Residual monomer content controlling method of polymer
A method for controlling a residual monomer content of a polymer, wherein when a hot-air temperature and a hot-air velocity are maintained, the controlling method can predict the content of the residual monomer by controlling a hot-air mass ratio without influence of other external factors.
1. A method for controlling a residual monomer content in a polymer in a drying process using a dryer, comprising:
controlling the residual monomer content to a desired level based on a hot-air mass ratio factor represented by Equation 1 below:
A/B [Formula 1]
wherein, A is a mass (Kg) of hot-air flowing into the dryer, and B is a mass (Kg) of the polymer flowing into the dryer.
2. The residual monomer content controlling method of the polymer according to claim 1 ,
wherein the residual monomer content in the polymer is controlled without consideration of one or more external factors selected from the group consisting of bed sizes, superficial velocities, hot-air flow rates, retention times and polymer types.
3. The residual monomer content controlling method of the polymer according to claim 1 ,
wherein as the hot-air mass ratio represented by Equation 1 increases, the content of the residual monomer decreases linearly or non-linearly.
4. The residual monomer content controlling method of the polymer according to claim 1 , further comprising:
controlling the residual monomer content based on a hot-air temperature factor.
5. The residual monomer content controlling method of the polymer according to claim 4 ,
wherein the residual monomer content in the polymer is controlled to 4500 ppm or less by maintaining a hot-air temperature in a range of 60 to 100° C. and a hot-air mass ratio in a range of of 2 to 10.
6. The residual monomer content controlling method of the polymer according to claim 4 , further comprising:
controlling the residual monomer content based on a hot-air velocity factor.
7. The residual monomer content controlling method of the polymer according to claim 6 ,
wherein the residual monomer content in the polymer is controlled to 4000 ppm or less by maintaining a hot-air temperature at 70° C. and a hot-air velocity within a range of 0.2 to 0.6 m/s.
8. The residual monomer content controlling method of the polymer according to claim 1 ,
wherein the polymer is acrylonitrile butadiene styrene (ABS) copolymer particles.