Thermoplastic resin composition and article produced therefrom
A thermoplastic resin composition and a molded article produced therefrom. The thermoplastic resin composition includes about 100 parts by weight of a thermoplastic resin and about 0.5 to about 30 parts by weight of zinc oxide. The zinc oxide has a peak intensity ratio (B/A) of about 0.01 to less than about 0.1, 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. The thermoplastic resin composition can exhibit good properties in terms of deodorization, impact resistance, and the like.
1. A thermoplastic resin composition comprising:
about 100 parts by weight of a thermoplastic resin; and
about 0.5 parts by weight to about 30 parts by weight of zinc oxide, the zinc oxide having a peak intensity ratio (B/A) of about 0.01 to less than about 0.1, where A indicates intensity of the peak in the wavelength range of 370 nm to 390 nm and B indicates intensity of the peak in the wavelength range of 450 nm to 600 nm in photoluminescence measurement,
wherein the zinc oxide has a photocatalytic efficiency of about 90% to about 99%, as calculated by Equation 1:
Photocatalytic
efficiency
(
%
)
=
N
1
-
N
2
N
1
×
100
where N1 denotes a UV absorbance of a 5 ppm methylene blue solution at a wavelength of 660 nm, and N2 denotes a UV absorbance of a 5 ppm methylene blue solution at a wavelength of 660 nm, as measured after 1,000 ppm of the zinc oxide is deposited in the methylene blue solution, followed by irradiation with UV-B in the wavelength range of 280 nm to 360 nm for 2 hours.
2. The thermoplastic resin composition according to claim 1 , wherein the zinc oxide has a peak position degree (2θ) in the range of about 35° to about 37° and a crystallite size of about 1,000 Å to about 2,000 Å in analysis of X-ray diffraction (XRD), as calculated by Equation 2:
Crystallite
size
(
D
)
=
K
λ
β
cos
θ
where K is a shape factor, λ is an X-ray wavelength, β is an FWHM value (degree) of an X-ray diffraction peak, and θ is a peak position degree.
3. The thermoplastic resin composition according to claim 1 , wherein the zinc oxide has a peak intensity ratio (B/A) of about 0.01 to less than about 0.07 in photoluminescence measurement.
4. The thermoplastic resin composition according to claim 1 , wherein the zinc oxide has an average particle diameter (D50) of about 0.5 μm to about 3 μm, as measured by a particle analyzer.
5. The thermoplastic resin composition according to claim 1 , wherein the zinc oxide has an average particle diameter (D50) of about 1 μm to about 3 μm, as measured by a particle analyzer.
6. The thermoplastic resin composition according to claim 1 , wherein the zinc oxide has a BET specific surface area of about 10 m 2 /g or less, as measured by a nitrogen gas adsorption method using a BET analyzer.
7. The thermoplastic resin composition according to claim 1 , wherein the zinc oxide has a BET specific surface area of about 1 m 2 /g to about 7 m 2 /g, as measured by a nitrogen gas adsorption method using a BET analyzer.
8. The thermoplastic resin composition according to claim 1 , wherein the zinc oxide is prepared by melting zinc particles in a reactor, heating the molten zinc to about 850° C. to about 1,000° C. to vaporize the molten zinc, injecting oxygen gas into the reactor, cooling the reactor to about 20° C. to about 30° C., heating the reactor to about 700° C. to about 800° C. for about 30 to 150 minutes while injecting nitrogen/hydrogen gas into the reactor, and cooling the reactor to about 20° C. to about 30° C.
9. The thermoplastic resin composition according to claim 1 , wherein the thermoplastic resin comprises at least one of a rubber-modified vinyl-based copolymer resin, an aromatic vinyl resin, a polyolefin resin, a polycarbonate resin, a poly(alkyl (meth)acrylate) resin, a polyester resin, and a polyamide resin.
10. The thermoplastic resin composition according to claim 9 , wherein the rubber-modified vinyl-based copolymer resin comprises a rubber-modified vinyl graft copolymer and an aromatic vinyl copolymer resin.
11. The thermoplastic resin composition according to claim 10 , wherein the rubber-modified vinyl graft copolymer is prepared by graft polymerization of an aromatic vinyl monomer and a monomer copolymerizable with the aromatic vinyl monomer to a rubber polymer.
12. The thermoplastic resin composition according to claim 10 , wherein the aromatic vinyl copolymer resin is a copolymer of an aromatic vinyl monomer and a monomer copolymerizable with the aromatic vinyl monomer.
13. The thermoplastic resin composition according to claim 1 , wherein the thermoplastic resin is a rubber-modified vinyl-based copolymer resin, a polyolefin resin, and/or an aromatic vinyl resin.
14. The thermoplastic resin composition according to claim 1 , wherein the thermoplastic resin composition has a total carbon emission (E G ) of about 20 μgC/g to about 40 μgC/g, as measured on a 2 g specimen in accordance with PV 3341 (Determination of emission of organic compounds).
15. The thermoplastic resin composition according to claim 1 , wherein the thermoplastic resin composition has an Izod impact strength of about 4 kgf·cm/cm to about 30 kgf·cm/cm, as measured on an injection-molded ⅛″ thick specimen in accordance with ASTM D256.
16. The thermoplastic resin composition according to claim 1 , wherein the thermoplastic resin is a rubber-modified vinyl-based copolymer resin, and the thermoplastic resin composition has an Izod impact strength of about 15 kgf·cm/cm to about 30 kgf·cm/cm, as measured on an injection-molded ⅛″ thick specimen in accordance with ASTM D256.
17. The thermoplastic resin composition according to claim 1 , wherein the thermoplastic resin is a polyolefin resin and the thermoplastic resin composition has an Izod impact strength of about 4 kgf·cm/cm to about 10 kgf·cm/cm, as measured on an injection-molded ⅛″ thick specimen in accordance with ASTM D256.
18. The thermoplastic resin composition according to claim 1 , wherein the thermoplastic resin is an aromatic vinyl resin and the thermoplastic resin composition has an Izod impact strength of about 7 kgf·cm/cm to about 15 kgf·cm/cm, as measured on an injection-molded ⅛″ thick specimen in accordance with ASTM D256.
19. A molded article formed of the thermoplastic resin composition according to claim 1 .