Polypropylene resin composition and article produced therefrom

Abstract

A polypropylene resin composition of the present invention comprises: about 100 parts by weight of a polypropylene resin; about 5-15 parts by weight of a styrene-based thermoplastic elastomer; about 2-5 parts by weight of zinc oxide; about 0.1-0.7 parts by weight of a silver-based compound; about 15-35 parts by weight of talc; and about 1-5 parts by weight of a carbon fiber. The polypropylene resin composition is excellent in terms of antibacterial properties, antifungal properties, antiviral properties, impact resistance, rigidity, thermal stability, and a balance of these physical properties, and may have melange texture, fabric texture, and the like.

Description

Polypropylene resin composition and molded article manufactured therefrom

[0001] The present invention relates to a polypropylene resin composition and a molded article manufactured therefrom. More specifically, the present invention relates to a polypropylene resin composition having excellent antibacterial, antifungal, antiviral, impact resistance, rigidity, thermal stability, and a balance of these properties, and having a melange texture, and a molded article manufactured therefrom.

[0002]

[0003] Since the coronavirus pandemic, demand for thermoplastic resin products with antibacterial, antifungal, and antiviral properties has increased. Furthermore, improved exterior properties are required for thermoplastic resin products to be used in automotive interiors.

[0004] Polypropylene resin has excellent chemical resistance, weather resistance, and processability, making it easy to manufacture into injection molded products, films, and blow molded products. It is a widely used material in fields such as electrical components, automobiles, and building materials.

[0005] Copper (Cu) compounds are widely known as materials that impart antibacterial, antifungal, and antiviral properties to these resins. However, when applied to thermoplastic resin compositions, copper compounds are difficult to process and suffer from discoloration and limited colorability due to reduced thermal stability, severely limiting the range of products to which they can be applied.

[0006] Accordingly, there is a need to develop a polypropylene resin composition that has excellent antibacterial, antifungal, antiviral, impact resistance, rigidity, heat stability, and a balance of these properties, and has a melange texture (a texture with a subtle tone of two or more colors mixed together) and a fiber texture to improve appearance.

[0007] The background technology of the present invention is disclosed in Korean Patent Publication No. 10-2020-0065139, etc.

[0008]

[0009] The purpose of the present invention is to provide a polypropylene resin composition having excellent antibacterial, antifungal, antiviral, impact resistance, rigidity, thermal stability, and a balance of these physical properties, and having a melange texture, a fiber texture, and the like.

[0010] Another object of the present invention is to provide a molded article formed from the polypropylene resin composition.

[0011] The above and other objects of the present invention can all be achieved by the present invention described below.

[0012]

[0013] 1. One aspect of the present invention relates to a polypropylene resin composition. The polypropylene resin composition comprises: about 100 parts by weight of a polypropylene resin; about 5 to about 15 parts by weight of a styrene-based thermoplastic elastomer; about 2 to about 5 parts by weight of zinc oxide; about 0.1 to about 0.7 parts by weight of a silver-based compound; about 15 to about 35 parts by weight of talc; and about 1 to about 5 parts by weight of carbon fiber.

[0014] 2. In the above 1 specific example, the polypropylene resin may include at least one of a homo polypropylene resin, a block polypropylene resin, and a random polypropylene resin.

[0015] 3. In the above 1 or 2 specific examples, the polypropylene resin may have a melt-flow index of about 10 to about 110 g / 10 min, measured under conditions of 230°C and 2.16 kg load, according to ASTM D1238.

[0016] 4. In the above 1 to 3 specific examples, the styrenic thermoplastic elastomer may include at least one of a styrene-ethylene / butylene-styrene (SEBS) copolymer, a styrene-ethylene-butylene (SEB) copolymer, a styrene-butadiene-styrene (SBS), and a styrene-isoprene-styrene (SIS).

[0017] 5. In the above specific examples 1 to 4, the styrene-based thermoplastic elastomer may have a weight average molecular weight of about 50,000 to about 120,000 g / mol.

