Method for preparing modified asphalt

A technology of modified asphalt and asphalt, which is applied in the field of preparation of modified asphalt, can solve the problems of no change in molecular structure, segregation and delamination, poor flexibility, etc., to improve temperature sensitivity, overcome segregation and delamination, and improve flow resistance sexual effect

Inactive Publication Date: 2009-04-01
JURONG NINGWU SCI & TECH DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantages of this asphalt modification method are: because the modifier is simply added to the asphalt for physical blending, the problem of segregation and stratification is easy to occur, and the asphalt has strong temperature sensitivity, low viscosity, and poor flexibility. Although some problems have been improved, there is no fundamental change in the molecular structure.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Add 100 parts of petroleum pitch heated to 90-130°C (mass, the same below) into the reactor, add 0.3 parts of benzoyl peroxide, then add 9 parts of methacrylic acid, 1 part of styrene and N-phenyl maleic acid 1 part of imide, control the temperature at 120-135 ° C, and feed N2 to keep the pressure of the reactor at 0.2 MPa, react for 3 hours, then degas for 20 minutes, and filter to obtain modified asphalt with greatly improved low-temperature toughness.

Embodiment 2

[0016] Add 100 parts of petroleum asphalt heated to 90-130°C into the reactor, add 0.05 parts of ammonium persulfate, then add 1 part of maleic anhydride, 0.05 parts of glycidyl methacrylate and 0.1 parts of N-phenylmaleimide Control the temperature to 130-160 ° C, and feed N2 to keep the pressure of the reactor at 0.4 MPa, react for 6 hours, then degas for 20 minutes, and filter to obtain modified asphalt with greatly improved high-temperature rheological properties.

Embodiment 3

[0018] Add 100 parts of oxidized asphalt heated to 80-100°C into the reactor, add 0.1 part of potassium persulfate, then add 1 part of acrylic acid, 0.2 parts of α-methylstyrene and 0.2 parts of N-phenylmaleimide, Control the temperature to 120-150°C, and feed N2 to keep the pressure of the reactor at 0.1 MPa, react for 4 hours, then degas for 20 minutes, and obtain modified asphalt after filtration.

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PUM

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Abstract

The invention discloses a preparation method of modified asphalt. The modified asphalt is produced by asphalt and an undersaturation double bond compound which are reacted under the action of an evocating agent; the method comprises the following steps: firstly, the asphalt is put into a reaction kettle; the evocating agent is added into the reaction kettle; the weight of the evocating agent is 0.05-1 percent of the weight of the asphalt; the undersaturation double bond compound with the weight of 1-10 percent of that of the asphalt and 0.1-1 percent of N-phenyl maleimide are added into the reaction kettle at the temperature of 80-160 DEG C; and the pressure remains 0.1-0.4 MPa. The reaction is carried out for 3-6 hours; the reaction product is deaerated and filtered, and then the modified asphalt is obtained. The chemically modified asphalt provided by the method has good performance, which greatly improves the shortcomings that the common asphalt has strong temperature sensibility, low viscosity, poor flexility and the like. The modified asphalt can meet the use performance of roads and prolong the service life of roads; when the modified asphalt is used in road maintaining, maintenance, the time of traffic closing is shortened, the construction condition is improved and the construction efficiency is increased.

Description

technical field [0001] The invention relates to a preparation method of modified asphalt, which belongs to asphalt chemical modification technology. Background technique [0002] Asphalt is widely used in road paving, road repair and maintenance. Compared with cement concrete pavement, asphalt pavement has the advantages of seamless, comfortable driving, small vibration and low noise. However, ordinary asphalt has strong temperature sensitivity, low viscosity, and poor flexibility, which brings a lot of inconvenience to use. In order to overcome the disadvantages of ordinary asphalt, research on asphalt modification has been carried out at home and abroad. Modified asphalt is to add modifiers to asphalt to improve the performance of asphalt or asphalt mixture. Among them, the modifiers are mostly: rubber, resin, high molecular polymer, finely ground rubber powder or other fillers. The disadvantages of this asphalt modification method are: because the modifier is simply add...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F289/00C04B26/26
Inventor 应珏翟洪金应军
Owner JURONG NINGWU SCI & TECH DEV
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