Asphalt modifier and asphalt composition comprising same

Abstract

The present invention relates to an asphalt modifier and an asphalt composition including the same, and more particularly, to an asphalt modifier capable of effectively improving low-temperature properties, high-temperature properties, storage stability, and the like of an asphalt composition due to excellent compatibility with the asphalt composition when a vinyl aromatic hydrocarbon-conjugated diene block copolymer containing a certain multifunctional group is used as the asphalt modifier, and an asphalt composition including the same.

Description

TECHNICAL FIELD[0001]This application claims the benefit of Korean Patent Application No. 10-2016-0137678, filed on Oct. 21, 2016, with the Korean Intellectual Property Office, the disclosure of which is herein incorporated by reference in its entirety.[0002]The present invention relates to an asphalt modifier having excellent compatibility with asphalt and an asphalt composition including the same.BACKGROUND ART[0003]Asphalt is a residue which is obtained after most of volatile oils in components of crude oil are evaporated, and has a physical property of being maintained in a liquid or semi-solid state having a high viscosity at a high temperature but being firmly hardened at a temperature less than or equal to room temperature.[0004]Because the asphalt has good plasticity, high water repellency, electrical insulating properties and adhesiveness, and chemically stable characteristics, the asphalt has been widely used for construction materials such as paving materials or waterproo...

AI Technical Summary

Benefits of technology

[0024]The asphalt modifier according to the present invention has excellent compatibility with asphalt as a certain multifunctional group is introduced into a vinyl aromatic hydrocarbon-conjugated diene block copolymer. Thus, when the asphalt modifier is used in an asphalt composition, workability can be remarkably improved, and various physical properties of asphalt, such as low-temperature and high-temperature properties, storage stability, and the like, can be effectively improved.

[0025]Hereinafter, the present invention will be described in further detail.

[0026]The terms and / or words used in this specification and the appended claims are not to be interpreted as limited to commonly used meanings or meanings in dictionaries and should be interpreted with meanings and concepts which are consistent with the technological scope of the present invention based on the principle that the present inventors have appropriately defined concepts of terms to describe the present invention in the best way.

[0027]To improve physical properties of an asphalt composition, a vinyl aromatic hydrocarbon-conjugated diene block copolymer is used as an asphalt modifier.

[0028]The asphalt composition is mainly composed of four components. Among these, a component having the worst compatibility with a vinyl aromatic hydrocarbon-conjugated diene block copolymer used as the asphalt modifier is asphaltene. Asphaltene is a highly concentrated aromatic hydrocarbon compound including polar functional groups having a number of heteroatoms in a chemical aspect. However, because the vinyl aromatic hydrocarbon-conjugated diene block copolymer used as the asphalt modifier contains no polar functional groups, the asphalt modifier has poor compatibility with the asphalt composition, resulting in degraded processability and workability. Also, the asphalt modifier is not sufficiently mixed with the asphalt composition, resulting in degraded quality, such as degraded elasticity, of asphalt.

[0029]To solve the above problems, a method of adjusting a molecular weight of a block copolymer or a method of adding a hydrophilic monomer, oil, and the like has been used in the prior art. However, such a method has a drawback in that the molecular weight of the block copolymer may decrease due to cleavage of chains thereof, and thus the physical properties of the asphalt composition may be rather degraded.

Problems solved by technology

However, the asphalt has drawbacks in that plastic deformation occurs during use when the asphalt is exposed to a high temperature for a prolonged period of time and cracking occurs at a low temperature due to external impacts.

When the vinyl aromatic hydrocarbon-conjugated diene block copolymer is used as the asphalt modifier, much time and cost are required to dissolve the block copolymer at a high temperature.

Because the asphaltene as an aggregate of aromatic hydrocarbons, includes a large amount of polar functional groups at the ends thereof, the asphaltene has very low compatibility with block copolymers having no polar functional groups.

Thus, a processing time or a manufacturing time of the asphalt may not only be remarkably extended, but a decline in quality of the asphalt, for example, a decrease in elasticity of modified asphalt, may also be caused.

Such patents have somewhat improved compatibility with the asphalt composition, but do not exhibit a sufficient improvement effect.

Also, the patents have no ultimate solution because there is a high variation in quality of asphalt according to crude oil and asphalt compositions obtained accordingly also have different modification effects.

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