[0018] 6. In the above 1 to 5 specific examples, the zinc oxide may have an average particle size of about 0.7 to about 1.5 ㎛ and a specific surface area BET of about 1 to about 7 m 2 / g may be.

[0019] 7. In the above 1 to 6 specific examples, the silver-based compound may include at least one of metallic silver, silver oxide, silver halide, and a carrier containing silver ions.

[0020] 8. In the above 1 to 7 specific examples, the polypropylene resin composition may further include a polyethylene resin.

[0021] 9. In the above 1 to 8 specific examples, the polypropylene resin composition may have an antibacterial activity value of about 2 to about 7, respectively, measured by inoculating Staphylococcus aureus and Escherichia coli on a 5 cm × 5 cm sized specimen according to the JIS Z 2801-1 antibacterial evaluation method and culturing it for 24 hours under conditions of 35°C and RH 90%.

[0022] 10. In the above 1 to 9 specific examples, the polypropylene resin composition may have an antifungal grade of 0 to 2, as measured by inoculating a 5 cm × 5 cm sized injection molded specimen with fungal spores and culturing it for 28 days under conditions of 29°C and RH 95%, based on the ISO 846:2019-A evaluation method.

[0023] 11. In the above 1 to 10 specific examples, the polypropylene resin composition may have an antiviral activity value of about 2 to about 7, measured by adding an influenza A virus (H3N2): ATCC VR-1679 virus solution dropwise to a 5 cm × 5 cm sized specimen according to the ISO 21702:2019 evaluation method and exposing it to the virus for 24 hours under conditions of 25°C and RH 50%.

[0024] 12. In the above 1 to 11 specific examples, the polypropylene resin composition has a notched Izod impact strength of about 4 to about 12 kJ / m of a 4 mm thick specimen measured according to ISO 180. 2 It could be.

[0025] 13. In the above 1 to 12 specific examples, the polypropylene resin composition may have a tensile strength of about 20 to about 30 MPa of a 4 mm thick specimen measured under a condition of 50 mm / min according to ISO 527, a flexural strength of about 30 to about 42 MPa of a 4 mm thick specimen measured under a condition of 2 mm / min according to ISO 178, and a flexural modulus of about 1,800 to about 2,700 MPa of a 4 mm thick specimen measured under a condition of 2 mm / min according to ISO 178.

[0026] 14. In the above 1 to 11 specific examples, the polypropylene resin composition may have a heat distortion temperature (HDT) of about 106 to about 120°C of a 4 mm thick specimen measured under conditions of 0.45 MPa and a heating rate of 120°C / hr according to ISO 75.

[0027] 15. Another aspect of the present invention relates to a molded article. The molded article is characterized in that it is formed from a polypropylene resin composition according to any one of 1 to 14.

[0028]

[0029] The present invention has the effect of providing a polypropylene resin composition having excellent antibacterial, antifungal, antiviral, impact resistance, rigidity, thermal stability, and a balance of these physical properties, and having a melange texture, a fiber texture, and the like, and a molded article formed therefrom.

[0030]

[0031] Hereinafter, the present invention will be described in detail as follows.

[0032] A polypropylene resin composition according to the present invention comprises (A) a polypropylene resin; (B) a styrene-based thermoplastic elastomer; (C) zinc oxide; (D) a silver-based compound; (E) talc; and (F) carbon fiber.

[0033] In this specification, “a to b” indicating a numerical range is defined as “≥a and ≤b”.

[0034]

[0035] (A) Polypropylene resin

[0036] According to one specific example of the present invention, a polypropylene resin is applied together with a styrene-based thermoplastic elastomer, zinc oxide, a silver-based compound, talc, carbon fiber, etc., to improve the antibacterial properties, antifungal properties, antiviral properties, impact resistance, rigidity, thermal stability, and balance of these physical properties of the polypropylene resin composition, and to provide a melange texture, a fiber texture, etc., and a polypropylene resin applied to a typical thermoplastic resin composition can be used.

