Thermoplastic resin and molded article manufactured using the same

Abstract

The present invention provides a thermoplastic resin composition and a molded article comprising the thermoplastic resin composition. The thermoplastic resin composition comprises, in a predetermined content ratio: a matrix resin (A) comprising a polyalkylene terephthalate and a polycarbonate; an impact modifier (B) having a core-shell structure; a halogenated epoxy flame retardant (C); a compatibilizer (D); and a transesterification inhibitor (E). Among them, the melt flow index (250 °C, 5 kg) of the thermoplastic resin composition is 7.0 g / 10 min or more, and the WOM value measured according to UL 746C (f1 level) is 70% or more. The thermoplastic resin composition of the present invention has excellent mechanical strength, molding processability, flame retardancy, hot water resistance and weather resistance.

Description

Technical Field

[0001] [Cross - Reference to Related Applications]

[0002] This application claims the priority of Korean Patent Application No. 10 - 2021 - 0129431, filed with the Korean Intellectual Property Office on September 30, 2021, and Korean Patent Application No. 10 - 2022 - 0123139, filed again on September 28, 2022, based on the priority of the above - mentioned patent. The disclosures of these two patent applications are incorporated herein by reference, respectively.

[0003] The present invention relates to a thermoplastic resin composition and a molded article manufactured using the thermoplastic resin composition. More specifically, it relates to a thermoplastic resin composition having excellent mechanical strength, molding processability, flame retardancy, hot water resistance, and weather resistance, and a molded article manufactured using the thermoplastic resin composition. Background Art

[0004] Polycarbonate (PC) resin has excellent mechanical, physical, and optical properties and is used in various fields such as interior and exterior materials of automobiles and housings of electrical / electronic products. In particular, polycarbonate resin has excellent transparency and is applied to the manufacture of products that require high transparency.

[0005] However, due to the amorphous nature of polycarbonate resin, its chemical resistance is poor. Therefore, polycarbonate resin is mixed with crystalline materials and applied to components that require chemical resistance.

[0006] In particular, in addition to excellent chemical resistance, polybutylene terephthalate (PBT) resin has rigidity similar to that of polycarbonate resin. Therefore, polybutylene terephthalate (PBT) resin is widely used as a PC / PBT alloy resin.

[0007] However, in a high - temperature and high - humidity environment, polybutylene terephthalate resin is hydrolyzed, resulting in deterioration of physical properties. This phenomenon also occurs in alloy resins.

[0008] In addition, when polycarbonate resin and polybutylene terephthalate resin are mixed, an ester exchange reaction occurs, which causes deterioration of physical properties.

[0009] On the other hand, in order to prevent fires, electrical products are required to have a certain level or more of flame retardancy. However, when an impact modifier is added to improve mechanical strength, there is a problem that the flame retardancy of the composition decreases.

[0010] In addition, besides flame retardancy, outdoor electrical products such as electrical boxes need to have resistance to external impacts, as well as resistance to high temperatures, high humidity, rainwater, and ultraviolet rays according to various climate events, severe weather conditions, and long-term exposure to sunlight. Therefore, it is necessary to develop a material that can meet all these physical properties.

[0011] [Related Technical Literature]

[0012] [Patent Literature]

[0013] KR2003-0000778A Summary of the Invention

[0014] Technical Problem

[0015] Therefore, in view of the above problems, the present invention is proposed. An object of the present invention is to provide a thermoplastic resin composition having excellent mechanical strength, molding processability, flame retardancy, hot water resistance, and weather resistance.

[0016] Another object of the present invention is to provide a molded article manufactured using the thermoplastic resin composition.

[0017] The above object and other objects can be achieved by the present invention described below.

[0018] Technical Solution

[0019] According to one aspect of the present invention, there is provided a thermoplastic resin composition comprising: 100 parts by weight of a matrix resin (A) comprising 1% to 99% by weight of an alkylene terephthalate and 1% to 99% by weight of a polycarbonate; 5.5 to 9 parts by weight of an impact modifier (B) having a core-shell structure; 10 to 30 parts by weight of a halogenated epoxy flame retardant (C); 2 to 4.5 parts by weight of a compatibilizer (D); and 0.1 to 2 parts by weight of a transesterification inhibitor (E), wherein the melt flow index of the thermoplastic resin composition measured at a temperature of 250 °C and a load of 5 kg according to ASTM D1238 is 7.0 g / 10 min or more, and the WOM value measured according to UL 746C (f1 level) is 70% or more.

[0020] According to another aspect of the present invention, there is provided a thermoplastic resin composition comprising: 100 parts by weight of a matrix resin (A) comprising 1% to 99% by weight of a polyalkylene terephthalate having an intrinsic viscosity (I.V.) of 0.9 dl / g to 1.3 dl / g, and 1% to 99% by weight of a polycarbonate having a melt flow index of 1 g / 10 min to 11 g / 10 min measured at a temperature of 250 °C and a load of 5 kg according to ASTM D1238; 5.5 to 9 parts by weight of an impact modifier (B) having a core-shell structure; 10 to 30 parts by weight of a halogenated epoxy flame retardant (C); 2 to 4.5 parts by weight of a compatibilizer (D); and 0.1 to 2 parts by weight of a transesterification inhibitor (E).

[0021] According to still another aspect of the present invention, there is provided a thermoplastic resin composition comprising: 100 parts by weight of a matrix resin (A) comprising 1% to 99% by weight of a polyalkylene terephthalate having an intrinsic viscosity (I.V.) of 0.9 dl / g to 1.3 dl / g, and 1% to 99% by weight of a polycarbonate having a melt flow index of 1 g / 10 min to 11 g / 10 min measured at a temperature of 250 °C and a load of 5 kg according to ASTM D1238; 5.5 to 9 parts by weight of an impact modifier (B); 10 to 30 parts by weight of a halogenated cyclo-based flame retardant (C); 2 to 4.5 parts by weight of a glycidyl methacrylate compatibilizer (D) containing vinyl acrylate; and 0.1 to 2 parts by weight of a transesterification inhibitor (E) which is a dihydrogen phosphate.

[0022] The WOM value of the thermoplastic resin composition measured according to UL 746C (f1 level) can preferably be 70% or more.

[0023] The hot water resistance index value of the thermoplastic resin composition measured according to UL 746C (f1 level) can preferably be 50% or more.

[0024] The polyalkylene terephthalate can preferably be polybutylene terephthalate.

[0025] The intrinsic viscosity (I.V.) of polybutylene terephthalate can preferably be 0.9 dl / g to 1.3 dl / g.

[0026] According to ASTM D1238, the melt flow index of the polycarbonate measured at a temperature of 250 °C and a load of 5 kg can preferably be 1 g / 10 min to 11 g / 10 min.

[0027] Based on the total weight of the matrix resin, the matrix resin may preferably comprise 40 wt% to 60 wt% of an alkylene terephthalate and 40 wt% to 60 wt% of a polycarbonate.

[0028] The impact modifier may preferably be a butyl acrylate impact modifier.

[0029] The halogenated epoxy flame retardant may preferably be a brominated epoxy flame retardant.

[0030] The transesterification inhibitor may preferably be an inorganic phosphate compound, more preferably a dihydrogen phosphate, and still more preferably NaH2PO4.

[0031] Based on 100 parts by weight of the matrix resin, the thermoplastic resin composition may preferably comprise 2 to 8 parts by weight of a flame retardant aid. The flame retardant aid may preferably comprise antimony trioxide.

[0032] The compatibilizer may preferably include a glycidyl methacrylate compatibilizer. The glycidyl methacrylate compatibilizer may comprise vinyl acrylate. In this case, based on the total weight of the glycidyl methacrylate compatibilizer, the content of vinyl acrylate may preferably be 1 wt% to 20 wt%.

[0033] Based on 100 parts by weight of the matrix resin, the thermoplastic resin composition may preferably comprise 0.05 to 3 parts by weight of an ultraviolet stabilizer.

[0034] The ultraviolet stabilizer may preferably be a benzotriazole ultraviolet stabilizer.

[0035] The thermoplastic resin composition may preferably meet the f1 level specified in UL 746C.

[0036] According to another aspect of the present invention, there is provided a molded article comprising the thermoplastic resin composition.

[0037] The molded article may preferably be an electrical box.

[0038] Beneficial effects

[0039] According to the present invention, the present invention has the effect of providing a thermoplastic resin composition and a molded article manufactured using the thermoplastic resin composition. The thermoplastic resin composition has excellent hot water resistance and weather resistance, while maintaining mechanical strength, molding processability, and flame retardancy above a certain level, and can therefore be applied to the manufacture of outdoor electrical products for long-term use. Description of the drawings

[0040] Figure 1 and Figure 2An exemplary image of an outdoor electrical box is shown. Detailed Description of the Invention

[0041] Hereinafter, the thermoplastic resin composition of the present invention and a molded article containing the thermoplastic resin composition will be described in detail.

[0042] The inventors of the present invention have developed a flame-retardant PC / PBT alloy resin for outdoor use. In this study, the inventors confirmed that when a predetermined impact modifier, flame retardant, and compatibilizer are included in a predetermined content ratio, the molding processability and flame retardancy, which have a trade-off relationship with impact resistance, are improved to a certain level or higher, and the weather resistance and durability in a high-temperature and high-humidity environment are greatly improved. Based on these results, the inventors have conducted further research to complete the present invention.

[0043] The thermoplastic resin composition of the present invention comprises: 100 parts by weight of a matrix resin (A) containing 1% to 99% by weight of an alkylene terephthalate and 1% to 99% by weight of a polycarbonate; 5.5 to 9 parts by weight of an impact modifier (B) having a core-shell structure; 10 to 30 parts by weight of a halogenated epoxy-based flame retardant (C); 2 to 4.5 parts by weight of a compatibilizer (D); and 0.1 to 2 parts by weight of a transesterification inhibitor (E). In this case, according to ASTM D1238, the melt flow index of the thermoplastic resin composition measured at a temperature of 250 °C and a load of 5 kg is 7.0 g / 10 min or more, and the WOM value measured according to UL 746C (f1 level) is 70% or more. In this case, mechanical strengths such as tensile strength, flexural modulus, flexural strength, and impact strength, molding processability, and flame retardancy can be ensured at a certain level or higher, and both hot water resistance and weather resistance can be excellent.

