High-viscosity high-elasticity asphalt and preparation method thereof

A technology of modified asphalt and matrix asphalt, applied in building components, building insulation materials, construction and other directions, can solve the problems of high temperature performance impact of asphalt, large penetration of asphalt and high production cost, achieve low production cost, improve high and low temperature performance, the effect of improving compatibility

Active Publication Date: 2009-10-21
CHINA NAT OFFSHORE OIL CORP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Some existing asphalt products have disadvantages such as large penetration, soft asphalt, high production cost, etc., and there are also large differences in product stability and application effect
Patent 200510042781.1 discloses a modified asphalt material and a production process, using SBR, SB or SIS polymer modified asphalt to prepare the modified asphalt material for road stress absorption layer, but the stress absorption layer asphalt needle prepared by this process The penetration is large, and the asphalt is soft, which will have a certain impact on the high temperature performance of the asphalt

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Embodiment 1, preparation of high-viscosity high-elasticity asphalt

[0033] 83.9 parts by mass of base asphalt with a penetration (25°C, 0.1mm) of 68 (petroleum asphalt purchased from Zhonghai Asphalt Co., Ltd.) was first heated to 200°C; then 20 parts by mass of screened 60-mesh waste rubber was slowly added Powder (Huangshi No. 2 Rubber Factory), shear and stir for 30 minutes; cool down to 190°C, then add 6 parts by mass of SBS (molecular weight is about 150,000, purchased from Korea LG Company)) and 0.1 part by mass of crosslinking agent (sulfur and natural The asphalt mass ratio is 1:0.1), the temperature is kept constant, high-speed shearing and stirring for 2 hours, and high-viscosity and high-elasticity asphalt is obtained after cooling. Performance tests were carried out on the prepared asphalt products. The measured penetration (25°C, 0.1mm) of the asphalt product is 66, the softening point is 89.7°C, the ductility at 5°C is 40cm, the viscosity at 60°C is 340...

Embodiment 2

[0034] Embodiment 2, preparation of high-viscosity high-elasticity asphalt

[0035] 50 parts by mass of base asphalt with a penetration (25°C, 0.1mm) of 68 (petroleum asphalt purchased from Zhonghai Asphalt Co., Ltd.), first heated to 220°C; then slowly adding 30 parts by mass of screened 60-mesh waste rubber powder (Huangshi No. 2 Rubber Factory), shear and stir for 30 minutes; cool down to 185 ° C, then add 8 parts by mass of SBS (molecular weight is about 150,000, purchased from Korea LG Company) and 12 parts by mass of crosslinking agent (sulfur and natural asphalt) Ratio 1:20), keep the temperature constant, high-speed shearing and stirring for 2 hours, after cooling, high-viscosity and high-elasticity asphalt is obtained. Performance tests were carried out on the prepared asphalt products. The measured penetration (25°C, 0.1mm) of the asphalt product is 66, the softening point is 85.3°C, the ductility at 5°C is 46cm, the viscosity at 60°C is 38000Pa.s, and the elastic r...

Embodiment 3

[0036] Embodiment 3, preparation of high-viscosity high-elasticity asphalt

[0037] 92 parts by mass of base asphalt with a penetration (25°C, 0.1mm) of 68 (petroleum asphalt purchased from Zhonghai Asphalt Co., Ltd.), first heated to 220°C; then slowly adding 2 parts by mass of screened 60-mesh waste rubber powder (Huangshi No. 2 Rubber Factory), shear and stir for 30 minutes; cool down to 185 ° C, then add 6 parts by mass of SBS (molecular weight of about 300,000, purchased from Yueyang Petrochemical Company) and 1 part by mass of crosslinking agent (sulfur and natural asphalt) Ratio 1:1), keep the temperature constant, high-speed shearing and stirring for 2 hours, after cooling, high-viscosity and high-elasticity asphalt is obtained. Performance tests were carried out on the prepared asphalt products. The measured penetration (25°C, 0.1mm) of the asphalt product is 66, the softening point is 96.7°C, the ductility at 5°C is 52cm, the viscosity at 60°C is 32000Pa.s, and the ...

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Abstract

The invention discloses high-viscosity high-elasticity asphalt and a preparation method thereof. The high-viscosity high-elasticity asphalt is prepared from the following components by mass portion: 50 to 92 portions of asphalt matrix; 8 to 40 portions of additives and 0.1 to 12 portions of crosslinking agent, wherein the additives are rubber powder and styrene-butadiene-styrene block copolymer; the mass ratio of the rubber powder to the rubber powder and styrene-butadiene-styrene block copolymer is (0.5-35):(3-12); and the crosslinking agent is sulfur and natural asphalt; the mass ratio of the sulfur to the natural asphalt is 1:(0.1-20). The dynamic viscosity of the high-viscosity high-elasticity asphalt is 20,000 to 40,000 Pa.S at 60 DEG C; and the elastic recovery of the high-viscosity high-elasticity asphalt is greater than 90 percent at 25 DEG C. The modified asphalt can be used as a transition layer between a cracking structural layer and an asphalt surface coat / asphalt overlay to achieve the aims of dispersing and absorbing concentrated stress at crack tips, thereby solving the problem of reflection crack diseases.

Description

technical field [0001] The invention relates to a high-viscosity and high-elasticity asphalt and a preparation method thereof. Background technique [0002] With the development and improvement of China's road network, many roads have entered the stage of maintenance and renovation. Whether it is maintenance of old roads or upgrading of low-grade roads, it is a common measure to add new asphalt surfaces to the original roads. If no corresponding preventive measures are taken, the transverse cracks, longitudinal cracks, cracks, board corner cracks and structural joints of the original old pavement will be quickly reflected on the asphalt overlay surface, forming reflection cracks, which will lead to more serious damage. destroy. In order to solve reflective cracks, stress absorbing layer technology is usually used, which requires asphalt materials to have good high temperature stability, low temperature flexibility and elastic recovery ability, softening point greater than 7...

Claims

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Application Information

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IPC IPC(8): C08L95/00C08K3/06C08L53/02C08L21/00
Inventor 张玉贞刘延军
Owner CHINA NAT OFFSHORE OIL CORP
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