[0037] In specific examples, the polypropylene resin may include a homopolypropylene resin, a block polypropylene resin, a random polypropylene resin, a combination thereof, and the like. Here, the block polypropylene resin may be a block polypropylene resin composed of a homopolypropylene block and an ethylene-propylene copolymer block and / or a homopolyethylene block, and the random polypropylene resin may be a propylene-ethylene random copolymer. For example, the polypropylene resin may be a block polypropylene resin.

[0038] In a specific example, the polypropylene resin may have a melt flow index (MI) of about 10 to about 110 g / 10 min, for example, about 15 to about 95 g / 10 min, measured under conditions of 230°C and a load of 2.16 kg according to ASTM D1238. Within this range, the mechanical properties, molding processability, etc. of the polypropylene resin composition may be excellent.

[0039]

[0040] (B) Styrenic thermoplastic elastomer

[0041] According to one specific example of the present invention, a styrenic thermoplastic elastomer is applied to a polypropylene resin together with zinc oxide, a silver-based compound, talc, carbon fiber, etc., to improve the antibacterial properties, antifungal properties, antiviral properties, impact resistance, rigidity, thermal stability, and the balance of these physical properties of the polypropylene resin composition, and to have a melange texture, a fiber texture, etc., and a styrenic thermoplastic elastomer used in a typical thermoplastic resin composition can be used.

[0042] In specific examples, the styrenic thermoplastic elastomer may include a styrene-ethylene / butylene-styrene (SEBS) copolymer, a styrene-ethylene-butylene (SEB) copolymer, a styrene-butadiene-styrene (SBS), a styrene-isoprene-styrene (SIS), combinations thereof, and the like.

[0043] In a specific example, the styrene-based thermoplastic elastomer may have a weight average molecular weight measured by gel permeation chromatography (GPC) of about 50,000 to about 120,000 g / mol, for example, about 55,000 to about 110,000 g / mol. Within this range, the mechanical properties of the polypropylene resin composition, such as impact resistance at room temperature and impact resistance at low temperature, may be excellent.

[0044] In a specific example, the styrenic thermoplastic elastomer may be included in an amount of about 5 to about 15 parts by weight, for example, about 6 to about 12 parts by weight, based on about 100 parts by weight of the polypropylene resin. If the content of the styrenic thermoplastic elastomer is less than about 5 parts by weight based on about 100 parts by weight of the polypropylene resin, there is a concern that the impact resistance (room temperature impact resistance, low temperature impact resistance) of the polypropylene resin composition may be reduced, and if it exceeds about 15 parts by weight, there is a concern that the rigidity, thermal stability, etc. of the polypropylene resin composition may be reduced.

[0045]

[0046] (C) Zinc oxide

[0047] According to one specific example of the present invention, zinc oxide is applied to a polypropylene resin together with a styrene-based thermoplastic elastomer, a silver-based compound, talc, and carbon fibers, thereby improving the antibacterial properties, antifungal properties, antiviral properties, impact resistance, rigidity, thermal stability, and balance of these physical properties of the polypropylene resin composition, and imparting a melange texture, a fiber texture, and the like. Zinc oxide used in a typical thermoplastic resin composition can be used.

[0048] In a specific example, the zinc oxide may have an average particle size (D50) of about 0.7 to about 1.5 ㎛ as measured using a particle size analyzer (Beckman Coulter, Laser Diffraction Particle Size Analyzer LS I3 320 equipment) in accordance with ISO 13320-1. In addition, the zinc oxide may have a specific surface area BET of about 1 to about 7 m as measured using a BET analysis equipment (Micromeritics, Surface Area and Porosity Analyzer ASAP 2020 equipment) in accordance with ASTM C 1251:95 using a nitrogen gas adsorption method. 2 / g, and the purity may be about 99% or more. In the above range, the polypropylene resin composition may have excellent antibacterial, antifungal, and antiviral properties.