[0044] In addition, the thermoplastic resin composition of the present invention comprises: 100 parts by weight of a matrix resin (A) comprising 1% to 99% by weight of an alkylene terephthalate and 1% to 99% by weight of a polycarbonate; 5.5 to 9 parts by weight of an impact modifier (B) having a core-shell structure; 10 to 30 parts by weight of a halogenated epoxy flame retardant (C); 2 to 4.5 parts by weight of a compatibilizer (D); and 0.1 to 2 parts by weight of a transesterification inhibitor (E). In this case, according to ASTM D1238, the melt flow index of the thermoplastic resin composition measured at a temperature of 250°C and a load of 5 kg is 7.0 g / 10 min or more, and the hot water resistance index value measured according to UL 746C (f1 level) is 50% or more. In this case, mechanical strengths such as tensile strength, flexural modulus, flexural strength and impact strength, molding processability, and flame retardancy can be ensured at a certain level or more, and both hot water resistance and weather resistance can be excellent.

[0045] In addition, the thermoplastic resin composition of the present invention comprises: 100 parts by weight of a matrix resin (A) comprising 1% to 99% by weight of an alkylene terephthalate having an intrinsic viscosity (I.V.) of 0.9 dl / g to 1.3 dl / g, and 1% to 99% by weight of a polycarbonate having a melt flow index measured at a temperature of 250°C and a load of 5 kg according to ASTM D1238 of 1 g / 10 min to 11 g / 10 min; 5.5 to 9 parts by weight of an impact modifier (B); 10 to 30 parts by weight of a halogenated epoxy flame retardant (C); 2 to 4.5 parts by weight of a compatibilizer (D); and 0.1 to 2 parts by weight of a transesterification inhibitor (E). In this case, mechanical strengths such as tensile strength, flexural modulus, flexural strength and impact strength, molding processability, and flame retardancy can be ensured at a certain level or more, and both hot water resistance and weather resistance can be excellent.

[0046] In addition, the thermoplastic resin composition of the present invention contains: 100 parts by weight of a matrix resin (A) comprising 1 wt% to 99 wt% of a polyalkylene terephthalate having an intrinsic viscosity (I.V.) of 0.9 dl / g to 1.3 dl / g, and 1 wt% to 99 wt% of a polycarbonate having a melt flow index measured according to ASTM D1238 at a temperature of 250 °C and a load of 5 kg of 1 g / 10 min to 11 g / 10 min; 5.5 parts by weight to 9 parts by weight of an impact modifier (B) having a core-shell structure; 10 parts by weight to 30 parts by weight of a halogenated epoxy flame retardant (C); 2 parts by weight to 4.5 parts by weight of a glycidyl methacrylate solvent (D) containing vinyl propionate; and 0.1 part by weight to 2 parts by weight of a transesterification inhibitor (E) which is a dihydrogen phosphate. In this case, mechanical strengths such as tensile strength, flexural modulus, flexural strength and impact strength, molding processability and flame retardancy can be ensured to be above a certain level, and both hot water resistance and weather resistance can be excellent.

[0047] In the present disclosure, the melt flow index can be measured according to ASTM D1238 at a temperature of 250 °C under a load of 5 kg for a reference time of 10 minutes. As a specific example, a melt indexer (GOETTFERT Co.) is used to heat a specimen to 250 °C, the specimen is placed in the cylinder of the melt indexer, and a load of 5 kg is applied with a piston. At this time, the weight (g) of the resin that melts and flows out in 10 minutes is measured, and the melt flow index is calculated based on the measured value.

[0048] In the present disclosure, the WOM value can be measured according to UL 746C (f1 level). As a specific example, according to the provisions of UL746C (f1 level), an accelerated aging tester conforming to ASTM G151 (aging tester, Atlas Co., Ci4000, xenon arc lamp, quartz (inside) / S. Boro (outside) filter, irradiation at 340 nm is 0.35 W / m 2 , the black panel temperature is 60 ± 3 °C) is used, and a process of exposing an impact specimen with a thickness of 3.2 mm to ultraviolet rays for 102 minutes and exposing the impact specimen to ultraviolet rays and water spray for 18 minutes is set as one cycle, and an accelerated aging test is carried out for 1,000 hours. At this time, the WOM value can be expressed as the retention rate (%) of the impact strength (according to ASTM D256) measured before and after the accelerated aging test.

[0049] In the present disclosure, the hot water resistance index value can be measured in accordance with UL 746C (f1 level). As a specific example, according to the provisions of UL 746C (f1 level), a notched specimen with a thickness of 3.2 mm is completely immersed in deionized water at 70 °C for 7 days. After taking out the specimen, it is then immersed in deionized water at 23 °C for 30 minutes to conduct the hot water resistance test. At this time, the hot water resistance index value can be expressed as the retention rate (%) of the impact strength (according to ASTM D256) measured before and after the hot water resistance test.

[0050] In the present disclosure, the impact strength can be measured as follows. Injection is carried out under the conditions that the injection temperature (based on the inlet) is 250 °C, the mold temperature is 60 °C, the holding pressure is 60 MPa, and the injection speed is 40 MPa to obtain a notched specimen with a thickness of 3.2 mm and a notch width of 2.54 mm. Then, the impact strength of the notched specimen can be measured at 23 °C using an impact tester (Toyoseiki Co.) in accordance with ASTM D256.

[0051] Hereinafter, each component of the thermoplastic resin composition of the present invention will be described in detail.

[0052] (A) Matrix resin

[0053] Based on 100 parts by weight of the matrix resin, the matrix resin contains 1 to 99% by weight of an alkylene terephthalate and 1 to 99% by weight of a polycarbonate. As a preferred example, the matrix resin may contain 40 to 60% by weight of an alkylene terephthalate and 40 to 60% by weight of a polycarbonate, more preferably 40 to 55% by weight of an alkylene terephthalate and 45 to 60% by weight of a polycarbonate, and still more preferably 45 to 55% by weight of an alkylene terephthalate and 45 to 55% by weight of a polycarbonate. Within this range, the mechanical strength, molding processability, hot water resistance, and weather resistance can all be excellent.

[0054] As a preferred example, the alkylene terephthalate may be polybutylene terephthalate (PBT). In this case, the molding processability, hot water resistance, and weather resistance can be excellent.

[0055] The commonly used polybutylene terephthalate resin in the art can be used as the polybutylene terephthalate without particular limitation. For example, the polybutylene terephthalate may be a polymer obtained by polycondensation through direct esterification or transesterification of 1,4-butanediol and terephthalic acid or dimethyl terephthalate.

[0056] For example, as the polybutylene terephthalate, a copolymer obtained by copolymerizing a polybutylene terephthalate resin and a compound for improving impact strength such as polytetramethylene glycol, polyethylene glycol, polypropylene glycol, aliphatic polyester, and aliphatic polyamide, or a modified polybutylene terephthalate obtained by mixing polybutylene terephthalate and a compound for improving impact strength can be used. In this case, the hot water resistance and weather resistance can be further improved without deteriorating other physical properties.

[0057] As another example, the alkylene terephthalate may include one or more selected from polyethylene terephthalate (PET) and polytrimethylene terephthalate (PTT), or a mixture of polybutylene terephthalate and one or more compounds. In this case, the molding processability can be further improved.

[0058] For example, the intrinsic viscosity (I.V.) of the alkylene terephthalate may be 0.9 dl / g to 1.3 dl / g, preferably 0.9 dl / g to 1.25 dl / g, and more preferably 0.95 dl / g to 1.25 dl / g. Within this range, the composition may have excellent molding processability, tensile strength, and flexural modulus.

[0059] For example, the intrinsic viscosity (I.V.) of the alkylene terephthalate may be 1.1 dl / g to 1.5 dl / g, preferably 1.1 dl / g to 1.4 dl / g, and more preferably 1.2 dl / g to 1.4 dl / g. Within this range, the composition may have excellent impact strength, tensile strength, flexural modulus, and molding processability.

[0060] In the present disclosure, when measuring the intrinsic viscosity, unless otherwise specified, a sample solution with a concentration of 0.05 g / ml is prepared by completely dissolving the sample in dichloromethane as a solvent, and then filtered using a filter to obtain a filtrate. Then, using the obtained filtrate, the intrinsic viscosity is measured at 20 °C using an Ubbelohde viscometer.

[0061] For example, the weight average molecular weight of the alkylene terephthalate may be 30,000 g / mol to 100,000 g / mol, 40,000 g / mol to 80,000 g / mol, or 45,000 g / mol to 70,000 g / mol. Within this range, the mechanical properties may be excellent.

[0062] In the present disclosure, unless otherwise specified, the weight-average molecular weight of the polyalkylene terephthalate can be measured by gel permeation chromatography (GPC, Waters Breeze). As a specific example, a solution of hexafluoroisopropanol (HFIP) containing 0.01 N sodium trifluoroacetate (NaTFA) can be used as the eluent, and the weight-average molecular weight can be measured by GPC. In this case, the obtained weight-average molecular weight is a relative value with respect to a polymethyl methacrylate (PMMA) standard sample. More specific measurement examples are as follows.

[0063] (1) Measuring instrument: EcoSEC HLC-8320GPC, Tosoh Co.

[0064] (2) Detector: RI detector:

[0065] (3) Solvent: HFIP + NaTFA (0.01 N)

[0066] (4) Column model: 2 × TSKgel SuperAWM-H (6.0 × 150 mm, Tosoh Co.)

[0067] (5) Column temperature: 40 °C

[0068] (6) Flow rate: 0.3 mL / min

[0069] (7) Sample concentration: 3 mg / mL

[0070] (8) Injection volume: 100 μl

[0071] (9) Data processing: EcoSEC software

[0072] (10) Standard sample: PMMA

[0073] The polyalkylene terephthalate can be prepared by using a method commonly used in the art for preparing polyalkylene terephthalate without particular limitation. Commercially available products can also be used as long as the products meet the definition of the present invention.

