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High-ductility modified asphalt and preparation method thereof

A technology for modifying asphalt and ductility, which is applied in building components, building insulation materials, buildings, etc., and can solve problems such as ineffective improvement of low-temperature ductility, damage to molecular chain structure, and impact on SBS performance, and achieve good storage stability , Expand the scope of application, the effect of high crack resistance

Inactive Publication Date: 2016-01-20
CHINA PETROLEUM & CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method destroys the complete molecular chain structure of SBS, and the performance of SBS is affected to a certain extent; and this polar SBS is made by macromolecular secondary grafting reaction, the process is complicated, the production cost is high, and it is difficult to mass production
CN101041708A discloses a preparation method of terminal aminated SBS (SBS-N), which is used to modify asphalt. The preparation of functionalized SBS by this method will not destroy the integrity of the molecular chain of SBS itself, nor will it change the SBS The original synthesis process can significantly improve asphalt segregation and storage stability, but SBS-N has no obvious effect on improving low-temperature ductility. and

Method used

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  • High-ductility modified asphalt and preparation method thereof
  • High-ductility modified asphalt and preparation method thereof
  • High-ductility modified asphalt and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Ingredients: The mass percentages of each component are: base asphalt 94.5%, SBS-OH 4.3%; furfural oil 1%, BHS-2A 0.2%; base asphalt is 70# base asphalt; linear SBS-OH The average molecular weight is 80,000.

[0041] Take 70# base asphalt and heat it to 185±5°C to melt; then add furfural to extract oil and SBS-OH, stir and premix at 200r / min for 1h, and shear at 175±5°C for 25min at high speed, with a shear rate of 2500r / min ; After adding stabilizer (BHS-2A), continue high-speed shearing for 10 minutes, and then develop at 175±5°C for 4.5 hours at a stirring rate of 100r / min to obtain modified asphalt (see Table 4 for properties).

Embodiment 2

[0046] Ingredients: The mass percentages of each component are: base asphalt 94.5%, SBS-OH 4.3%; furfural oil 1%, BHT-2A 0.2%; base asphalt is 70# base asphalt; linear SBS-OH The average molecular weight is 100,000.

[0047] Take 70# base asphalt and heat it to 185±5°C to melt; then add furfural to extract oil and SBS-OH, stir and premix at 200r / min for 1h, and shear at 175±5°C for 25min at high speed, with a shear rate of 2500r / min ; After adding stabilizer (BHS-2A), continue high-speed shearing for 10 minutes, and then develop at 175±5°C for 4.5 hours at a stirring rate of 100r / min to obtain modified asphalt (see Table 4 for properties).

Embodiment 3

[0052] Ingredients: The mass percentages of each component are: base asphalt 94.5%, SBS-OH 4.3%; furfural oil 1%, BHT-2A 0.2%; base asphalt is 70# base asphalt; linear SBS-OH The average molecular weight is 120,000.

[0053] Take 70# base asphalt, heat it to 185±5℃ to melt; then add furfural extract oil and SBS-OH, stir and premix at 200r / min for 1h, and shear at 175±5℃ for 25min at a high speed, with a shear rate of 2500r / min min; After adding the stabilizer (BHS-2A), continue high-speed shearing for 10 min, and then develop at 175±5°C for 4.5 h at a stirring rate of 100 r / min to obtain modified asphalt (see Table 4 for properties).

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Abstract

The invention discloses high-ductility modified asphalt. The high-ductility modified asphalt is prepared from, by weight, 92%-96% of matrix asphalt, 3%-6% of linear terminal hydroxylation SBS, 0%-3% of compatilizer and 0.1%-0.4% of stabilizer. The invention further discloses a preparation method of the modified asphalt. The modified asphalt is high in ductility, good in crack resistance, wide in using temperature range, good in storage stability, capable of obviously improving the low-temperature cracking and fatigue resistance of a road surface and widening the application range, and beneficial to industrial production.

Description

technical field [0001] The invention relates to a modified asphalt, in particular to a high ductility modified asphalt. At the same time, the invention also relates to a preparation method of the modified asphalt. Background technique [0002] Modern highway traffic has heavy axle loads, large flow rates, and high tire pressure, which puts higher demands on the quality of the road surface. It is difficult for ordinary asphalt to meet the increasingly harsh environmental and technical requirements. This is due to the insurmountable characteristics of ordinary asphalt, such as low-temperature brittleness, high temperature sensitivity, and high-temperature flow, which cannot meet the requirements of high-speed highways. Therefore, people hope to improve or enhance the performance of some aspects of asphalt by adding some other substances. Polymer modified asphalt is the most widely used. Among them, styrene-butadiene-styrene block copolymer (SBS) has both properties of rubber...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L95/00C08L53/02C08L91/00
Inventor 李静静倪春霞许宏陈仕兵许晋国何荣庆杨文锋骆新平蔡伟钟向宏
Owner CHINA PETROLEUM & CHEM CORP
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