[0049] In a specific example, the zinc oxide may be included in an amount of about 2 to about 5 parts by weight, for example, about 3 to about 4.5 parts by weight, relative to about 100 parts by weight of the polypropylene resin. If the content of the zinc oxide is less than about 2 parts by weight relative to about 100 parts by weight of the polypropylene resin, there is a concern that the antibacterial properties, antifungal properties, antiviral properties, etc. of the polypropylene resin composition may be reduced, and if it exceeds about 5 parts by weight, there is a concern that the impact resistance, etc. of the polypropylene resin composition may be reduced.

[0050]

[0051] (D) Silver compounds

[0052] According to one specific example of the present invention, a silver (Ag)-based compound is applied to a polypropylene resin together with a styrene-based thermoplastic elastomer, zinc oxide, talc, and carbon fiber, thereby improving the antibacterial, antifungal, antiviral, impact resistance, rigidity, thermal stability, and the balance of these physical properties of the polypropylene resin composition, and providing a melange texture, a fiber texture, and the like. The silver-based compound is an antibacterial agent, and is not particularly limited as long as it is a compound containing a silver component, and may include, for example, metallic silver, silver oxide, silver halide, a carrier containing silver ions, and combinations thereof. Among these, a carrier containing silver ions may be used. Examples of the carrier include zeolite, silica gel, calcium phosphate, zirconium phosphate, sodium zirconium phosphate, sodium phosphate-hydrogen zirconium phosphate, and the like. The carrier preferably has a porous structure. Since the porous support can retain the silver component within its interior, not only can the content of the silver component be increased, but also the sustained performance (maintenance performance) of the silver component is improved. Specifically, silver sodium hydrogen zirconium phosphate or the like can be used as the silver-based compound.

[0053] In a specific example, the silver compound may have an average particle size (D50) of about 15 μm or less, for example, about 0.1 to about 12 μm, as measured using a particle size analyzer (Beckman Coulter, Laser Diffraction Particle Size Analyzer, LS 13 320 equipment).

[0054] In a specific example, the silver-based compound may be included in an amount of about 0.1 to about 0.7 parts by weight, for example, about 0.1 to about 0.5 parts by weight, relative to about 100 parts by weight of the polypropylene resin. If the content of the silver-based compound is less than about 0.1 parts by weight relative to about 100 parts by weight of the polypropylene resin, there is a concern that the antiviral properties, etc. of the polypropylene resin composition may be reduced, and if it exceeds about 0.7 parts by weight, there is a concern that the impact resistance, etc. of the polypropylene resin composition may be reduced.

[0055] In a specific example, the weight ratio of the zinc oxide and the silver compound may be from about 1:0.02 to about 1:0.15, for example from about 1:0.025 to about 1:0.134. In this range, the antibacterial properties, antifungal properties, antiviral properties, mechanical properties, etc. of the polypropylene resin composition may be more excellent.

[0056]

[0057] (E) Talk

[0058] According to one specific example of the present invention, talc is applied to a polypropylene resin together with a styrene-based thermoplastic elastomer, zinc oxide, a silver-based compound, carbon fiber, etc., to improve the antibacterial properties, antifungal properties, antiviral properties, impact resistance, rigidity, thermal stability, and the balance of these physical properties of the polypropylene resin composition, and to provide a melange texture, a fiber texture, etc., and a plate-shaped talc used in a typical thermoplastic resin composition can be used.

[0059] In a specific example, the talc may have an average particle size of about 3 to about 10 μm, for example, about 4 to about 6 μm, as measured by a particle size measuring device (Malvern Panalytical, Mastersizer 3000). Within this range, the tensile strength, flexural strength, etc. of the polypropylene resin composition may be excellent.