[0074] According to ISO 1133, the melt flow index of the polycarbonate measured at a temperature of 300 °C and a load of 1.2 kg can be 1 g / 10 min to 11 g / 10 min, preferably 3 g / 10 min to 10 g / 10 min or 1 g / 10 min to 8 g / 10 min, and more preferably 2 g / 10 min to 5 g / 10 min. Within this range, the mechanical strength and molding processability can be excellent.

[0075] For example, the weight-average molecular weight of the polycarbonate may be from 2,000 g / mol to 40,000 g / mol, preferably from 30,000 g / mol to 40,000 g / mol, and more preferably from 32,000 g / mol to 38,000 g / mol. Within this range, the balance between mechanical strength and physical properties can be excellent.

[0076] In the present disclosure, unless otherwise stated, tetrahydrofuran (THF) can be used as the eluent, and the weight-average molecular weight of the polycarbonate can be measured by a gel permeation chromatograph (GPC, Waters Breeze). In this case, the weight-average molecular weight can be obtained as a relative value with respect to a polystyrene (PS) standard sample. The specific measurement conditions are as follows: solvent: THF, column temperature: 40 °C, flow rate: 0.3 ml / min, sample concentration: 20 mg / ml, injection volume: 5 μl, column model: 1×PLgel 10 μm MiniMix-B (250×4.6 mm) + 1×PLgel 10 μm MiniMix-B (250×4.6 mm) + 1×PLgel 10 μm MiniMix-B Guard (50×4.6 mm), equipment name: Agilent 1200 series system, refractive index detector: Agilent G1362 RID, RI temperature: 35 °C, data processing: Agilent ChemStation S / W, test method (Mn, Mw and PDI): OECD TG 118.

[0077] For example, the intrinsic viscosity of the polycarbonate may be from 2.0 dl / g to 3.5 dl / g, preferably from 2.2 dl / g to 3.3 dl / g, and more preferably from 2.5 dl / g to 3.0 dl / g. Within this range, the balance between mechanical strength and physical properties can be excellent.

[0078] For example, according to ASTM D256, the impact strength of the polycarbonate measured using a specimen with a thickness of 1 / 8" at a temperature of 23 °C may be 50 kg·cm / cm or more, preferably from 50 kg·cm / cm to 80 kg·cm / cm, and more preferably from 65 kg·cm / cm to 75 kg·cm / cm. Within this range, the mechanical properties can be excellent while other physical properties do not deteriorate.

[0079] There is no particular limitation on the type of polycarbonate. For example, the polycarbonate may be a resin prepared by polymerizing a bisphenol monomer and a carbonate precursor.

[0080] For example, the bisphenol monomer may include one or more selected from bis(4-hydroxyphenyl)methane, bis(4-hydroxyphenyl)ether, bis(4-hydroxyphenyl)sulfone, bis(4-hydroxyphenyl)sulfoxide, bis(4-hydroxyphenyl)sulfide, bis(4-hydroxyphenyl)ketone, 1,1-bis(4-hydroxyphenyl)ethane, 2,2-bis(4-hydroxyphenyl)propane (bisphenol A; BPA), 2,2-bis(4-hydroxyphenyl)butane, 1,1-bis(4-hydroxyphenyl)cyclohexane (bisphenol Z; BPZ), 2,2-bis(4-hydroxy-3,5-dibromophenyl)propane, 2,2-bis(4-hydroxy-3,5-dichlorophenyl)propane, 2,2-bis(4-hydroxy-3-bromophenyl)propane, 2,2-bis(4-hydroxy-3-methylphenyl)propane, 2,2-bis(4-hydroxy-3,5-dimethylphenyl)propane, 1,1-bis(4-hydroxyphenyl)-1-phenylethane, bis(4-hydroxyphenyl)diphenylmethane, and α,ω-bis[3-(o-hydroxyphenyl)propyl]polydimethylsiloxane.

[0081] For example, the carbonate precursor may include one or more selected from dimethyl carbonate, diethyl carbonate, dibutyl carbonate, dicyclohexyl carbonate, diphenyl carbonate, dimethylxylene carbonate, bis(chlorophenyl) carbonate, m-tolyl carbonate, dinaphthyl carbonate, bis(diphenyl) carbonate, phosgene, triphosgene, dichlorophosgene, carbonyl bromide, and dihaloformate.

[0082] For example, the polycarbonate may include one or more selected from linear polycarbonate resin, branched polycarbonate resin, and polyester-carbonate copolymer resin, preferably a linear polycarbonate resin. In this case, due to the improved fluidity, the molding processability and appearance can be excellent.

[0083] As a preferred example, the linear polycarbonate resin may be a bisphenol A-based polycarbonate resin.

[0084] The polycarbonate can be prepared by a method commonly used in the art for preparing polycarbonate without particular limitation. Commercially available products can be used as long as they meet the definition of the present invention.

[0085] (B) Impact modifier having a core-shell structure

[0086] The content of the impact modifier having a core-shell structure is 5.5 parts by weight to 9 parts by weight. As a preferred example, the content of the impact modifier may be 5.7 parts by weight to 9 parts by weight, more preferably 6 parts by weight to 8.8 parts by weight, and still more preferably 6 parts by weight to 7.5 parts by weight. Within this range, the mechanical strength, molding processability, hot water resistance, and weather resistance can all be excellent.

[0087] In the present disclosure, the core-shell structure may follow the definition of the core-shell structure known in the art to which the present invention pertains. For example, the core-shell structure may be defined as a structure obtained by graft-polymerizing monomers in the presence of rubber, or may be defined as a multi-layer structure having two or more layers confirmed by an analytical instrument such as a transmission electron microscope (TEM) or a scanning electron microscope (SEM).

[0088] For example, an impact modifier having a core-shell structure may be a butyl acrylate impact modifier containing a butyl acrylate rubber core. In this case, the mechanical strength may be excellent without deteriorating other physical properties.

[0089] For example, based on the total weight of the butyl acrylate impact modifier, the butyl acrylate impact modifier may contain 50 wt% to 80 wt%, preferably 55 wt% to 75 wt%, more preferably 60 wt% to 75 wt% of butyl acrylate rubber. In this case, the mechanical strength, hot water resistance, and weather resistance may be excellent.

[0090] For example, an impact modifier having a core-shell structure may contain a butyl acrylate impact modifier containing a butyl acrylate rubber core, but may not contain an ethylene-(butyl)acrylate copolymer. In this case, compared with the case of an impact modifier containing an ethylene-(butyl)acrylate copolymer, the mechanical strength such as tensile strength, flexural modulus, and flexural strength, hot water resistance, and weather resistance may be excellent.

[0091] For example, the DLS average particle size of the core contained in the impact modifier having a core-shell structure may be 80 nm to 200 nm, more preferably 90 nm to 150 nm, still more preferably 100 nm to 140 nm, still more preferably 120 nm to 140 nm. In this case, the mechanical strength, hot water resistance, and weather resistance may be excellent.

[0092] For example, the TEM average particle size of the core contained in the impact modifier having a core-shell structure may be 50 nm to 140 nm, more preferably 60 nm to 110 nm, still more preferably 70 nm to 100 nm, still more preferably 80 nm to 95 nm. In this case, the mechanical strength, hot water resistance, and weather resistance may be excellent.

[0093] In the present disclosure, the DLS average particle size can be measured by dynamic light scattering method. Specifically, a sample in the form of latex can be used and measured as an intensity value using a particle size analyzer (Nicomp CW380, PPSCo.) in Gaussian mode. As a specific example, 0.1 g of latex with a solid content of 35 wt% to 50 wt% is diluted with 100 g of deionized water to prepare a sample, and according to the measurement method using automatic dilution and flow cell, the DLS average particle size of the sample is measured at 23 °C using a particle size analyzer (Nicomp CW380, PPS Co.) in the measurement mode of dynamic light scattering / intensity 300 kHz / intensity-weight Gaussian analysis.

[0094] In the present disclosure, the TEM average particle size can be measured by transmission electron microscopy (TEM) analysis. Specifically, the TEM average particle size refers to the value obtained by numerically measuring the particle size on a high-magnification image of the TEM and averaging the measurement results. Specific measurement examples are as follows:

[0095] - Sample preparation: Thermoplastic resin or thermoplastic resin composition prepared using an extrusion kneader

[0096] - Sample pretreatment: Trimming (23 °C) → Hydrazine treatment (72 °C, 5 days) → Slicing (-120 °C) → OsO4 vapor staining for 2 hours

[0097] - Analyzer: TEM (JEM-1400, Jeol Co.)

[0098] - Analysis conditions: Acc.Volt: 120 kV, spot size: 1 (×10K, ×25K, ×50K)

[0099] - Size (average particle size) measurement: Measure the average value of the maximum particle sizes in the first 10% of the particle size distribution.

[0100] Here, the average value of the maximum particle sizes in the first 10% of the particle size distribution can refer to the arithmetic average of the first 10% of the maximum diameters of more than 100 particles randomly selected from the TEM image.

[0101] For example, the core contained in the impact modifier having a core-shell structure can be a rubber with a glass transition temperature of -50 °C to -20 °C. The glass transition temperature can preferably be -45 °C to -23 °C, and more preferably -40 °C to -25 °C. Within this range, the impact strength can be excellent while other physical properties do not deteriorate.

[0102] In the present disclosure, the glass transition temperature can be measured using a differential scanning calorimeter (Q100 DSC, TA Instruments Co.) at a heating rate of 10 °C / min according to ASTM D3418.

[0103] For example, an impact modifier having a core-shell structure may include a shell prepared by including one or more selected from aromatic vinyl compounds, vinyl cyanide compounds, and alkyl methacrylates, and preferably a shell prepared by including an aromatic vinyl compound and a vinyl cyanide compound. In this case, the mechanical strength may be excellent.

[0104] In the present disclosure, a polymer containing a specific compound refers to a polymer prepared by polymerizing the compound, and the units in the polymer are from the compound.

[0105] In the present disclosure, for example, aromatic vinyl compounds may include one or more selected from styrene, α-methylstyrene, m-methylstyrene, p-methylstyrene, and p-tert-butylstyrene, and preferably styrene.

[0106] In the present disclosure, for example, vinyl cyanide compounds may include one or more selected from acrylonitrile, methacrylonitrile, ethyl acrylonitrile, and isopropyl acrylonitrile, and preferably acrylonitrile.

