Method for preparing modified and conjugated diene-based polymer and modified and conjugated diene-based polymer prepared using the same

1. A method for preparing a modified and conjugated diene-based polymer, the method comprising:

polymerizing conjugated diene-based monomers, or a conjugated diene-based monomer and an aromatic vinyl-based monomer in the presence of an organometal compound in a hydrocarbon solvent to prepare a conjugated diene-based polymer of which at least one terminal comprises an activated organometal part;

reacting the conjugated diene-based polymer with an alkoxysilane-based modifier to prepare a modified and conjugated diene-based polymer of which at least one terminal is combined with a functional group derived from the modifier;

adding an alcohol and an antioxidant to the modified and conjugated diene-based polymer to deactivate the activated organometal part remaining in the modified and conjugated diene-based polymer to prepare a modified and conjugated diene-based polymer which is deactivated; and

adding a modification stabilizer of the following Formula 1 to the modified and conjugated diene-based polymer which is deactivated, to perform a condensation reaction of the functional group derived from a modifier in the modified and conjugated diene-based polymer and the modification stabilizer of the following Formula 1:

in Formula 1,

m is an integer of 0 to 3,

R 1 is a functional group having a structure of the following Formula 1-1, and

R 2 and R 3 are each independently one of a halogen group, an alkyl group of 1 to 5 carbon atoms, or an alkoxy group of 1 to 5 carbon atoms, where at least one of R 2 and R 3 is the alkoxy group,

[R 11 —(R 12 ) n ]—  [Formula 1-1]

in Formula 1-1,

n is 0 or 1,

R 11 is an amino group or a four-member to six-member heterocyclic group containing 1 to 3 nitrogen atoms, which is unsubstituted or substituted with at least one substituent selected from the group consisting of an alkyl group of 1 to 10 carbon atoms and a cycloalkyl group of 3 to 10 carbon atoms, and

R 12 is an alkylene group of 1 to 10 carbon atoms, which is unsubstituted or substituted with an alkyl group of 1 to 10 carbon atoms.

2. The method for preparing a modified and conjugated diene-based polymer of claim 1 , wherein

R 1 is a functional group having a structure of Formula 1-1, where R 11 is selected from the group consisting of an amino group, an imidazolinyl group, a piperazinyl group, a methyl piperazinyl group, a pyrimidinyl group, a pyrrolidinyl group and a triazinyl group, which is unsubstituted or substituted with at least one substituent selected from the group consisting of an alkyl group of 1 to 6 carbon atoms and a cycloalkyl group of 3 to 6 carbon atoms, and R 12 is an alkylene group of 4 to 10 carbon atoms, which is unsubstituted or substituted with an alkyl group of 1 to 4 carbon atoms, and

R 2 and R 3 are each independently an alkoxy group of 1 to 5 carbon atoms.

3. The method for preparing a modified and conjugated diene-based polymer of claim 1 , wherein the modification stabilizer of Formula 1 is selected from the group consisting of compounds of the following Formulae 1a to 1c:

in Formulae 1a to 1c, Me is a methyl group.

4. The method for preparing a modified and conjugated diene-based polymer of claim 1 , wherein the modifier is a compound of the following Formula 2 or Formula 3:

in Formula 2 and formula 3,

A is selected from the group consisting of a C 1-20 alkyl group, a (C 1-20 alkyl)silyl group, a (C 1-20 alkoxy)silyl group, an amino group, a (C 1-20 alkyl)amino group, and a heterocyclic group containing at least one nitrogen atom, which is unsubstituted or substituted with at least one substituent selected from the group consisting of an alkyl group of 1 to 6 carbon atoms and a cycloalkyl group of 3 to 6 carbon atoms,

Y 1 to Y 3 are each independently a divalent hydrocarbon group of 1 to 20 carbon atoms,

Z 11 , Z 12 , and Z 21 to Z 23 are each independently a monovalent hydrocarbon group of 1 to 20 carbon atoms, which is unsubstituted or substituted with an organic group containing Si, O, or N, and which does not include active hydrogen, where at least one of Z 11 and Z 12 , and at least one of Z 21 to Z 23 are functional groups of the following Formula 4:

in Formula 4,

p is an integer of 0 to 2,

R a and R b are each independently a monovalent hydrocarbon group of 1 to 10 carbon atoms, and

W is a divalent hydrocarbon group of 1 to 10 carbon atoms, which is unsubstituted or substituted with an alkyl group of 1 to 4 carbon atoms.

5. The method for preparing a modified and conjugated diene-based polymer of claim 4 , wherein the heterocyclic group containing at least one nitrogen atom is selected from the group consisting of a piperazinyl group, a triazinyl group and an imidazolinyl group.

6. The method for preparing a modified and conjugated diene-based polymer of claim 1 , wherein the modifier is selected from the group consisting of the following Formula 5a to Formula 5h:

in Formulae 5a to 5h, Me is a methyl group and Et is an ethyl group.

7. The method for preparing a modified and conjugated diene-based polymer of claim 1 , wherein the alcohol and the antioxidant are each independently injected in an amount of 0.0001 parts by weight to 1 part by weight based on 100 parts by weight of a total amount of the monomers.

8. The method for preparing a modified and conjugated diene-based polymer of claim 1 , further comprising steam stripping of immersing a polymer obtained by the condensation reaction of the functional group derived from the modifier in the modified and conjugated diene-based polymer with the modification stabilizer of Formula 1 in water heated to 70° C. to 100° C. by steam, after the condensation reaction.