[0060] In a specific example, the talc may be included in an amount of about 15 to about 35 parts by weight, for example, about 20 to about 30 parts by weight, relative to about 100 parts by weight of the polypropylene resin. If the amount of the talc is less than about 15 parts by weight relative to about 100 parts by weight of the polypropylene resin, there is a concern that the rigidity, thermal stability, etc. of the polypropylene resin composition may be reduced, and if it exceeds about 35 parts by weight, there is a concern that the impact resistance, etc. of the polypropylene resin composition may be reduced.

[0061]

[0062] (F) Carbon fiber

[0063] According to one specific example of the present invention, carbon fiber is applied to a polypropylene resin together with a styrene-based thermoplastic elastomer, zinc oxide, a silver-based compound, talc, etc., to improve the antibacterial properties, antifungal properties, antiviral properties, impact resistance, rigidity, thermal stability, and balance of these physical properties of the polypropylene resin composition, and to have a melange texture, a fiber texture, etc., and carbon fibers used in a typical thermoplastic resin composition can be used.

[0064] In a specific example, the carbon fibers may have an average diameter of about 10 to about 25 μm, for example, about 16 to about 20 μm, as measured by an optical microscope, and an average length of about 0.1 to about 2 mm, for example, about 0.5 to about 1.5 mm. Within this range, the rigidity of the polypropylene resin composition may be excellent, and a melange texture, a fiber texture, etc. may be imparted to the polypropylene resin composition and the molded product.

[0065] In a specific example, the carbon fiber may be included in an amount of about 1 to about 5 parts by weight, for example, about 1.5 to about 3 parts by weight, relative to about 100 parts by weight of the polypropylene resin. If the content of the carbon fiber is less than about 1 part by weight relative to about 100 parts by weight of the polypropylene resin, there is a concern that the melange texture may not be sufficiently implemented on the appearance of the polypropylene resin composition, and if it exceeds about 5 parts by weight, there is a concern that the impact resistance of the polypropylene resin composition may be reduced, and a foreign body sensation may be excessively expressed on the appearance.

[0066]

[0067] (G) polyethylene resin

[0068] A polypropylene resin composition according to one specific embodiment of the present invention may further include a polyethylene resin. The polyethylene resin may be a conventional polyethylene resin (e.g., low-density polyethylene (LDPE), medium-density polyethylene (MDPE), high-density polyethylene (HDPE), linear low-density polyethylene (LLDPE)), a bio-polyethylene resin, a combination thereof, or the like. When the polyethylene resin is applied, the impact resistance, appearance properties (e.g., gloss), etc. of the polypropylene resin composition may be further improved. Here, the bio-polyethylene resin refers to an eco-friendly product made by distilling / dehydrating / polymerizing ethanol from sugarcane residue left after extracting sugar.

[0069] In a specific example, the polyethylene resin may have a melt-flow index (MI) of about 20 to about 40 g / 10 min, for example, about 23 to about 32 g / 10 min, measured under conditions of 230°C and a load of 2.16 kg according to ASTM D1238. Within this range, the impact resistance, appearance characteristics, etc. of the polypropylene resin composition may be excellent.

[0070] In a specific example, when applying the polyethylene resin, the content may be about 10 to about 25 parts by weight, for example, about 11 to about 20 parts by weight, based on about 100 parts by weight of the polypropylene resin. Within this range, the impact resistance, appearance characteristics, etc. of the polypropylene resin composition may be further improved.

[0071]

[0072] A polypropylene resin composition according to one embodiment of the present invention may further include additives included in conventional thermoplastic resin compositions. Examples of such additives include, but are not limited to, antioxidants, flame retardants, anti-dripping agents, UV stabilizers, release agents, nucleating agents, pigments, dyes, and mixtures thereof.

[0073] In a specific example, when the additive is used, the content may be about 0.001 to about 40 parts by weight, for example, about 0.01 to about 10 parts by weight, based on about 100 parts by weight of the polypropylene resin.

