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Composite of modified road asphalt by microwave radiating old rubber powder and its preparation process

A technology of waste rubber powder and microwave irradiation, which is applied in the direction of building structure, building components, building insulation materials, etc., can solve the problems of high content of asphalt wax, poor road performance, strong sensitivity, etc.

Inactive Publication Date: 2005-03-23
NORTHWEST NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

According to the national "Tenth Five-Year" plan and the 2010 development plan outline, the next 10 years will be a period of great development in my country's highway construction. Only highway construction will require more than 5 million tons of high-performance road asphalt every year, and more than 80% of domestic crude oil belongs to Paraffin-based crude oil, resulting in high content of asphalt wax, low elongation and consistency, strong sensitivity to temperature, soft in summer and brittle in winter, poor road performance, and cannot meet the requirements of high-grade highway construction. modified asphalt

Method used

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  • Composite of modified road asphalt by microwave radiating old rubber powder and its preparation process
  • Composite of modified road asphalt by microwave radiating old rubber powder and its preparation process
  • Composite of modified road asphalt by microwave radiating old rubber powder and its preparation process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Example 1, first use 2% trioctyl phosphate to pre-swell 5% waste rubber powder (80 mesh) for 40 hours, then put the rubber powder into a 360W microwave oven for 4 minutes, and then irradiate a certain amount of Add the over-processed waste rubber powder into 90% molten base asphalt, and keep stirring to avoid local overheating. While stirring, add 3% powdered styrene-butadiene rubber (SBR), make the melting temperature reach 160°C in a high-shear asphalt emulsifier, and stir for 40 minutes at a shear rate of 4500rpm / min to make it evenly blended, that is Modified bitumen is available. The measured 5-degree elongation (5cm / min, 5°C, cm) is 45, the 25-degree penetration (25°C, 100g, 5s, o.1mm) is 90, and the softening point (°C) is 50; Rotary film oven After the experiment (RTFOT), the 5-degree ductility (5cm / min, 5°C, cm) was 38, and the penetration ratio (%) was 78.

Embodiment 2

[0027] Example 2, 8% waste rubber powder (80 mesh) was pre-swelled with 2% dioctyl sebacate for 40 hours, then 3 minutes with 900W microwave irradiation, and then the rubber powder irradiated by microwave Put it into 86% molten matrix asphalt, add 4% powdered styrene-butadiene rubber (SBR) in the process of continuous stirring, continue to maintain the temperature to 180 ° C, and stir for 60 minutes at a shear rate of 4500r / min to make it total Mix evenly to get modified asphalt. The measured 5-degree ductility (5cm / min, 5°C, cm) is 40, the 25-degree penetration (25°C, 100g, 5s, 0.1mm) is 85, and the softening point (°C) is 50; rotating film oven test After (RTFOT), the 5-degree ductility (5cm / min, 5°C, cm) is 40, and the penetration ratio (%) is 80.

Embodiment 3

[0028] Example 3, use 3% heavy oil to pre-swell 5% waste rubber powder (80 mesh) for 40 hours, then put the rubber powder into a 540W microwave oven for 2 minutes, and then add the rubber powder irradiated by microwaves Add 2% powdered styrene-butadiene rubber (SBR) to 88% molten base asphalt while stirring, keep the temperature up to 170°C, and stir for 40 minutes at a shear rate of 4500r / min to make it evenly blended, and the improved Sexual asphalt. The measured 5-degree ductility (5cm / min, 5°C, cm) is 49, the 25-degree penetration (25°C, 100g, 5s, o.1mm) is 92, and the softening point (°C) is 50; Rotary film oven After the experiment (RTFOT), the 5-degree ductility (5cm / min, 5°C, cm) was 39, and the penetration ratio (%) was 77.

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Abstract

The invention relates to a microwave-irradiated waste-rubber powder modified pitch combination and its preparing method, using higher-wax content pitch as a substrate, adding in powdery butadiene-styrene rubber and microwave-irradiated waste rubber powder, and making high-speed cutting and uniform commixing to make the modified pitch. The modified pitch has the characters of high-temperature stability, obviously increased low-temperature extensibility, good antiaging property, etc, has road performance synthetically improved and can act as high-grade road pitch for use.

Description

technical field [0001] The invention relates to a new technology for modifying road asphalt by using microwave irradiation waste rubber powder. Background technique [0002] In the 1980s, Sulter and Snim-ton found that modifying asphalt with 7% waste rubber powder would increase the load strength of the road, and the brittle point of the modified system would decrease by 1 °C for every additional waste rubber powder; Since the vulcanized rubber powder has been mixed with various stabilizers (including antioxidants, vulcanizing agents, carbon black and zinc oxide), it is beneficial to improve the adsorption and weather resistance of asphalt. In 1991, Fromm et al. found that adding waste rubber to asphalt can improve the stability of asphalt, increase the adhesion with the base material, and improve the anti-skid and wear resistance of the road. In 1992, Anderston successfully developed modified asphalt containing 16% waste rubber powder. After asphalt is modified, its visco...

Claims

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Application Information

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IPC IPC(8): C08J11/00C08L95/00
Inventor 王云普刘小军李玉峰张继袁昆
Owner NORTHWEST NORMAL UNIVERSITY
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