Surface oxidation modification process for waste tire rubber powder for modification of asphalt

A technology of asphalt modification and surface oxidation, which is applied to building components, building insulation materials, buildings, etc., can solve the problems of poor compatibility, limit the transportation radius and storage time of modified asphalt, and achieve better wetting performance and easy industrialization Effect of application and improvement of bonding strength

Active Publication Date: 2013-06-12
NANKAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to factors such as poor compatibility between rubber powder and asphalt, the transportation radius and storage time of modified asphalt are limited.

Method used

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  • Surface oxidation modification process for waste tire rubber powder for modification of asphalt

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Take 200g waste tire rubber powder and 10g (5wt%) sodium dichloroisocyanurate and disperse in 600mL water. After stirring at a constant temperature of 25°C for 1.5 hours, the waste tire rubber powder was filtered, washed, and dried at 60°C until the quality was constant to obtain modified rubber powder. Modified rubber powder and No. 70 road asphalt were prepared by wet modification process, and the mixing amount of waste tire rubber powder was 21wt%. The 25°C penetration, 5°C ductility and softening point of the modified asphalt were tested. Among them, the penetration at 25°C is 36, the ductility at 5°C is 6.8, and the softening point is 74.3. The unmodified No. 70 road asphalt has a penetration of 43 at 25°C, a ductility of 8.1 at 5°C, and a softening point of 63.3. It can be seen that the penetration at 25°C and the ductility at 5°C are significantly reduced, and the softening point is significantly increased.

Embodiment 2

[0021] Take 200g waste tire rubber powder and 60g (30wt%) sodium dichloroisocyanurate and disperse in 600mL water. After stirring at a constant temperature of 25°C for 1.5 hours, the waste tire rubber powder was filtered, washed, and dried at 60°C until the quality was constant to obtain modified rubber powder. Modified rubber powder and No. 70 road asphalt were prepared by wet modification process, and the mixing amount of waste tire rubber powder was 21wt%. The 25°C penetration, 5°C ductility and softening point of the modified asphalt were tested. Among them, the penetration at 25°C is 35, the ductility at 5°C is 4, and the softening point is 66.3. The unmodified No. 70 road asphalt has a penetration of 43 at 25°C, a ductility of 8.1 at 5°C, and a softening point of 63.3. It can be seen that the penetration at 25°C and the ductility at 5°C are significantly reduced, and the softening point is increased.

Embodiment 3

[0023] Take 200g waste tire rubber powder and 20g (10wt%) trichloroisocyanuric acid and disperse in 600mL water. After stirring at a constant temperature of 25°C for 1.5 hours, the waste tire rubber powder was filtered, washed, and dried at 60°C until the quality was constant to obtain modified rubber powder. Modified rubber powder and No. 70 road asphalt were prepared by wet modification process, and the mixing amount of waste tire rubber powder was 21wt%. The 25°C penetration, 5°C ductility and softening point of the modified asphalt were tested. Among them, the penetration at 25°C is 27, the ductility at 5°C is 2, and the softening point is 71. The unmodified No. 70 road asphalt has a penetration of 43 at 25°C, a ductility of 8.1 at 5°C, and a softening point of 63.3. It can be seen that the penetration at 25°C and the ductility at 5°C are significantly reduced, and the softening point is significantly increased.

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Abstract

The invention relates to a surface oxidation modification process for waste tire rubber powder for modification of asphalt. The process comprises the following steps: dispersing waste tire rubber powder in water, adding a certain amount of oxidant, stirring at the temperature of 25-80 DEG C for 1.5 hours at constant temperature, wherein the oxidant is one of sodium dichloro isocyanurate, trichloroisocyanuric acid, sodium hypochlorite or hydrogen peroxide; the oxidant amount accounts for 3-30 percent of the mass of the waste tire rubber powder, filtering and drying to obtain the oxidized modified rubber powder after the reaction is ended, wherein the oxidized modified rubber powder serves as an asphalt modifier to prepare the rubber powder modified asphalt, so that the performance of the modified asphalt is regulated. The method is low in energy consumption, the oxidant is low in price and readily available, industrial application is easily realized, and the main performances such as the softening point, needle penetration and ductility of the modified asphalt can be effectively regulated.

Description

technical field [0001] The invention relates to a surface oxidation modification process of waste tire rubber powder for asphalt modification. Specifically, it is a process technology that oxidizes the surface of waste tire rubber powder through an oxidant to regulate the performance of rubber powder modified asphalt. Background technique [0002] my country is the country that produces the largest amount of waste tires in the world, with an annual output of more than 233 million pieces, or about 8.6 million tons. And with the explosive growth of my country's car ownership and sales in recent years, the production of waste tires in my country will continue to grow at a high speed in the future. But my country's rubber resources are very scarce, 75% of natural rubber and 45% of synthetic rubber need to rely on imports. Therefore, it is of great strategic significance to vigorously develop the comprehensive utilization technology of waste rubber resources to alleviate the sh...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08C19/04C08L95/00C08L15/00
Inventor 于凯王欢刘双喜陈小玉韩赫兴李瑞权伟杜鹃
Owner NANKAI UNIV
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