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.

1 . An asphalt modifier comprising a main chain of a vinyl aromatic hydrocarbon-conjugated diene block copolymer and a multifunctional group bound to the main chain, represented by the following Formula 1: 
       
         
           
           
               
               
           
         
         wherein A to C blocks are each independently a vinyl aromatic hydrocarbon block or a conjugated diene block, 
         X is a multifunctional group represented by the following Formula 2, 
         m, n, and o are each an integer greater than or equal to 0, provided that the sum of m, n, and o is greater than or equal to 2, and 
         p is an integer in a range of 0<p≤3; 
       
       
         
           
           
               
               
           
         
         wherein R 1  and R 2  are the same or different from each other, and each independently represent a C1 to C6 alkylene group, 
         * is a moiety of a multifunctional group that may be bound to a vinyl aromatic hydrocarbon block or conjugated diene block unit in the vinyl aromatic hydrocarbon-conjugated diene block copolymer, where one and two molecules of the vinyl aromatic hydrocarbon-conjugated diene block copolymer may be bound to one molecule of the multifunctional group. 
       
     
     
         2 . The asphalt modifier of  claim 1 , wherein the vinyl aromatic hydrocarbon block comprises at least one selected from the group consisting of styrene, α-methylstyrene, 3-methylstyrene, 4-methylstyrene, 4-propylstyrene, 4-cyclohexylstyrene, and 4-(para-methylphenyl) styrene. 
     
     
         3 . The asphalt modifier of  claim 1 , wherein the conjugated diene block comprises at least one selected from the group consisting of 1,3-butadiene, 2,3-dimethyl-1,3-butadiene, and 2-phenyl-1,3-butadiene. 
     
     
         4 . The asphalt modifier of  claim 1 , wherein X is included at an amount of 40 to 4,700 ppm, based on the total weight 1 of the block copolymer. 
     
     
         5 . The asphalt modifier of  claim 1 , wherein the asphalt modifier has a weight average molecular weight of from 15,000 to 500,000 g/mol. 
     
     
         6 . A method of preparing an asphalt modifier of  claim 1 , comprising:
 preparing a vinyl aromatic hydrocarbon block by polymerizing a vinyl aromatic hydrocarbon-based monomer in a hydrocarbon-based solvent using a polymerization initiator;   preparing a vinyl aromatic hydrocarbon-conjugated diene block copolymer by mixing a polymerization initiator and a conjugated diene monomer with the vinyl aromatic hydrocarbon block and polymerizing the resulting mixture; and   coupling a multifunctional group to the vinyl aromatic hydrocarbon-conjugated diene block copolymer by mixing a coupling agent with the vinyl aromatic hydrocarbon-conjugated diene block copolymer.   
     
     
         7 . The method of  claim 6 , wherein the coupling agent comprises at least one selected from the group consisting of ethylene glycol diglycidyl ether, 1,4-butanediol diglycidyl ether, 1,6-hexanediol diglycidyl ether, and neopentyl diglycidyl ether. 
     
     
         8 . An asphalt composition comprising asphalt, a cross-linking agent, and an asphalt modifier,
 wherein the asphalt modifier is the asphalt modifier of  claim 1 .