[0107] In the present disclosure, for example, alkyl methacrylates may be alkyl methacrylates containing an alkyl group having 1 to 15 carbon atoms. As a specific example, alkyl methacrylates may include one or more selected from methyl methacrylate, ethyl methacrylate, butyl methacrylate, 2-ethylbutyl methacrylate, 2-ethylhexyl methacrylate, and lauryl methacrylate, and preferably alkyl methacrylates containing a linear alkyl group having 1 to 4 carbon atoms, and more preferably methyl methacrylate.

[0108] For example, an impact modifier having a core-shell structure may be prepared by emulsion polymerization. In this case, chemical resistance, weather resistance, fluidity, tensile strength, and impact strength may be excellent. The emulsion polymerization may be carried out using a commonly used emulsion graft polymerization method in the art without particular limitation.

[0109] As another example, as an impact modifier having a core-shell structure, a commercially available product may be used as long as the product meets the definition of the present invention.

[0110] (C) Halogenated epoxy flame retardant

[0111] The content of the halogenated epoxy flame retardant is 10 parts by weight to 30 parts by weight. As a preferred example, the content of the halogenated epoxy flame retardant may be 12 parts by weight to 27 parts by weight, and more preferably 13 parts by weight to 25 parts by weight. Within this range, mechanical strength, molding processability, hot water resistance, and weather resistance may be excellent.

[0112] For example, the halogenated epoxy flame retardant may be a brominated epoxy flame retardant. In this case, the composition may have excellent thermal stability and flame retardancy.

[0113] As a specific example, the brominated epoxy flame retardant may be a bromine-substituted epoxy oligomer. More specifically, the brominated epoxy flame retardant may be a copolymer comprising bisphenol A compound units having n bromine substituents and bisphenol A glycidyl ether compound units having m bromine substituents. Here, m and n may each independently be an integer from 1 to 6, preferably an integer from 2 to 5, and more preferably 4. In this case, the thermal stability and flame retardancy may be excellent.

[0114] For example, the weight-average molecular weight of the brominated epoxy flame retardant may be from 800 g / mol to 5,000 g / mol, preferably from 1,000 g / mol to 4,000 g / mol, and more preferably from 1,100 g / mol to 3,000 g / mol. Within this range, the flame retardancy can be improved without deterioration of other physical properties.

[0115] The weight-average molecular weight of the brominated epoxy flame retardant can be measured using methods for measuring the weight-average molecular weight commonly used in the art to which the present invention pertains.

[0116] The halogenated epoxy flame retardant can be prepared using methods for preparing halogenated epoxy flame retardants commonly used in the art without particular limitation. Additionally, commercially available products can be used as long as they meet the definition of the present invention.

[0117] For example, in addition to the halogenated epoxy flame retardant, the thermoplastic resin composition of the present invention may further comprise a flame retardant aid. For example, the content of the flame retardant aid may be from 2 parts by weight to 8 parts by weight, preferably from 2 parts by weight to 7 parts by weight, and more preferably from 3 parts by weight to 5 parts by weight. In this case, due to the interaction between the halogenated epoxy flame retardant and the flame retardant aid, the flame retardancy can be further improved.

[0118] For example, the flame retardant aid may be an antimony compound. The antimony compound may preferably include antimony trioxide and / or antimony pentoxide, preferably antimony trioxide. In this case, the flame retardancy can be excellent without deterioration of other physical properties.

[0119] (D) Compatibilizer

[0120] The content of the compatibilizer is 2 to 4.5 parts by weight. As a preferred example, the content of the compatibilizer can be 2 to 4.3 parts by weight, more preferably 2 to 4.1 parts by weight, and still more preferably 2.0 to 3.2 parts by weight. Within this range, the mechanical strength, molding processability, hot water resistance, and weather resistance can be excellent.

[0121] For example, the compatibilizer can act as an impact buffer through interaction with the matrix resin. In particular, by controlling the crystallization rate of the polyalkylene terephthalate as a crystalline resin, the compatibilizer can further improve the mechanical strength and molding processability. Through this effect, the compatibilizer can be used to prevent the deterioration of the appearance that usually occurs during the injection process.

[0122] From this perspective, the compatibilizer can contain, as a preferred example, glycidyl methacrylate-based compatibilizers. In this case, the mechanical strength, especially the impact strength, can be greatly improved, and the effect of enhancing flame retardancy can be enhanced.

[0123] For example, based on a total of 100% by weight of the glycidyl methacrylate-based compatibilizer, the content of the glycidyl methacrylate compound can be 20% by weight or less, preferably 3% to 20% by weight, more preferably 5% to 15% by weight, and still more preferably 8% to 12% by weight. In this case, the mechanical strength and flame retardancy can be greatly improved.

[0124] For example, the glycidyl methacrylate-based compatibilizer can contain vinyl acrylate. In this case, the mechanical strength, hot water resistance, and weather resistance can be excellent.

[0125] For example, based on the total weight of the glycidyl methacrylate-based compatibilizer, the content of vinyl acrylate can be 1% to 20% by weight, preferably 1% to 15% by weight, and more preferably 3% to 10% by weight. In this case, the mechanical strength, hot water resistance, and weather resistance can be excellent without deterioration of other physical properties.

[0126] As a preferred example, the glycidyl methacrylate-based compatibilizer can be a copolymer prepared by polymerizing glycidyl methacrylate, an olefinic compound, and vinyl acetate, and more preferably an ethylene-glycidyl methacrylate copolymer grafted with vinyl acetate. In this case, the mechanical strength, molding processability, flame retardancy, hot water resistance, and weather resistance can be excellent without deterioration of other physical properties.

[0127] For example, the glycidyl methacrylate-based compatibilizer can also contain maleic acid or maleic anhydride. In this case, the heat resistance and balance of physical properties can be excellent.

[0128] For example, according to ASTM D1238, the melt flow index of the compatibilizer measured at a temperature of 190°C and a load of 2.16 kg can be from 1 g / 10 min to 20 g / 10 min, preferably from 1 g / 10 min to 15 g / 10 min, and more preferably from 5 g / 10 min to 10 g / 10 min. Within this range, the mechanical strength and the molding processability can be excellent.

[0129] For example, the glass transition temperature of the compatibilizer can be from -50°C to 0°C, preferably from -40°C to -10°C, and more preferably from -35°C to -20°C. Within this range, the mechanical strength and the molding processability can be excellent.

[0130] The glycidyl methacrylate-based compatibilizer can be prepared by using methods commonly used in the art for preparing glycidyl methacrylate-based compatibilizers without particular limitation. Additionally, commercially available products can also be used as long as they meet the definition of the present invention.

[0131] (E) Transesterification inhibitor

[0132] The content of the transesterification inhibitor is from 0.1 part by weight to 2.0 parts by weight. As a preferred example, the content of the transesterification inhibitor can be from 0.1 part by weight to 1.4 parts by weight, and more preferably from 0.2 part by weight to 0.8 part by weight. Within this range, the mechanical strength, the molding processability, the hot water resistance, and the weather resistance can be excellent.

[0133] For example, the transesterification inhibitor can inhibit the transesterification reaction between the carbonate units of the polycarbonate and the ester units of the polyalkylene terephthalate contained in the matrix resin, thereby preventing the deterioration of physical properties caused by transesterification. Additionally, the transesterification inhibitor can prevent the decomposition of the matrix resin, thereby improving the heat resistance and the weather resistance.

[0134] For example, the transesterification inhibitor can be a phosphate compound, preferably an inorganic phosphate compound. In this case, the effects of preventing the decomposition of the matrix resin and improving the hot water resistance can be excellent. Additionally, by inhibiting the discoloration of the composition that may occur during kneading and molding, the desired color can be more easily exhibited, and the appearance can be excellent.

[0135] The inorganic phosphate compound may preferably be a dihydrogen phosphate, more preferably an alkali metal dihydrogen phosphate, and still more preferably NaH2PO4. In this case, the effect of preventing the decomposition of the matrix resin can be further improved. In particular, the hot water resistance can be greatly improved. In addition, by suppressing the discoloration of the composition that may occur during kneading and molding, the desired color can be more easily exhibited, and the appearance can be excellent.

[0136] For example, when the transesterification inhibitor contains an organophosphate compound, during the process of kneading and molding the composition, the composition reacts with the flame retardant aid to darken the color of the pellets. In this case, when a pigment or the like is added, it becomes difficult to exhibit the desired color due to the darkening of the color of the pellets. As a specific example, the organophosphate compound may refer to a phosphate ester compound having one or more organic substituents, such as an alkyl phosphate and an aryl phosphate.

[0137] For example, in addition to the alkali metal dihydrogen phosphate, the transesterification inhibitor may further contain one or more selected from carbodiimide, zinc hydrogen phosphate, hydroxybenzophenone, and methyl salicylate. In this case, the hot water resistance and mechanical strength can be excellent.

[0138] (F) UV stabilizer

[0139] Preferably, the thermoplastic resin composition further contains an ultraviolet stabilizer. As a specific example, the thermoplastic resin composition may contain 0.1 to 2.0 parts by weight, preferably 0.1 to 1.4 parts by weight, and still more preferably 0.2 to 0.8 parts by weight of the ultraviolet stabilizer. Within this range, the hot water resistance and weather resistance can be excellent without deteriorating other physical properties.

[0140] For example, the ultraviolet stabilizer may be one or more selected from benzotriazole ultraviolet stabilizers, triazine ultraviolet stabilizers, benzophenone ultraviolet stabilizers, quinolinone ultraviolet stabilizers, benzoate ultraviolet stabilizers, cyanoacrylate ultraviolet stabilizers, and benzoxazole ultraviolet stabilizers, preferably one or more selected from benzotriazole ultraviolet stabilizers and triazine ultraviolet stabilizers, and still more preferably benzotriazole ultraviolet stabilizers. In this case, the weather resistance can be excellent without deteriorating other physical properties.

