Method for preparing modified asphalt

A technology of modified asphalt and asphalt, which is applied in building components, building insulation materials, buildings, etc., can solve the problems of environmental pollution, poor compatibility, increased viscosity, etc., and achieve good storage stability, good construction performance, SBS The effect of low dosage

Inactive Publication Date: 2009-06-03
TONGJI UNIV
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  • Abstract
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Problems solved by technology

[0008] 3) Adding more sulfur will increase the viscosity of the prepared modified asphalt at a temperature of 135°C and above, thus increasing the difficulty of using asphalt for road construction and causing difficulty in asphalt pumping;
[0009] 4) Adding too much sulfur will result in lower ductility after aging, and the ductility after aging is an important indicator in the technical requirements of SBS modification in China
The addition of SBS in stages will also cause the following problems: firstly, it will greatly increase the processing time of modified asphalt; secondly, it will increase the difficulty of processing in large-scale industrial production: due to the poor compatibility of high molecular weight SBS with asphalt, it When adding asphalt, it must be crushed by high-speed shea

Method used

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  • Method for preparing modified asphalt
  • Method for preparing modified asphalt

Examples

Experimental program
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Effect test

example 1

[0030]Reference example 1: Heat 100 parts of Esso 90# asphalt to about 210°C, then add 3.3 parts of linear SBS (brand LCY-501, average molecular weight 171,000), and stir with a high-speed shear emulsifier at a speed of about 5000 rpm Disperse it in the asphalt for 15 minutes, remove the shear emulsifier and use a strong mixer to continue stirring the asphalt mixture for 40 minutes under the condition of 200 rpm, then add 0.1 parts of sulfur powder at one time, and continue stirring for 40 minutes. The modified asphalt was obtained, and the performance test results are shown in Table 1.

[0031] It can be seen from Table 1 that the softening point obtained by adding 3.3 parts of linear SBS is very low, and the ductility after aging is 0 cm.

example 2

[0033] Repeat the method of reference example 1, but the amount of sulfur is increased to 0.15 parts instead of 0.1 parts, and the performance test results are shown in Table 1.

[0034] It can be seen from Table 1 that the softening point has increased with the increase of sulfur content, but the ductility after aging is still 0 cm.

[0035] Reference example 3

[0036] Repeat the method of reference example 1, but the amount of linear SBS is increased to 5 parts instead of 3.3 parts. The performance test results are shown in Table 1.

[0037] It can be seen from Table 1 that the increase in the amount of SBS makes the softening point reach an ideal value (78°C), and the aging ductility is also ideal, but less than 20 cm. Pavement construction technical specification "JTJ036-98 requires 2.5 ℃; because the amount of SBS is increased to 5 parts, the cost will increase.

example 4

[0039] Repeat the method of reference example 3, but the amount of sulfur is increased to 0.15 parts instead of 0.1 parts, and the performance test results are shown in Table 1. The results of softening point and ductility after aging are very satisfactory, and the softening point after storage for 24 hours and 48 hours does not drop significantly, indicating that this is an ideal modified asphalt. But similar to reference example 3, because the dosage of SBS is higher, the cost is increased, and because the sulfur consumption is increased to 0.15 parts, the pollution to the environment increases during industrialized production.

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Abstract

The invention relates to the field of petrochemical industry, in particular to a method for preparing modified asphalt. The method for preparing the modified asphalt comprises the steps: the asphalt is heated up to 70-210 DEG C, star-shaped styrene butadiene styrene triblock copolymer is added as modifying agent for once, and evenly stirred; and then, cross linker sulfur is added again for once, and evenly stirred. The modified asphalt prepared by the method has the superior performances of high softening point, good low temperature ductility and storage stability, low SBS mixing quantity and sulfur mixing quantity, less environmental pollution, etc.

Description

technical field [0001] The invention relates to a method for preparing modified asphalt, in particular to a method for modifying asphalt by using star-shaped styrene-butadiene-styrene three-stage copolymer. Background technique [0002] The use of copolymers as modifiers to modify asphalt has a history of decades. SBS (Styrene Butadiene Styrene Triblock Copolymer) is currently the most commonly used modifier for improving the performance of asphalt. [0003] US4145322 discloses a method for modifying bitumen by using SBS, wherein for heating the bitumen to a temperature of 130-230°C, adding 2%-20% of the bitumen weight, SBS with a molecular weight of 30,000-300,000 to Sulfur is a crosslinking agent. The disadvantage of this scheme is that the molecular weight of SBS used is small, and the amount of SBS is relatively high, resulting in high cost; in addition, because it is only through simple mixing and does not use a class of strong dispersing equipment such as high-speed ...

Claims

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Application Information

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IPC IPC(8): C08L95/00C08L53/02C08K3/06C08J3/24
Inventor 黄卫东孙立军
Owner TONGJI UNIV
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