[0074]

[0075] A polypropylene resin composition according to one specific example of the present invention may be in the form of pellets obtained by mixing the above components and melt-extruding them at about 170 to about 240°C, for example, about 190 to about 230°C, using a conventional twin-screw extruder.

[0076] In a specific example, the polypropylene resin composition may have an antibacterial activity value of about 2 to about 7, for example, about 3 to about 5, measured by inoculating Staphylococcus aureus and Escherichia coli on a 5 cm × 5 cm sized specimen according to the JIS Z 2801-1 antibacterial evaluation method and culturing for 24 hours under conditions of 35°C and RH 90%.

[0077] In a specific example, the polypropylene resin composition may have an antifungal grade of 0 to 2, as measured by inoculating a 5 cm × 5 cm injection molded specimen with fungal spores and culturing it for 28 days under conditions of 29°C and RH 95% according to the ISO 846:2019-A evaluation method.

[0078] In a specific example, the polypropylene resin composition may have an antiviral activity value of about 2 to about 7, for example, about 2.1 to about 5, measured by adding an influenza A virus (H3N2): ATCC VR-1679 virus solution dropwise to a 5 cm × 5 cm sized specimen according to the ISO 21702:2019 evaluation method and exposing the specimen to the virus for 24 hours under conditions of 25°C and RH 50%.

[0079] In a specific example, the polypropylene resin composition has a notched Izod impact strength of about 4 to about 12 kJ / m of a 4 mm thick specimen measured according to ISO 180. 2 , for example, about 4 to about 10 kJ / m 2 It could be.

[0080] In a specific example, the polypropylene resin composition may have a tensile strength of about 20 to about 30 MPa, for example, about 23 to about 28 MPa, of a 4 mm thick specimen measured under conditions of 50 mm / min according to ISO 527.

[0081] In a specific example, the polypropylene resin composition may have a flexural strength of about 30 to about 42 MPa, for example, about 31 to about 40 MPa, of a 4 mm thick specimen measured under conditions of 2 mm / min according to ISO 178.

[0082] In a specific example, the polypropylene resin composition may have a flexural modulus of about 1,800 to about 2,700 MPa, for example, about 1,850 to about 2,600 MPa, of a 4 mm thick specimen measured under conditions of 2 mm / min according to ISO 178.

[0083] In a specific example, the polypropylene resin composition may have a heat distortion temperature (HDT) of about 106 to about 120°C, for example, about 106 to about 119°C, of ​​a 4 mm thick specimen measured under conditions of 0.45 MPa and a heating rate of 120°C / hr according to ISO 75.

[0084]

[0085] The molded article according to the present invention is formed from the polypropylene resin composition. The polypropylene resin composition can be manufactured in the form of pellets, and the manufactured pellets can be manufactured into various molded articles (products) through various molding methods such as injection molding, extrusion molding, vacuum molding, and casting molding. Such molding methods are well known to those skilled in the art to which the present invention pertains.

[0086] In a specific example, the molded product has excellent antibacterial, antifungal, antiviral, impact resistance, rigidity, thermal stability, and a balance of these physical properties, and has a melange texture, a fiber texture, and the like, and is therefore useful as an automobile interior material, home appliances, and the like.

[0087]

[0088] Hereinafter, the present invention will be described in more detail through examples; however, these examples are for the purpose of explanation only and should not be construed as limiting the present invention.

[0089]

[0090] Example

[0091] Below, the specifications of each component used in the examples and comparative examples are as follows.

[0092] (A) Polypropylene resin

[0093] Block polypropylene resin (ethylene-propylene block copolymer, B-PP, manufacturer: Lotte Chemical, product name: JSS-370N) was used.

[0094] (B) Styrenic thermoplastic elastomer

[0095] Styrene-ethylene / butylene-styrene (SEBS) copolymer (manufacturer: Kraton Corp., product name: G1657) was used.