[0141] For example, the benzotriazole ultraviolet stabilizer can be a hydroxybenzotriazole compound, preferably a 2-(2'-hydroxyphenyl)benzotriazole compound. As a specific example, the benzotriazole ultraviolet stabilizer can be selected from 2-(3',5'-bis(1-methyl-1-phenylethyl)-2'-hydroxyphenyl)benzotriazole, 2-(2'-hydroxy-5'-methylphenyl)benzotriazole (CAS No. 2440-22-4), 2-(3',5'-di-tert-butyl-2'-hydroxyphenyl)benzotriazole, 2-(5'-tert-butyl-2'-hydroxyphenyl)benzotriazole, 2-(2'-hydroxy-5'-(1,1,3,3-tetramethylbutyl)phenyl)benzotriazole (CAS No. 3147-75-9), 2-(3',5'-di-tert-butyl-2'-hydroxyphenyl)-5-chlorobenzotriazole, 2-(3'-tert-butyl-2'-hydroxy-5'-methylphenyl)-5-chlorobenzotriazole, 2-(3'-sec-butyl-5'-tert-butyl-2'-hydroxyphenyl)benzotriazole, 2-(2'-hydroxy-4'-octoxyphenyl)benzotriazole, 2-(3',5'-di-tert-amyl-2'-hydroxyphenyl)benzotriazole, 2-(3',5'-bis(α,α-dimethylbenzyl)-2'-hydroxyphenyl)benzotriazole, 2-(3'-tert-butyl-2'-hydroxy-5'-(2-octyloxy-carbonylethyl)phenyl)-5-chlorobenzotriazole, 2-(3'-tert-butyl-5'-[2-(2-ethylhexyloxy)carbonylethyl]-2'-hydroxyphenyl)-5-chlorobenzotriazole, 2-(3'-tert-butyl-2'-hydroxy-5'-(2-methoxycarbonylethyl)phenyl)-5-chlorobenzotriazole, 2-(3'-tert-butyl-2'-hydroxy-5'-(2-methoxycarbonylethyl)phenyl)benzotriazole, 2-(3'-tert-butyl-2'-hydroxy-5'-(2-octyloxycarbonylethyl)phenyl)benzotriazole, 2-(3'-tert-butyl-5'-[2-(2-ethylhexyloxy)carbonylethyl]-2'-hydroxyphenyl)benzotriazole, 2-(3'-dodecyl-2'-hydroxy-5'-methylphenyl)benzotriazole, 2-(3'-tert-butyl-2'-hydroxy-5'-(2-isooctyloxycarbonylethyl)phenylbenzotriazole, 2,2'-methylenebis[4-(1,1,3,3-tetramethylbutyl)-6-benzotriazol-2-ylphenol], 2-(2H-benzotriazol-2-yl)-4,6-bis(1-methyl-1-phenylethyl)phenol (CAS No.One or more of the transesterification products of 2-[3'-tert-butyl-5'-(2-methoxycarbonylethyl)-2'-hydroxyphenyl]-2H-benzotriazole with polyethylene glycol, more preferably one or more selected from 2-(2'-hydroxy-5'-methylphenyl)benzotriazole, 2-(2'-hydroxy-5'-(1,1,3,3-tetramethylbutyl)phenyl)benzotriazole, and 2-(2H-benzotriazol-2-yl)-4,6-bis(1-methyl-1-phenylethyl)phenol, and even more preferably 2-(2H-benzotriazol-2-yl)-4,6-bis(1-methyl-1-phenylethyl)phenol. In this case, the weather resistance can be excellent without deterioration of other physical properties.

[0142] The triazine-based ultraviolet stabilizer can preferably be a triaryl-1,3,5-triazine compound. As a specific example, the triazine-based ultraviolet stabilizer can be one or more selected from Tinuvin 360 or UV 360; Tinuvin1577 or UV 1577 (2-[4,6-bis(2,4-dimethylphenyl)-1,3,5-triazin-2-yl]-5-(octyloxy)phenol); Cyasorb 1164 or UV1164; Cyasorb 2908 or UV 2908; and Cyasorb UV-3346 or UV 3346, and more preferably Tinuvin 1577 or UV 1577. In this case, the weather resistance can be excellent without deterioration of other physical properties.

[0143] For example, the benzophenone-based ultraviolet stabilizer can be one or more selected from 2,4-dihydroxybenzophenone, 2-hydroxy-4-methoxybenzophenone, 2-hydroxy-4-octyloxybenzophenone, 2-hydroxy-4-benzyloxy-benzophenone, 2-hydroxy-4-methoxy-5-sulfonylbenzophenone, 2-hydroxy-4-methoxy-5-sulfonylbenzophenone trihydrate, 2-hydroxy-4-dodecyloxy-benzophenone, 2-hydroxy-4-octadecyloxy-benzophenone, 2,2'-dihydroxy-4-methoxybenzophenone, 2,2',4,4'-tetrahydroxybenzophenone, 2,2'-dihydroxy-4,4'-dimethoxybenzophenone, 2,2'-dihydroxy-4,4'-dimethoxy-5-sodium benzophenone sulfonate, bis(5-benzoyl-4-hydroxy-2-methoxyphenyl)methane, 2-hydroxy-4-n-dodecyloxybenzophenone, 2-hydroxy-4-methoxy-2'-carboxybenzophenone, and 4,4'-bis(diethylamino)benzophenone.

[0144] For example, the indole-based ultraviolet stabilizer can be 2-[(1-methyl-2-phenyl-1H-indol-3-yl)methylene]malononitrile.

[0145] For example, the quinolinone ultraviolet stabilizer can be 4-hydroxy-3-[(phenylimino)methyl]-2(1H)-quinolinone.

[0146] For example, the benzoate ultraviolet stabilizer can be one or more selected from 2,4-di-tert-butylphenyl-3',5'-di-tert-butyl-4'-hydroxybenzoate, 2,6-di-tert-butylphenyl-3',5'-di-tert-butyl-4'-hydroxybenzoate, n-hexadecyl-3,5-di-tert-butyl-4-hydroxybenzoate, and n-octadecyl-3,5-di-tert-butyl-4-hydroxybenzoate.

[0147] For example, the cyanoacrylate ultraviolet stabilizer can be 2'-ethylhexyl-2-cyano-3,3-diphenylacrylate, ethyl-2-cyano-3-(3',4'-methylenedioxyphenyl)-acrylate, or a mixture thereof.

[0148] For example, the molecular weight of the ultraviolet stabilizer can be from 350 g / mol to 600 g / mol, preferably from 400 g / mol to 550 g / mol, more preferably from 420 g / mol to 470 g / mol. Within this range, due to the high absorption in the wavelength range below 400 nm, preferably in the wavelength range of 280 nm to 360 nm, the weather resistance can be excellent.

[0149] The molecular weight of the ultraviolet stabilizer can be calculated based on the molecular formula. If necessary, the molecular weight of the ultraviolet stabilizer can be measured using the methods for measuring molecular weight commonly used in the field to which the present invention pertains.

[0150] Thermoplastic resin composition

[0151] According to ASTM D1238, the melt flow index of the thermoplastic resin composition of the present invention having the above composition measured at a temperature of 250 °C and a load of 5 kg can be 7.0 g / 10 min or more, indicating that the thermoplastic resin composition has excellent molding and processing properties. In addition, according to UL 746C (f1 level), the WOM value of the thermoplastic resin composition can be 70% or more, indicating that the thermoplastic resin composition has excellent weather resistance.

[0152] In addition, according to ASTM D1238, the melt flow index of the thermoplastic resin composition of the present invention having the above composition measured at a temperature of 250 °C and a load of 5 kg can be 7.0 g / 10 min or more, indicating that the thermoplastic resin composition has excellent molding and processing properties. In addition, according to UL 746C (f1 classification), the hot water resistance index value of the thermoplastic resin composition can be 50% or more, indicating that the thermoplastic resin composition has excellent hot water resistance.

[0153] In addition, the thermoplastic resin composition of the present invention may comprise: 100 parts by weight of a matrix resin (A) comprising 1% to 99% by weight of a polyalkylene terephthalate having an intrinsic viscosity (I.V.) of 0.9 dl / g to 1.3 dl / g, and 1% to 99% by weight of a polycarbonate having a melt flow index measured at a temperature of 250°C and a load of 5 kg according to ASTM D1238 of 1 g / 10 min to 11 g / 10 min; 5.5 to 9 parts by weight of an impact modifier (B) having a core-shell structure; 10 to 30 parts by weight of a halogenated epoxy flame retardant (C); 2 to 4.5 parts by weight of a compatibilizer (D); and 0.1 to 2 parts by weight of a transesterification inhibitor (E). In this case, mechanical strength, molding processability, and flame retardancy can be ensured above a certain level, and hot water resistance and weather resistance can be greatly improved. Therefore, the thermoplastic resin composition can be applied to the manufacture of outdoor electrical products for long-term use.

[0154] As a specific example, the thermoplastic resin composition of the present invention may comprise a brominated epoxy flame retardant as the halogenated epoxy flame retardant, and may further comprise an antimony compound, preferably antimony trioxide, as a flame retardant aid. The thermoplastic resin composition may comprise an inorganic phosphate compound, preferably an alkali metal dihydrogen phosphate, as the transesterification inhibitor, and may not comprise an organic phosphate ester compound, that is, the thermoplastic resin composition does not comprise an organic phosphate ester compound. In this case, discoloration can be inhibited without deterioration of other physical properties, and thus, the appearance can be excellent.

[0155] In the present disclosure, not comprising an organic phosphate ester compound means that an organic phosphate ester compound is not artificially comprised in the thermoplastic resin composition. Specifically, not comprising an organic phosphate ester compound means that the content of the organic phosphate ester compound in the thermoplastic resin composition is less than 0.1% by weight or 0% by weight.

[0156] As a specific example, the thermoplastic resin composition of the present invention may comprise a butyl acrylate impact modifier as the impact modifier having a core-shell structure, and may not comprise an ethylene-(butyl)acrylate copolymer, that is, the thermoplastic resin composition does not comprise an ethylene-(butyl)acrylate copolymer. In this case, mechanical strengths such as tensile strength, flexural modulus, and flexural strength, hot water resistance, and weather resistance can be excellent.

