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Asphalt composition containing styrene-butadiene-styrene block copolymer having asymmetric polystyrene block

a technology of styrene butadiene and polystyrene, which is applied in the field of modified asphalt compositions, can solve the problems of fatigue cracks at the bottom of asphalt, the asphalt composition is often not suitable for all applications, and the conventional bitumen asphalt composition can not meet all requirements, etc., and achieve excellent ductility and thermal stability.

Inactive Publication Date: 2006-10-26
KOREA KUMHO PETROCHEMICAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0020] The object of the present invention is to provide a modified asphalt composition containing asymmetric styrene-butadiene-styrene triblock copolymer as modifier showing excellent ductility and thermal stability at low temperature and the resistance to permanent deformation at high temperature.

Problems solved by technology

Conventional bitumen asphalt compositions frequently can not meet all of the requirements, when it is used for pavement of road or manufacturing water-proof sheet.
Further, at high temperature, the permanent deformation of asphalt composition can occur due to high temperature and high pressure.
Also, at low temperature, the fatigue crack can occur at the bottom of asphalt by repeated weight pressure whereas the cracking can occur at the top of asphalt by repeated tensile strength according to rapid change of temperature.
Further, a natural asphalt composition has the drawbacks by declining the resistance against permanent deformation, thermal sensitivity, fatigue crack and / or low temperature crack according to the lapse of time and increase of vehicles after pavement of road.
Of course, the crack of asphalt caused by pressure fatigue or thermal deformation is also declined if the ductility of asphalt composition increases.
However, despite of economical advantage, the physical properties for asphalt modifier is less than those of styrene-butadiene block copolymer rubber.
However, the application of this modifier has to be restricted due to its high melting point and high cost.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example 1

Preparation of Asymmetric Styrene-butadiene-styrene Triblock Copolymer

[0044] 2L of reactor is fully purged with argon gas. Then, 900 g of purified cyclohexane and 20 g of styrene are added with maintaining the temperature at 70° C. Cyclohexane solution (1.3 M concentration) containing 2 mmol of n-butyllithium(BuLi) as initiator is added to reactor, and polymerization reaction is initiated. After 10 minutes lapse at the highest polymerization temperature, 170 g of butadiene is added to initiate polymerization. After 5 minutes lapse at the highest polymerization temperature, 10 g of styrene is added to initiate polymerization. The polymerization is terminated by addition of a small amount of methanol to reaction solution. After completely removing the activity of leaving polymer, addition of anti-oxidant is carried out.

[0045] The removal of solvent in the obtained polymer mixture solution is carried out using steam. Then, cream type of asymmetric styrene-butadiene-styrene triblock c...

preparation example 2

Preparation of Asymmetric Styrene-butadiene-styrene Triblock Copolymer

[0046] 2L of reactor is fully purged with argon gas. Then, 900 g of purified cyclohexane and 25 g of styrene are added with maintaining the temperature at 70° C. Cyclohexane solution (1.3 M concentration) containing 2 mmol of n-butyllithium(BuLi) as initiator is added to reactor, and polymerization reaction is initiated. After 10 minutes lapse at the highest polymerization temperature, 170 g of butadiene is added to initiate polymerization. After 5 minutes lapse at the highest polymerization temperature, 5 g of styrene is added to initiate polymerization. The polymerization is terminated by addition of a small amount of methanol to reaction solution. After completely removing the activity of leaving polymer, addition of anti-oxidant is carried out.

[0047] The removal of solvent in the obtained polymer mixture solution is carried out using steam. Then, cream type of asymmetric styrene-butadiene-styrene triblock co...

preparation example 3

Preparation of Asymmetric Styrene-butadiene-styrene Triblock Copolymer

[0048] 2L of reactor is fully purged with argon gas. Then, 900 g of purified cyclohexane and 28 g of styrene are added with maintaining the temperature at 70° C. Cyclohexane solution (1.3 M concentration) containing 2 mmol of n-butyllithium(BuLi) as initiator is added to reactor, and polymerization reaction is initiated. After 10 minutes lapse at the highest polymerization temperature, 170 g of butadiene is added to initiate polymerization. After 5 minutes lapse at the highest polymerization temperature, 2 g of styrene is added to initiate polymerization. The polymerization is terminated by addition of a small amount of methanol to reaction solution. After completely removing the activity of leaving polymer, addition of anti-oxidant is carried out.

[0049] The removal of solvent in the obtained polymer mixture solution is carried out using steam. Then, cream type of asymmetric styrene-butadiene-styrene triblock co...

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Abstract

The present invention provides a modified asphalt composition showing excellent ductility and thermal stability at low temperature and the resistance to permanent deformation at high temperature comprising i) 100 wt. part of natural asphalt; and ii) 0.5˜40 wt. part of asymmetric styrene-butadiene-styrene triblock copolymer having number average molecular weight of 20,000˜1,000,000. Modified asphalt composition of present invention can be used for pavement of road or manufacturing water proof sheet.

Description

FIELD OF THE INVENTION [0001] The present invention relates to a modified asphalt composition containing asymmetric styrene-butadiene-styrene triblock copolymer as modifier. More particularly, this invention relates to a modified asphalt composition containing asymmetric styrene-butadiene-styrene triblock copolymer showing an excellent balance of ductility at low temperatures and high flow resistance at high temperatures. BACKGROUND OF THE INVENTION [0002] Conventional bitumen asphalt compositions frequently can not meet all of the requirements, when it is used for pavement of road or manufacturing water-proof sheet. Further, at high temperature, the permanent deformation of asphalt composition can occur due to high temperature and high pressure. Also, at low temperature, the fatigue crack can occur at the bottom of asphalt by repeated weight pressure whereas the cracking can occur at the top of asphalt by repeated tensile strength according to rapid change of temperature. Further, ...

Claims

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Application Information

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IPC IPC(8): E01C7/26
CPCC08L53/02C08L95/00E01C7/265C08L53/00C08L2666/24C08L25/08C08L2555/84
Inventor KIM, SAM MINKIM, YOUNG JINKIM, SEUNG EUIPYUN, JOON BUM
Owner KOREA KUMHO PETROCHEMICAL CO LTD
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