[0096] (C) Zinc oxide

[0097] Zinc oxide (Manufacturer: Hanil Chemical, Product Name: KS-1) was used.

[0098] (D) Silver (Ag) compounds

[0099] Silver phosphate glass (manufacturer: Fuji Chemical Industries, LTD. Product name: BM-102SD) was used.

[0100] (E) Talk

[0101] Talc (Manufacturer: KOCH, Product Name: KC-5000CA) was used.

[0102] (F) Carbon fiber

[0103] Carbon fiber (Manufacturer: KRECA, Product name: KCF-100) was used.

[0104] (G) polyethylene resin

[0105] Biopolyethylene resin (manufacturer: Braskem, product name: SHA7260) was used.

[0106]

[0107] Examples 1 to 14 and Comparative Examples 1 to 10

[0108] Each of the above components was added in the amounts shown in Tables 1, 2, 3, and 4 below, and then extruded at about 220°C to produce pellets. The extrusion was performed using a twin-screw extruder with an L / D of 36 and a diameter of 45 mm. The manufactured pellets were dried at about 80°C for about 2 hours or more, and then injected using a 220-ton injection molding machine (molding temperature: about 220°C, mold temperature: about 40°C) to produce test pieces. The physical properties of the manufactured test pieces were evaluated using the following methods, and the results are shown in Tables 1, 2, 3, and 4 below.

[0109]

[0110] Method of measuring physical properties

[0111] (1) Antibacterial evaluation: According to the JIS Z 2801-1 antibacterial evaluation method, Staphylococcus aureus and Escherichia coli were inoculated onto 5 cm × 5 cm sized specimens, and the antibacterial activity was measured after culturing for 24 hours under conditions of 35°C and RH 90%.

[0112] (2) Antifungal evaluation: According to the ISO 846:2019 - A evaluation method, mold spores were inoculated onto 5 cm × 5 cm injection specimens, cultured for 28 days under conditions of 29°C and RH 95%, and the antifungal grade was measured using a microscope.

[0113] (Grade 0: No mold visible under a microscope (50x magnification), Grade 1: Mold not visible to the naked eye, but clearly visible under a microscope (Grade 1a: Mold not visible to the naked eye, but clearly visible under a microscope (25% or less of the specimen surface), Grade 1b: Mold not visible to the naked eye, but clearly visible under a microscope (50% or less of the specimen surface), Grade 1c: Mold not visible to the naked eye, but clearly visible under a microscope (more than 50% of the specimen surface)), Grade 2: Mold clearly visible to the naked eye (25% or less of the specimen surface), Grade 3: Mold clearly visible to the naked eye (50% or less of the specimen surface), Grade 4: Significant mold growth visible to the naked eye (more than 50% of the specimen surface), Grade 5: Mold growth covering the entire specimen surface)

[0114] (3) Antiviral activity evaluation: The polypropylene resin composition was subjected to an antiviral activity test in which an influenza A virus (H3N2): ATCC VR-1679 virus solution was added dropwise to a 5 cm × 5 cm sized specimen according to the ISO 21702:2019 evaluation method, and the antiviral activity value was measured after exposure to the virus for 24 hours under conditions of 25°C and RH 50%.

[0115] (4) Notched Izod impact strength (unit: kJ / m) 2 ): The notched Izod impact strength of 4.0 mm thick specimens was measured according to ISO 180.

[0116] (5) Tensile strength (unit: MPa): The tensile strength of a 4.0 mm thick specimen was measured under conditions of 50 mm / min according to ISO 527.

[0117] (6) Flexural strength (unit: MPa): The flexural strength of a 4.0 mm thick specimen was measured under conditions of 2 mm / min according to ISO 178.

[0118] (7) Flexural modulus (unit: MPa): The flexural modulus of a 4.0 mm thick specimen was measured under conditions of 2 mm / min according to ISO 178.

