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Rubber asphalt and preparation method thereof

A technology of rubber asphalt and rubber, which is applied in the field of rubber asphalt and its preparation, can solve the problems of re-aging of active groups, affecting the service life of the road surface, and long production cycle, and achieve chemical stability of the colloid system, enhanced workability, and good compatibility effect

Active Publication Date: 2016-07-06
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the use of rubber powder activation, desulfurization and other methods has improved the problems of compatibility and stability to a certain extent and achieved certain results, but there are still problems such as complex process, long production cycle, and large equipment investment, and rubber asphalt and ordinary asphalt There is also the problem of aging. The aging of asphalt is a gradual process, and its rate directly affects the service life of the pavement. Environmental factors such as sunlight, oxygen, water, and temperature changes will cause a series of physical and chemical changes, mainly due to the decrease of aromatic oil and the increase of asphaltene, which will change the colloidal structure of asphalt and cause re-aging problems. , which affects the road performance of asphalt. After the rubber powder is desulfurized and activated, the regenerated active groups bring the problem of re-aging

Method used

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  • Rubber asphalt and preparation method thereof
  • Rubber asphalt and preparation method thereof
  • Rubber asphalt and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] Heat the mixture of No. 30 straight-run asphalt with 78.4% of the total mass of rubber asphalt and No. 90 blended asphalt (weight ratio 3:7) to 120°C on a heating mantle, and add 80 mesh waste with 21% of the total mass of rubber asphalt while stirring. Tire rubber powder and 0.1% n-dodecanethiol were stirred at a speed of 1300 rpm for 5 minutes to form a uniformly mixed mixture. When the temperature rises to 180°C, use a high-shear dispersing emulsifier for high-speed shearing and stirring for 15 minutes. During the shearing process, the temperature is controlled at (180±3)°C, and the speed is 3000 rpm, and then the total mass of rubber asphalt is added. 0.5% mixture of 6-ethoxy-2,2,4-trimethyl-1,2-dihydroquinoline and 3-hydroxybutyraldehyde-α-naphthylamine (ratio 1:1) with a stirrer Stirring, the temperature is controlled at (180±3)°C during the stirring reaction process, and the stirring time is 3 hours to obtain the finished rubber asphalt.

Embodiment 2

[0058] Heat No. 70 blended asphalt with 75% of the total mass of rubber asphalt to 130°C on a heating mantle, add 60 mesh waste tire rubber powder with 24% of the total mass of rubber asphalt and 0.5% rubber activator 480 while stirring, and the speed is 1300 rpm and stir for 10 minutes to form a well-mixed mixture. When the temperature rises to 180°C, use a high-shear dispersing emulsifier for high-speed shearing and stirring for 10 minutes. During the shearing process, the temperature is controlled at (180±3)°C, and the speed is 4000 rpm, and then the total mass of rubber asphalt is added. The mixture of 0.5% acetaldehyde-α-naphthalene condensate and N-phenyl-α-naphthylamine (ratio 1:1) is stirred with a stirrer, and the temperature is controlled at (180±3)°C during the stirring reaction, and the stirring The time is 3 hours, and the rubber asphalt finished product is obtained.

Embodiment 3

[0060] Heat No. 50 oxidized asphalt with 75.5% of the total mass of rubber asphalt to 150°C on a heating mantle, and add 60 mesh waste tire rubber powder with 23% of the total mass of rubber asphalt and 0.5% of xylene disulfide and phenol disulfide while stirring. The mixture of sulfides (ratio 1:1) was stirred at 1000 rpm for 10 minutes to form a well-mixed mixture. When the temperature rises to 180°C, use a high-shear dispersing emulsifier for high-speed shearing and stirring for 15 minutes. During the shearing process, the temperature is controlled at (180±3)°C, and the speed is 3000 rpm, and then the total mass of rubber asphalt is added. The mixture (ratio 1:1) of 1% acetaldehyde-α naphthalene condensate' and N-phenyl-β-naphthylamine is stirred with a stirrer, and the temperature is controlled at (180±3)°C during the stirring reaction, The stirring time is 2 hours, and the rubber asphalt product is obtained.

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Abstract

The invention relates to rubber asphalt. The rubber asphalt is compounded from the following ingredients: base asphalt, waste rubber powder, an activating and recycling agent and a fixing and anti-aging agent. Accounted by total weight of the rubber asphalt, per 100% of the rubber asphalt comprises the ingredients in the following percentage: 70-89.4% of the base asphalt, 10-29.4% of the waste rubber powder, 0.1-1% of the activating and recycling agent and 0.5-1.5% of the fixing and anti-aging agent. A preparation method of the rubber asphalt comprises the following steps: heating the base asphalt to 120-160 DEG C; slowly adding the waste rubber powder and the activating and recycling agent into the heated base asphalt according to a certain proportion in a reaction kettle while stirring, wherein stirring speed is 300-1500 round / minute and stirring time is 5-20 minutes; raising temperature of the mixture to 170-180 DEG C, and performing high-speed shearing on the heated mixture by a shearing machine or a colloid mill for 5-30 minutes, wherein the shearing speed is 3000-5000 round / minute; and adding the fixing and anti-aging agent into the mixture and reacting the mixture while stirring for 2-5 hours. Compatibilities of the rubber powder and the asphalt are improved by the preparation method, so that the problem of instabilities of rubber asphalts in high-temperature storage is solved.

Description

technical field [0001] The invention relates to the technical field of road construction materials, in particular to a rubber asphalt and a preparation method thereof. Background technique [0002] Asphalt is an important road and construction material. In recent years, the rapid development of social economy has promoted the rapid improvement of the transportation industry and various grades of asphalt roads, which has led to the improvement of the performance requirements of asphalt pavement. Ordinary asphalt pavement is highly sensitive to temperature, and has disadvantages such as brittleness at low temperature, easy softening at high temperature, poor elasticity, and poor aging resistance. It is difficult to meet the requirements of modern high-grade highways for high and low temperature performance. Modification of asphalt. [0003] The so-called modified asphalt, according to the definition of my country's "Technical Specifications for Highway Modified Asphalt Pavem...

Claims

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Application Information

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IPC IPC(8): C08L95/00C08L21/00C08L17/00C08J11/10C08J11/28
CPCY02W30/62
Inventor 吕文姝王金勤蔺习雄熊良铨张艳莉
Owner PETROCHINA CO LTD
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