[0157] For example, the melt flow index (at 250 °C, 5 kg) of the thermoplastic resin composition may be from 7.0 g / 10 min to 20 g / 10 min, preferably from 7.0 g / 10 min to 17 g / 10 min, more preferably from 7.3 g / 10 min to 17 g / 10 min, and still more preferably from 8.2 g / 10 min to 14 g / 10 min. In this case, the molding processability and the appearance of the molded article may be excellent without deterioration of other physical properties.

[0158] The WOM value of the thermoplastic resin composition measured according to UL 746C (f1 level) may preferably be from 70% to 100%, more preferably from 75% to 95%, still more preferably from 80% to 93%, and even more preferably from 81.1% to 90%. As a preferred example, the WOM value of the thermoplastic resin composition may be from 78% to 99%, more preferably from 85% to 98%, and still more preferably from 90% to 98%. In this case, the mechanical strength, molding processability, flame retardancy, hot water resistance, and weather resistance may be excellent.

[0159] The hot water resistance index value of the thermoplastic resin composition measured according to UL 746 (f1 level) may preferably be from 50% to 100%, more preferably from 60% to 95%, and still more preferably from 70% to 90%. As a preferred example, the hot water resistance index value of the thermoplastic resin composition may be from 75% to 98%, more preferably from 78% to 95%, and still more preferably from 80% to 93%. In this case, the mechanical strength, molding processability, flame retardancy, hot water resistance, and weather resistance may be excellent.

[0160] As a preferred example, the flame retardancy (specimen thickness: 0.8 mm) of the thermoplastic resin composition measured according to the UL 94 standard may be V-1 or higher, more preferably V-0 or higher, and may have excellent flame retardancy.

[0161] In the present disclosure, as a specific example, the flame retardancy may be measured using a specimen having dimensions of 127 mm × 12.7 mm × 0.8 mm according to the UL 94 standard (vertical burning test).

[0162] As a preferred example, when a specimen for measuring flame retardancy with a thickness of 0.8 mm is prepared using the thermoplastic resin composition and an accelerated aging test is conducted on it in the same manner as the WOM value measurement method according to UL 746C (f1 level), when the flame retardancy test is performed on the specimen before and after the accelerated aging test according to the UL94 standard, the specimen can have the same flame retardancy rating. In this case, even when exposed to harsh weather conditions such as ultraviolet rays or rain, deterioration of the flame retardancy can be prevented, and an outdoor molded article with excellent flame retardancy can be provided.

[0163] As a preferred example, when a specimen for measuring flame retardancy with a thickness of 0.8 mm is prepared using the thermoplastic resin composition and a hot water resistance test is conducted on it in the same manner as the method for measuring the hot water resistance index value according to UL 746C (f1 level), and then the specimen is additionally conditioned for 2 weeks under the conditions of a temperature of 23°C and a relative humidity of 50%, when the flame retardancy test is performed on the specimen before and after the hot water resistance test and the additional conditioning according to the UL94 standard, the specimen can have the same flame retardancy rating. In this case, even when exposed to hot water, deterioration of the flame retardancy can be prevented, and an outdoor molded article with excellent retention of flame retardancy can be provided.

[0164] As a preferred example, the WOM value of the thermoplastic resin composition measured according to UL 746C (f1 level) can be 70% or more, and the hot water resistance index value can be 50% or more. Additionally, when the flame retardancy rating is measured before and after the accelerated aging test, and when the flame retardancy rating is measured before and after the hot water resistance test and the additional conditioning, the flame retardancy rating does not change. Therefore, the thermoplastic resin composition can meet the f1 level specified in UL 746C. Therefore, the thermoplastic resin composition can be applied to high-impact flame retardant materials for outdoor use.

[0165] As a preferred example, the tensile strength of the thermoplastic resin composition measured according to ASTM D638 using a specimen with a thickness of 3.2 mm at a temperature of 23°C and a test speed of 50 mm / min can be 500 MPa or more, preferably 520 MPa to 630 MPa, more preferably 525 MPa to 620 MPa, still more preferably 535 MPa to 600 MPa, and even more preferably 537 MPa to 590 MPa. Within this range, the mechanical strength can be excellent while other physical properties do not deteriorate.

[0166] In the present disclosure, as a specific example, the tensile strength can be measured according to ASTM D638 using a specimen with dimensions of 165 mm (length) × 19 mm (width) × 3.2 mm (thickness) at a temperature of 23 °C and a test speed of 50 mm / min.

[0167] As a preferred example, according to ASTM D790, the flexural modulus of the thermoplastic resin composition measured using a specimen with a thickness of 3.2 mm at a test speed of 2.8 mm / min and a span of 50 can be 20,000 kgf / cm 2 Above, preferably 20,000 kgf / cm 2 to 25,000 kgf / cm 2 and more preferably 21,000 kgf / cm 2 to 24,000 kgf / cm 2 and even more preferably 21,000 kgf / cm 2 to 23,000 kgf / cm 2 . Within this range, the mechanical strength can be excellent without deterioration of other physical properties.

[0168] As a preferred example, according to ASTM D790, the flexural strength of the thermoplastic resin composition measured using a specimen with a thickness of 3.2 mm at a test speed of 2.8 mm / min and a span of 50 can be 800 kgf / cm 2 Above, preferably 800 kgf / cm 2 to 1,000 kgf / cm 2 and more preferably 820 kgf / cm 2 to 1,000 kgf / cm 2 and even more preferably 825 kgf / cm 2 to 900 kgf / cm 2 . Within this range, the mechanical strength can be excellent without deterioration of other physical properties.

[0169] In the present disclosure, as a specific example, the flexural modulus and flexural strength can be measured according to ASTM D790 using a specimen with dimensions of 127 mm (length) × 12.7 mm (width) × 3.2 mm (thickness) at a room temperature of 23 °C, a test speed of 2.8 mm / min, and a span of 50 mm.

[0170] As a preferred example, the impact strength of the thermoplastic resin composition measured according to ASTM D256 may be 70 kgf·cm / cm or more, preferably 70 kgf·cm / cm to 100 kgf·cm / cm, more preferably 76 kgf·cm / cm to 100 kgf·cm / cm, and still more preferably 80 kgf·cm / cm to 95 kgf·cm / cm. Within this range, the mechanical strength can be excellent while other physical properties do not deteriorate.

[0171] The thermoplastic resin composition of the present invention has excellent mechanical strength, molding processability, and flame retardancy at room temperature as described above. Therefore, it can be applied to the manufacture of electrical products. Additionally, when measuring the impact strength retention rate and the flame retardancy grade retention rate before and after the weather resistance and hot water resistance tests, the thermoplastic resin composition meets the f1 level specified in UL746C. Therefore, the thermoplastic resin composition can be suitably used as an impact-resistant flame retardant material for outdoor use.

[0172] For example, according to ISO 1183, the specific gravity of the thermoplastic resin composition measured at a temperature of 23°C may be 1.25 to 1.40, preferably 1.30 to 1.33. Within this range, the thermoplastic resin composition can have good mechanical properties. Therefore, it can be applied to the manufacture of molded products such as electrical products, and as a specific example, an electrical box.

[0173] When necessary, based on 100 parts by weight of the matrix resin, the thermoplastic resin composition may further contain one or more other additives selected from lubricants, heat stabilizers, pigments, mold release agents, antistatic agents, antibacterial agents, processing aids, metal deactivators, flame retardants, anti-dripping agents, friction reducing agents, and anti-wear agents in an amount of 0.01 parts by weight to 10 parts by weight, 0.05 parts by weight to 7 parts by weight, 0.1 parts by weight to 5 parts by weight, or 0.5 parts by weight to 4.5 parts by weight. Within this range, the desired physical properties can be effectively achieved without reducing the inherent physical properties of the thermoplastic resin composition of the present invention.

[0174] For example, the lubricant may include one or more selected from fatty acid amide compounds, lignite waxes, and olefin waxes, preferably olefin waxes, and more preferably polyethylene wax. In this case, the molding processability and mold release property can be excellent, and the friction noise resistance can be further improved.

[0175] For example, the fatty acid amide compounds may include one or more selected from stearamide, behenamide, ethylene bis(stearamide), N,N'-ethylene bis(12-hydroxy stearamide), erucamide, oleamide, and ethylene bisoleamide.

[0176] For example, lignite waxes may be montan wax, montan ester wax, or a mixture thereof.

[0177] For example, olefin waxes may be polyethylene wax, polypropylene wax, or a mixture thereof.

[0178] For example, based on a total of 100 parts by weight of matrix resin (A), impact modifier (B) having a core - shell structure, halogenated epoxy flame retardant (C), compatibilizer (D), and transesterification inhibitor (E), the content of the lubricant may be from 0.05 parts by weight to 1.0 part by weight, preferably from 0.1 part by weight to 0.7 part by weight, and more preferably from 0.1 part by weight to 0.5 part by weight. Within this range, the balance of physical properties and the appearance of the molded article may be excellent.

[0179] As the wax of the present invention, a wax conforming to the shape and / or properties of waxes generally recognized in the field to which the present invention pertains may be used without particular limitation.

[0180] For example, the heat stabilizer may include phenolic heat stabilizers (antioxidants). In this case, thermal oxidation can be prevented during the extrusion process, and the mechanical properties and heat resistance may be excellent.

