Thermoplastic resin composition and molded article manufactured therefrom
A thermoplastic resin composition of the present invention is characterized by comprising: about 100 parts by weight of a thermoplastic resin containing a rubber-modified vinyl-based graft copolymer and an aromatic vinyl-based copolymer resin; about 10 to about 30 parts by weight of an antistatic agent; and about 0.01 to about 2 parts by weight of zinc oxide, wherein the antistatic agent comprises at least one of a polyether ester amide block copolymer, a polyalkylene glycol, and a polyamide. The thermoplastic resin composition is excellent in antibacterial properties, antistatic properties, impact resistance, and the like.
1. A thermoplastic resin composition comprising:
about 100 parts by weight of a thermoplastic resin comprising a rubber-modified vinyl graft copolymer and an aromatic vinyl copolymer resin;
about 10 to about 30 parts by weight of an antistatic agent; and
about 0.01 to about 2 parts by weight of zinc oxide,
wherein the antistatic agent comprises a polyetheresteramide block copolymer, a polyalkylene glycol, and/or a polyamide, and
wherein the zinc oxide has a peak position (2θ) in the range of 35° to 37° and a crystallite size of about 1,000 Å to about 2,000 Å, in X-ray diffraction (XRD) analysis, as calculated by Equation 1:
Crystallite
size
(
D
)
=
K
λ
β
cos
θ
[
Equation
1
]
where K is a shape factor, λ is an X-ray wavelength, β is a full width at half maximum (FWHM) value (degree) of an X-ray diffraction peak, and θ is a peak position degree.
2. The thermoplastic resin composition according to claim 1 , wherein the rubber-modified vinyl graft copolymer is prepared by graft polymerization of a monomer mixture comprising an aromatic vinyl monomer and a vinyl cyanide monomer to a rubber polymer.
3. The thermoplastic resin composition according to claim 1 , wherein the aromatic vinyl copolymer resin is a polymer of an aromatic vinyl monomer and a monomer copolymerizable with the aromatic vinyl monomer.
4. The thermoplastic resin composition according to claim 1 , wherein the rubber-modified vinyl graft copolymer is present in an amount of about 20 wt % to about 50 wt % and the aromatic vinyl copolymer resin is present in an amount of about 50 wt % to about 80 wt %, based on 100 wt % of the thermoplastic resin.
5. The thermoplastic resin composition according to claim 1 , wherein the zinc oxide has an average particle diameter of about 0.2 μm to about 3 μm and a BET specific surface area of about 1 m 2 /g to about 10 m 2 /g.
6. The thermoplastic resin composition according to claim 1 , wherein the zinc oxide has a peak intensity ratio (B/A) of about 0 to about 1, where A indicates a peak in the wavelength range of 370 nm to 390 nm and B indicates a peak in the wavelength range of 450 nm to 600 nm in photoluminescence measurement.
7. The thermoplastic resin composition according to claim 1 , wherein the thermoplastic resin composition has an antibacterial activity of about 2 to about 7 against Staphylococcus aureus and an antibacterial activity of about 2 to about 6.5 against Escherichia coli , as measured on 5 cm×5 cm specimens inoculated with Staphylococcus aureus and Escherichia coli , respectively, in accordance with JIS Z 2801.
8. The thermoplastic resin composition according to claim 1 , wherein the thermoplastic resin composition has a surface resistance of about 1×10 6 Ω·cm to about 1×10 10 Ω·cm, as measured in accordance with ASTM D257.
9. The thermoplastic resin composition according to claim 1 , wherein the thermoplastic resin composition has an Izod impact strength of about 15 kgf·cm/cm to about 25 kgf·cm/cm, as measured on a ⅛″ thick specimen in accordance with ASTM D256.
10. A molded article formed of the thermoplastic resin composition according to claim 1 .
11. A thermoplastic resin composition comprising:
about 100 parts by weight of a thermoplastic resin comprising a rubber-modified vinyl graft copolymer and an aromatic vinyl copolymer resin;
about 10 to about 30 parts by weight of an antistatic agent; and
about 0.01 to about 2 parts by weight of zinc oxide,
wherein the antistatic agent comprises a polyetheresteramide block copolymer, a polyalkylene glycol, and/or a polyamide,
wherein the zinc oxide has a peak intensity ratio (B/A) of about 0 to about 1, where A indicates a peak in the wavelength range of 370 nm to 390 nm and B indicates a peak in the wavelength range of 450 nm to 600 nm in photoluminescence measurement, a peak position (2θ) in the range of 35° to 37°, and a crystallite size of about 1,000 Å to about 2,000 Å, in X-ray diffraction (XRD) analysis, as calculated by Equation 1:
Crystallite
size
(
D
)
=
K
λ
β
cos
θ
[
Equation
1
]
where K is a shape factor, λ is an X-ray wavelength, β is a full width at half maximum (FWHM) value (degree) of an X-ray diffraction peak, and θ is a peak position degree, and
wherein the thermoplastic resin composition has an antibacterial activity of about 2 to about 7 against Staphylococcus aureus and an antibacterial activity of about 2 to about 6.5 against Escherichia coli , as measured on 5 cm×5 cm specimens inoculated with Staphylococcus aureus and Escherichia coli , respectively, in accordance with JIS Z 2801.
12. The thermoplastic resin composition according to claim 11 , wherein the thermoplastic resin composition has a surface resistance of about 1×10 6 Ω·cm to about 1×10 10 Ω·cm, as measured in accordance with ASTM D257.
13. The thermoplastic resin composition according to claim 12 , wherein the thermoplastic resin composition has an Izod impact strength of about 15 kgf·cm/cm to about 25 kgf·cm/cm, as measured on a ⅛″ thick specimen in accordance with ASTM D256.
14. A molded article formed of the thermoplastic resin composition according to claim 11 .