours, and obtain the present invention polymer modified asphalt compositions. As can be seen from the product property analysis results in Table 1, the performance of the prepared composition meets the technical indicators required by the present invention.

Embodiment 3

[0028] Take 90 grams of asphalt A and 510 grams of asphalt B into a 1-liter cylindrical container, heat to 150 ° C, add 30 grams of SBS, 18 grams of SBR and 0.48 grams of sublimated sulfur, and use a high-shear mixing emulsifier to continuously shear at high speed After 40 minutes until the polymer is uniformly dispersed in the asphalt, and the reaction temperature is maintained at 180°C, the dispersed polymer asphalt composition is placed in an oven at 180°C and left to stand for 2 hours to obtain the polymer modified asphalt composition of the present invention . As can be seen from the product property analysis results in Table 1, the performance of the prepared composition meets the technical indicators required by the present invention.

[0029] project

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PUM

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Abstract

The invention discloses a polymer modified asphalt cementing material for open-graded pavement, which comprises asphalt, thermoplastic elastomer and rubber polymer. The preparation method comprises: on condition of high-speed shear, dispersing the polymer and crosslinking agent in alphalt to store for 2~24h at high temperature. This product has characters as following: 40~801 / 10mm penetration at 25Deg, 70~110Deg softening point, 80000~3000000Paíñs viscosity at 60Deg, tenacity more than 25Níñm, toughness more than 20Níñm, difference of softening points in resolution testing less than 2.5Deg.

Description

technical field [0001] The present invention relates to a road asphalt binder, more particularly to a storage-stable high-viscosity polymer-modified asphalt composition suitable for paving high-grade roads, especially open-graded road surfaces. The invention also relates to a process for preparing the composition. Background technique [0002] Bitumen has been used as a road paving material for more than a hundred years. With the continuous progress of science and technology, great changes have taken place in the pavement structure and its requirements on the performance of road asphalt. Open-graded pavement is a relatively advanced pavement structure developed in recent decades, and it is usually used as the surface course of high-grade highways. Due to the high content of coarse aggregate and low content of fine aggregate and filler, the void ratio of open-graded pavement usually approaches or exceeds 20%. This special pavement structure can absorb rainwater into the pa...

Claims

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Application Information

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IPC IPC(8): C08L95/00E01C7/20
Inventor 李志军宁爱民程国香
Owner CHINA PETROLEUM & CHEM CORP
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