[0181] For example, phenolic heat stabilizers may include one or more selected from N,N'-hexane-1,6-diyl-bis[3-(3,5-di-tert-butyl-4-hydroxyphenyl)propanamide], pentaerythritol tetra[3-(3',5'-di-tert-butyl-4-hydroxyphenyl)propionate] (CAS No. 6683-19-8), N,N'-hexamethylene-bis(3,5-di-tert-butyl-4-hydroxyhydrocinnamide), triethylene glycol-bis[3-(3-tert-butyl-5-methyl-4-hydroxyphenyl)propionate], 1,3,5-trimethyl-2,4,6-tris(3,5-di-tert-butyl-4-hydroxybenzyl)benzene, 1,3,5-tris(4-tert-butyl-3-hydroxy-2,6-dimethylbenzyl)isocyanuric acid ester, and hindered phenolic heat stabilizers. In this case, heat resistance can be significantly improved while maintaining a high level of physical property balance. For example, hindered phenolic heat stabilizers may include one or more selected from octadecyl 3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate (CAS No. 2082-79-3), 2,2'-methylenebis(4-methyl-6-tert-butylphenol), hexamethylene glycol-bis(3,5-di-tert-butyl-4-hydroxyhydrocinnamate), triethylene glycol-bis-3-(3-tert-butyl-4-hydroxy-5-methylphenyl)propionate, 1,3,5-trimethyl-2,4,6-tris(3,5-di-tert-butyl-4-hydroxy-benzyl)benzene, n-octadecyl-3-(4'-hydroxy-3',5'-di-tert-butylphenyl)propionate, 4,4'-methylenebis(2,6-di-tert-butylphenol), 4,4'-butylidene-bis(6-tert-butyl-3-methyl-phenol), distearyl 3,5-di-tert-butyl-4-hydroxybenzylphosphonate, 2-tert-butyl-6-(3-tert-butyl-5-methyl-2-hydroxybenzyl)-4-methylphenyl acrylate, and 3,9-bis{2-[3-(3-tert-butyl-4-hydroxy-5-methylphenyl)propionyloxy]-1,1-dimethylethyl}-2,4,8,10-tetraoxaspiro[5,5]undecane. The heat stabilizer may preferably be pentaerythritol [3-(3',5'-di-tert-butyl-4-hydroxyphenyl)propionate], octadecyl 3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate, or a mixture thereof.

[0182] For example, based on a total of 100 parts by weight of matrix resin (A), impact modifier (B) having a core-shell structure, halogenated epoxy flame retardant (C), compatibilizer (D), and transesterification inhibitor (E), the content of the heat stabilizer may be 0.05 parts by weight to 1.0 part by weight, preferably 0.1 part by weight to 0.7 part by weight, more preferably 0.1 part by weight to 0.5 part by weight. Within this range, the physical property balance can be excellent, and heat resistance can be improved.

[0183] The pigment may be an inorganic pigment or an organic pigment.

[0184] For example, the organic pigment may include one or more selected from the group consisting of cyclohexanone pigments, anthraquinone pigments, perylene pigments, phthalocyanine pigments, azo pigments, indigo pigments, dioxazine pigments, quinacridone pigments, methane pigments, quinoline pigments, isoindolinone pigments, and phthalone pigments.

[0185] For example, the inorganic pigment may include one or more selected from the group consisting of ultramarine pigments, titanium dioxide, zinc sulfide, zinc oxide, iron oxide, and carbon black.

[0186] For example, as the release agent, one or more selected from the group consisting of glyceryl stearate and polyethylene tetrastearate may be used, but are not limited thereto.

[0187] For example, as the antistatic agent, one or more selected from the group consisting of anionic surfactants and nonionic surfactants may be used, but are not limited thereto.

[0188] For example, the anti-dripping agent may include one or more selected from the group consisting of polytetrafluoroethylene (PTFE), a mixture of PTFE and styrene-acrylonitrile (SAN) resin (PTFE / SAN), a mixture of PTFE and PMMA (PTFE / PMMA), polyamide, polysilicon, and a tetrafluoroethylene-hexafluoropropylene (TFE-HFP) copolymer, preferably one or more selected from PTFE / SAN and PTFE / PMMA. In the PTFE / SAN mixture and the PTFE / PMMA mixture, the weight ratio of PTFE to SAN resin and the weight ratio of PTFE to PMMA are 1:0.5 to 1.5, respectively. For example, the weight ratio of PTFE to SAN resin and the weight ratio of PTFE to PMMA may be 1:1, respectively.

[0189] In the present invention, antibacterial agents, processing aids, metal passivators, flame retardants, antifriction agents, and antiwear agents commonly used in the field to which the present invention pertains may be used without particular limitation.

[0190] Method for preparing a thermoplastic resin composition

[0191] The method for preparing the thermoplastic resin composition of the present invention may include the step of melt-kneading and extruding the following substances at 240°C to 280°C and 150 rpm to 300 rpm: 100 parts by weight of a matrix resin (A) comprising 1% to 99% by weight of a polyalkylene terephthalate and 1% to 99% by weight of a polycarbonate; 5.5 parts by weight to 9 parts by weight of an impact modifier (B) having a core-shell structure; 10 parts by weight to 30 parts by weight of a halogenated epoxy flame retardant (C); 2 parts by weight to 4.5 parts by weight of a compatibilizer (D); and 0.1 part by weight to 2 parts by weight of a transesterification inhibitor (E). In this case, mechanical strength, molding processability, and flame retardancy can be ensured, and hot water resistance and weather resistance can be greatly improved. Therefore, the thermoplastic resin composition can be applied to the manufacture of outdoor electrical products for long-term use.

[0192] The method for preparing the thermoplastic resin composition has all the technical characteristics of the above thermoplastic resin composition. Therefore, its repeated description will be omitted.

[0193] For example, the melt-kneading and extrusion step can be carried out at a temperature of 240°C to 280°C and a screw speed of the extruder of 150 rpm to 300 rpm, preferably at a temperature of 245°C to 270°C and a screw speed of the extruder of 170 rpm to 260 rpm, more preferably at a temperature of 250°C to 260°C and a screw speed of the extruder of 190 rpm to 220 rpm. Within this range, desired physical properties can be sufficiently obtained.

[0194] For example, one or more selected from a single-screw extruder, a twin-screw extruder, and a Banbury mixer can be used for the melt-kneading and extrusion step. Preferably, a twin-screw extruder can be used to carry out the melt-kneading and extrusion step by uniformly mixing and extruding the components to obtain the thermoplastic resin composition in the form of pellets. In this case, deterioration of physical properties and heat resistance can be prevented, and the appearance can be excellent.

[0195] Molded article

[0196] The molded article of the present invention contains the thermoplastic resin composition of the present invention. In this case, in addition to mechanical strength, molding processability, and flame retardancy, hot water resistance and weather resistance can both be excellent.

[0197] The molded article can be manufactured by using methods commonly used in the art for manufacturing molded articles. For example, by using the melt-kneaded material or pellets of the thermoplastic resin composition of the present invention as raw materials, molding methods such as injection molding, injection compression molding, extrusion molding, blow molding, die molding, pneumatic molding, thermoforming, compression molding, calendering molding, or rotational molding can be applied. The size, thickness, etc. of the molded article can be appropriately adjusted according to the intended use.

[0198] As a specific example, the molded article can be manufactured by injecting the melt-kneaded material or pellets of the thermoplastic resin composition of the present invention using an injection machine.

[0199] For example, the injection step can be carried out by injecting the melt-kneaded material or pellets at an injection temperature of 240°C to 280°C, a mold temperature of 40°C to 80°C, and an injection speed of 10 mm / sec to 50 mm / sec, preferably at an injection temperature of 245°C to 270°C, a mold temperature of 50°C to 70°C, and an injection speed of 20 mm / sec to 40 mm / sec.

[0200] The molded article can have excellent mechanical strength, molding processability, and flame retardancy, and can also have excellent hot water resistance and weather resistance. Therefore, the molded article can be applied to products that require high mechanical strength and flame retardancy, and is commonly used in high-temperature environments and outdoors. As a specific example, the molded article can be applied to outdoor electrical products, preferably electrical boxes.

[0201] The following Figure 1 and Figure 2 show exemplary images of electrical boxes having different shapes. Here, the image shows the electrical box door open. When the molded article of the present invention is applied to such an electrical box, the long-term durability can be excellent, and the physical properties do not deteriorate over a long time.

[0202] When describing the thermoplastic resin composition of the present invention, the method for preparing the thermoplastic resin composition, and the molded article containing the same, it should be noted that other conditions or equipment not specifically described herein can be appropriately selected within the scope of common practice in the art, without particular limitation.

[0203] Hereinafter, the present invention will be described in more detail with reference to the following preferred embodiments. However, these embodiments are for illustrative purposes only and should not be construed as limiting the scope and concept of the present invention. Additionally, it is obvious to those skilled in the art that various changes and modifications can be made without departing from the concept and scope of the present invention, and these changes and modifications are also within the scope of the appended claims.

[0204] [Examples]

[0205] The materials used in the following Examples and Comparative Examples are as follows.

[0206] (A) Matrix resin

[0207] (A-a1) Polyalkylene terephthalate: PBT resin with an intrinsic viscosity (at 20 °C) of 1.2 dl / g (weight-average molecular weight: 95,000 g / mol)

[0208] (A-a2) Polyalkylene terephthalate: PBT resin with an intrinsic viscosity (at 20 °C) of 0.98 dl / g

[0209] (A-a3) Polyalkylene terephthalate: PBT resin with an intrinsic viscosity (at 20 °C) of 0.84 dl / g (weight-average molecular weight: 75,000 g / mol)

[0210] (A-b1) Polycarbonate: Bisphenol A type PC resin with a melt flow index (at 300 °C, load: 1.2 kg) of 3 g / 10 min measured according to ISO 1133 (weight-average molecular weight: 70,000 g / mol)

[0211] (A-b2) Polycarbonate: Bisphenol A type PC resin with a melt flow index (at 300 °C, load: 1.2 kg) of 10 g / 10 min measured according to ISO 1133

[0212] (A-b3) Polycarbonate: Bisphenol A type PC resin with a melt flow index (at 300 °C, load: 1.2 kg) of 15 g / 10 min measured according to ISO 1133 (weight-average molecular weight: 44,000 g / mol)

[0213] (B-1) Impact modifier: BA type impact modifier with a core-shell structure, containing 60 wt% of the core (butyl acrylate rubber) and 40 wt% of the shell (acrylonitrile: 20 wt%, styrene: 80 wt%)

[0214] (B-2) Impact modifier: Poly(ethylene-butyl acrylate-glycidyl methacrylate) impact modifier with a non-core-shell structure (Elvaloy PTW, butyl acrylate: 27 wt%, Dupont Co.)

