Lubricant composition and method of preparing copolymer using the same
View Patent ↗A lubricant composition includes a base oil, a phenothiazine-based polymerization inhibitor, and a polymerization inhibitory accelerator including a hindered phenol-based compound and a hydroquinone-based compound. A self-polymerization in a polymerizing process is suppressed by an interaction between the polymerization inhibitor and the polymerization inhibitory accelerator. A method of preparing a copolymer using the lubricant composition is also provided.
1. A lubricant composition for producing an ethylene-carboxylic acid copolymer, comprising:
a base oil;
a phenothiazine-based polymerization inhibitor including a compound represented by Chemical Formula 1:
wherein, in Chemical Formula 1, R 1 to R 8 are each independently hydrogen, a C1 to C5 alkyl group or a C1 to C5 alkoxy group; and
a polymerization inhibitory accelerator including a hindered phenol-based compound and a hydroquinone-based compound,
wherein the hindered phenol-based compound is represented by Chemical Formula 2 and the hydroquinone-based compound is represented by Chemical Formula 3:
wherein, in Chemical Formula 2, R 9 to R 11 are each a C1-C5 alkyl group,
wherein, in Chemical Formula 3, R 12 to R 16 are each hydrogen or a C1 to C5 alkyl group.
2. The lubricant composition according to claim 1 , wherein an amount of the polymerization inhibitor is from 1 ppm to 2,000 ppm relative to a weight of the base oil.
3. The lubricant composition according to claim 2 , wherein the amount of the polymerization inhibitor is from 1 ppm to 10 ppm relative to the weight of the base oil.
4. The lubricant composition according to claim 1 , wherein the hindered phenol-based compound is butylated hydroxytoluene (BHT).
5. The lubricant composition according to claim 1 , wherein the hydroquinone-based compound is hydroquinone monomethyl ether (MeHQ).
6. The lubricant composition according to claim 1 , wherein an amount of the polymerization inhibitory accelerator is from 1 wt % to 10 wt % based on a weight of the base oil.
7. The lubricant composition according to claim 1 , further comprising a polar non-aromatic compound.
8. The lubricant composition according to claim 7 , wherein the polar non-aromatic compound includes a fatty acid-based compound.
9. The lubricant composition according to claim 7 , wherein an amount of the polar non-aromatic compound exceeds 1 wt % and is less than or equal to 10 wt %.
10. A method of preparing an ethylene-carboxylic acid copolymer, comprising:
injecting the lubricant composition according to claim 1 into a discharge unit;
discharging a first monomer that includes a carboxylic acid-based monomer via the discharge unit; and
reacting the discharged first monomer with a second monomer.
11. The method according to claim 10 , wherein the second monomer is an ethylene-based polymerizable monomer.
12. The method according to claim 10 , wherein an injection rate of the lubricant composition into the discharge unit is in a range from 25 kg/hr to 130 kg/hr.
13. The method according to claim 10 , wherein a temperature in the discharge unit is in a range from 20° C. to 120° C., and a discharge pressure from the discharge unit is in a range from 1,100 bar to 2,500 bar.