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High performance SBS modified asphalt and its making method

A technology for modifying asphalt and bitumen, which is used in building components, building insulation materials, buildings, etc., can solve the problems of excessive viscosity, high storage stability, and difficulty in storage stability, and is conducive to construction and storage stability. good effect

Inactive Publication Date: 2005-01-26
SHANGHAI QUNKANG ASPHALTUM TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] When using linear ordinary molecular weight SBS to prepare modified asphalt, when it reaches a higher softening point (such as 70 ℃), generally a higher dosage is required to meet the requirements of low temperature ductility at the same time; if using higher sulfur dosage, although lowering the dosage of SBS can obtain a higher softening point, but the low-temperature ductility cannot meet the standard, and the viscosity at 135°C may be too large; If the engineering requirements are higher than the specification requirements (such as the softening point is greater than 75C, and the ductility at 5°C after aging is greater than 20cm), it often occurs in production that the requirements cannot be met at the same time.
In addition, due to the high SBS content, the cost of SBS modified asphalt is very high, and the storage stability of SBS modified asphalt will sometimes be difficult to store due to the high SBS content.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Put 500g of Shell 90# asphalt in a 1-liter beaker, heat the asphalt to 180°C, then add 16.5g of SBS (PB-511, produced by Taiwan Chi Mei Industrial Co., Ltd., with an average molecular weight of 365,000) into the asphalt and use Mix in a high-speed shear emulsifier at 5000 rpm for 20 minutes, then transfer the beaker and the contents of the beaker to a strong mixer and stir for 20 minutes at 200 rpm, then slowly add 0.5 grams of Sulfur powder, continue to stir for 30 minutes, put the asphalt in a 163C oven and place it for 60 minutes to obtain modified asphalt, the properties are shown in Table 1:

Embodiment 2

[0021] Put 500g Shell 90# asphalt in a 1-liter beaker, heat the asphalt to 180°C, then mix 12gSBS (PB-511, produced by Taiwan Chi Mei Industrial Co., Ltd., with an average molecular weight of 365,000) and 5.5gSBS (PB- 5301, produced by Taiwan Chimei Industrial Co., Ltd., with an average molecular weight of 185,000) were added to the asphalt and mixed with a high-speed shear emulsifier at 5000 rpm for 20 minutes, and then the beaker and the contents in the beaker were transferred to a strong mixer Stir at 200 rpm for 20 minutes, then slowly add 0.55 g of sulfur powder within one minute, continue stirring for 30 minutes, put the asphalt in an oven at 163°C for 60 minutes, and obtain modified asphalt, the properties of which are shown in the table 1:

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PUM

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Abstract

Disclosed is a SBS modified asphalt material which is prepared by using star form SBS and linear SBS composition as the modifier, whose consumption is 2.0-10.0% of the asphalt weight, the weight ratio of the star form SBS and linear SBS is 50 : 50-100 : 0.

Description

technical field [0001] The invention relates to a modified asphalt material for road construction, in particular to a high-performance SBS modified asphalt and a preparation method thereof. Background technique [0002] The addition of copolymers has been used to improve the properties of bitumen for decades. Styrene butadiene triblock copolymer SBS is currently the most commonly used copolymer for improving the performance of asphalt. [0003] US4145322 discloses a method for preparing SBS (being styrene butadiene triblock copolymer) modified asphalt, heating the asphalt to the temperature of 130-230C, adding low molecular weight SBS, SBS is 2% of the asphalt weight -20%, with sulfur as a crosslinking agent. The disadvantage of this technology is that it does not use high-speed shearing equipment or colloid mill, and the time required for mixing is longer, and longer mixing time will affect the performance of modified asphalt. At the same time, for SBS with larger molecul...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J3/24C08L95/00
Inventor 黄卫东
Owner SHANGHAI QUNKANG ASPHALTUM TECH CO LTD
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