[0215] (C-a1) Flame retardant: Brominated epoxy oligomer flame retardant (CAS No. 28-70-1)

[0216] (C-a2) Flame retardant: Brominated aromatic carbonate oligomer flame retardant (C 22 H 15 Br7Cl2O4)

[0217] (C-b2) Flame retardant aid: Sb2O3

[0218] (D-1) Compatibilizer: ethylene-glycidyl methacrylate-vinyl acetate terpolymer (E-GMA-VA, GMA: 12 wt%, VA: 5 wt%)

[0219] (D-2) Compatibilizer: ethylene-glycidyl methacrylate-n-butyl acrylate terpolymer (E-GMA-BA, GMA: 5 wt%, BA: 28 wt%)

[0220] (E-1) Transesterification inhibitor: NaH2PO4

[0221] (E-2) Transesterification inhibitor: Na2HPO4

[0222] (E-3) Transesterification inhibitor: diphenyl phosphate

[0223] (F) UV stabilizer: benzotriazole compound (molecular weight: 448 g / mol, absorption wavelength range: 300 nm to 350 nm)

[0224] (G) Additional additive: Mix the following additional additives (G-1) to (G-3) in the same weight ratio (1:1:1) and add them.

[0225] (G-1) Heat stabilizer: phenolic antioxidant (pentaerythritol tetra[3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate])

[0226] (G-2) Lubricant: PE wax (low molecular weight polyethylene wax)

[0227] (G-3) Anti-dripping agent: polytetrafluoroethylene / PMMA (mixed in a weight ratio of 1:1)

[0228] Examples 1 to 7 and Comparative Examples 1 to 14

[0229] Feed the matrix resin (A), impact modifier (B), flame retardant (C), compatibilizer (D), transesterification inhibitor (E), UV stabilizer (F) and additional additive (G) into a super mixer according to the contents shown in Tables 1 to 3 and mix. Extrude the mixture using a twin-screw extruder (screw diameter: 40 mm, L / D = 40) at an extrusion temperature of 260 °C and a screw speed of 250 rpm.

[0230] The prepared granular thermoplastic resin composition was dried at 100 °C for at least 2 hours, and then injection molded using an injection machine at an injection temperature of 250 °C, a mold temperature of 60 °C, and an injection speed of 30 mm / sec to obtain specimens. The specimens were placed at room temperature (20 °C to 26 °C) for 48 hours, and then their physical properties were measured.

[0231] [Test Example]

[0232] The physical properties of the specimens prepared in the examples and comparative examples were measured according to the following methods, and the results are shown in Tables 4 to 6 below.

[0233] * Specific gravity: The specific gravity was measured using a hydrometer (Scott volumeter, model name: Version USP616) according to ASTM D792.

[0234] * Tensile strength (kgf / cm 2 ): The tensile strength was measured using specimens with dimensions of 165 mm (length) × 19 mm (width) × 3.2 mm (thickness) at a temperature of 23 °C and a test speed of 50 mm / min according to ASTM D638.

[0235] * Flexural strength and flexural modulus (kgf / cm 2 ): The flexural strength and flexural modulus were measured using specimens with dimensions of 127 mm (length) × 12.7 (width) × 3.2 mm (thickness) at a temperature of 23 °C, a test speed of 2.8 mm / min, and a span of 50 mm according to ASTM D790.

[0236] * Impact strength (kgf·cm / cm): The impact strength was measured using specimens with a thickness of 3.2 mm at a temperature of 23 °C and a notch width of 2.54 mm according to ASTM D256.

[0237] * Melt flow index (g / 10 min): The melt flow index was measured for 10 minutes using a melt index measuring device (GOETTFERT CO.) at a temperature of 250 °C and a load of 5 kg according to ASTM D1238.

[0238] * Flame retardancy: The flame retardancy was measured using injection specimens with dimensions of 127 mm (length) × 12.7 (width) × 0.8 mm (thickness) according to the UL 94 standard (vertical burning test).

[0239] *Appearance discoloration: By visually inspecting the color of the prepared extruded pellets, it is possible to determine whether the appearance has changed color. Based on the inherent color of the pellets of the composition according to the present invention (natural pellets; NP), when the pellets exhibit the desired white color, they are marked as "X" (no discoloration). When discoloration is observed with the naked eye, it is marked as "O".

[0240] *f1 WOM (%) : According to UL 746C (f1 level) regulations, using an accelerated aging test machine conforming to ASTM G151 (aging test machine, ATLAS Co., Ci4000, xenon arc lamp, quartz (inside) / S.Boro (outside) filter, the irradiation at 340 nm is 0.35 W / m 2 , the black panel temperature is 60 ± 3 °C), the impact specimens are exposed to ultraviolet light for 102 minutes, and the process of exposing the impact specimens to ultraviolet light and water spray for 18 minutes is set as 1 cycle, and an accelerated aging test of 1,000 hours is carried out. At this time, the f1 WOM value is expressed as the retention rate (%) of the impact strength measured before and after the accelerated aging test.

[0241] *f1 Flame retardancy (WOM, grade): According to UL 746C (f1 level) regulations, an accelerated aging test is carried out on the specimens used for measuring flame retardancy, and then its flame retardancy is measured according to the flame retardancy measurement method.

[0242] *f1 Hot water resistance index (%): A hot water resistance test is carried out according to UL 746C (f1 level) regulations. Specifically, the impact specimens are completely immersed in deionized water at 70 °C and left for 7 days. Then, the impact specimens are immersed in deionized water at 23 °C for 30 minutes. The retention rate of the impact strength measured before and after the hot water resistance test is expressed in %.

[0243] *f1 Flame retardancy (hot water resistance, grade): According to UL 746C (f1 level) regulations, a hot water resistance test is carried out on the specimens used for measuring flame retardancy. Then, the specimens are additionally conditioned for 2 weeks under the conditions of a temperature of 23 °C and a relative humidity of 50%. Then, the flame retardancy is measured according to the flame retardancy test.

[0244] [Table 1]

[0245]

[0246]

[0247] [Table 2]

[0248]

[0249]

[0250] [Table 3]

[0251]

[0252]

[0253] [Table 4]

[0254]

[0255] [Table 5]

[0256]

[0257]

[0258] [Table 6]

[0259]

[0260]

[0261] As shown in Tables 1 to 6, the tensile strength of the thermoplastic resin compositions according to Examples 1 to 7 of the present invention is 529 kgf / cm 2 or more, the flexural modulus is 20,300 kgf / cm 2 or more, the flexural strength is 823 kgf / cm 2 or more, the impact strength is 76 kgf·cm / cm or more, the melt flow index is 7.1 g / 10 min or more, and the flame retardancy rating is V-0. In addition, the impact strength retention rate of the thermoplastic resin compositions of Examples 1 to 7 before and after the hot water resistance test is 76.5% or more, and the impact strength retention rate before and after the accelerated aging test is 80.4% or more. In particular, the flame retardancy rating of the thermoplastic resin compositions of Examples 1 to 7 before and after the hot water resistance test and before and after the accelerated aging test has not changed, indicating that the thermoplastic resin compositions of Examples 1 to 7 have excellent mechanical strength, molding processability, flame retardancy, hot water resistance, and weather resistance compared with Comparative Examples 1 to 14 that exceed the present invention.

[0262] In addition, in the case of discoloration, the pellets of Examples 1 to 7 are visually white, indicating that no discoloration has occurred. On the other hand, the pellets of Comparative Example 12 are visually significantly gray, indicating deterioration of their appearance.

[0263] Therefore, it can be confirmed that the thermoplastic resin composition of the present invention has mechanical strength, molding processability, and flame retardancy above a certain level, and has excellent hot water resistance and weather resistance. Therefore, the thermoplastic resin composition of the present invention can be applied to the manufacture of outdoor electrical products for long-term use.

Claims

1. A thermoplastic resin composition comprising: 100 parts by weight of a matrix resin (A) comprising 1% to 99% by weight of a polyalkylene terephthalate and 1% to 99% by weight of a polycarbonate; 5.5 to 9 parts by weight of an impact modifier (B) having a core - shell structure; 10 to 30 parts by weight of a halogenated epoxy - type flame retardant (C); 2 to 4.5 parts by weight of a compatibilizer (D); and 0.1 to 2 parts by weight of a transesterification inhibitor (E), Among them, wherein the impact modifier having a core - shell structure is a butyl acrylate - type impact modifier containing a butyl acrylate rubber core and does not contain an ethylene - (butyl) acrylate copolymer, wherein the transesterification inhibitor is NaH2PO4, wherein the compatibilizer includes a glycidyl methacrylate - type compatibilizer containing vinyl acrylate, and wherein, according to ASTM D1238, the melt flow index of the thermoplastic resin composition measured at a temperature of 250 °C and a load of 5 kg is 7.0 g / 10 min or more, and the WOM value measured according to UL 746C is 70% or more, meeting the f1 level specified in UL 746C.

2. The thermoplastic resin composition according to claim 1, wherein The hot water resistance index value of the thermoplastic resin composition measured according to UL 746C is 50% or more, meeting the f1 level specified in UL 746C.

3. The thermoplastic resin composition according to claim 1, wherein, The intrinsic viscosity of the polyalkylene terephthalate is 0.9 dl / g to 1.3 dl / g.

4. The thermoplastic resin composition according to claim 1, wherein According to ASTM D1238, the melt flow index of the polycarbonate measured at a temperature of 250 °C and a load of 5 kg is 1 g / 10 min to 11 g / 10 min.

5. The thermoplastic resin composition according to claim 1, wherein The matrix resin comprises 40% to 60% by weight of a polyalkylene terephthalate and 40% to 60% by weight of a polycarbonate.

6. The thermoplastic resin composition according to claim 1, wherein, The halogenated epoxy - type flame retardant is a brominated epoxy - type flame retardant.

7. The thermoplastic resin composition according to claim 1, wherein The thermoplastic resin composition comprises 2 to 8 parts by weight of a flame retardant aid.

8. The thermoplastic resin composition according to claim 7, wherein, The flame retardant aid comprises antimony trioxide.

9. The thermoplastic resin composition according to claim 1, wherein The thermoplastic resin composition comprises 0.05 to 3 parts by weight of an ultraviolet stabilizer.

10. The thermoplastic resin composition according to claim 1, wherein, The thermoplastic resin composition meets the f1 level specified in UL746.

11. A molded article manufactured using the thermoplastic resin composition according to any one of claims 1 to 10.

12. The molded article according to claim 11, wherein, The molded article is an electrical box.

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