[0119] (8) Heat distortion temperature (unit: ℃): According to ISO 75, the heat distortion temperature (HDT) of a 4.0 mm thick specimen was measured under the conditions of 0.45 MPa and a heating rate of 120℃ / hr.

[0120]

[0121] Example 1234567 (A) (parts by weight) 100100100100100100100 (B) (parts by weight) 69.5129.59.59.59.5 (C) (parts by weight) 3.83.83.834.53.83.8 (D) (parts by weight) 0.160.160.160.160.160.10.5 (E) (parts by weight) 25.425.425.425.425.425.425.425.4 (F) (parts by weight) 2.22.22.22.22.22.22.22.2 (G) (parts by weight)-------Antibacterial activity value 4.74.74.74.74.74.74.7 Antifungal grade 22221c21c Antiviral Activation value 2.4 2.4 2.4 2.1 3.5 2.4 2.8 Notched Izod impact strength 4.0 5.4 7.5 5.5 5.3 5.4 5.4 Tensile strength 27.2 2.5 7.2 3.8 2.5 7.2 5.7 2.5 5.5 2.5 7.2 6. Flexural strength 38.8 3.6 ...

[0122]

[0123] Example 891011121314(A) (parts by weight)100100100100100100100100(B) (parts by weight)9.59.59.59.59.59.59.5(C) (parts by weight)3.83.83.83.83.83.83.8(D) (parts by weight)0.160.160.160.160.160.160.160.16(E) (parts by weight)203025.425.425.425.425.4(F) (parts by weight)2.22.21.532.22.22.2(G) (parts by weight)----1115.820Antibacterial activity value4.74.74.74.74.74.74.7Antifungal activity Grade 2222222 Antiviral activity 2.4 2.4 2.4 2.4 2.4 2.4 2.4 2.4 2.4 2.4 2.4 Notched Izod impact strength 6.6 4.9 5.7 5.3 5.1 7.6 0 Tensile strength 24.4 2.6 4.2 2.5 8.2 2.5 8.2 2.5 1 Flexural strength 32.9 3.4 3.3 6.8 3.7 0 3.8 0 3.7 8.3 6.9 Flexural modulus 1,91 3.2 2.3 2.0 2.3 1.7 2.3 9.0 2.2 9.7 2.2 3.6 2.1 8.8 Heat deflection temperature 108 113 113 115 115 114 112

[0124]

[0125] Comparative Example 12345 (A) (Parts by weight) 100 100 100 100 100 (B) (Parts by weight) 3 17 9.5 9.5 9.5 (C) (Parts by weight) 3.8 3.8 18 3.8 (D) (Parts by weight) 0.16 0.16 0.16 0.16 0.01 (E) (Parts by weight) 25.4 25.4 25.4 25.4 25.4 25.4 (F) (Parts by weight) 2.22 22.22.22.22.2 (G) (Parts by weight)----- Antibacterial activity value 4.7 4.7 0.9 4.7 3.6 Antifungal grade 2241a2 Antiviral activity value 2.4 2.4 0.9 4.4 1.8 Notched Izod Impact strength 3.3 14.35.4 3.75.1 Tensile strength 27.8 21.0 25.8 24.0 24.9 Flexural strength 38.9 27.9 37.1 35.1 36.4 Flexural modulus 2,510 1,682 2,361 2,195 2,245 Heat deflection temperature 117 104 115 111113

[0126]

[0127] Comparative Example 678910 (A) (parts by weight) 100 100 100 100 100 (B) (parts by weight) 9.5 9.5 9.5 9.5 9.5 9.5 9.5 (C) (parts by weight) 3.8 3.8 3.8 3.8 3.8 3.8 (D) (parts by weight) 1.5 0.1 60.1 60.1 60.1 6 (E) (parts by weight) 25.4 133 725.4 25.4 (F) (parts by weight) 2.2 2.2 2.2 2.2 2.5 9 (G) (parts by weight)----- Antibacterial activity value 4.7 4.7 4.7 4.7 4.7 Antifungal grade 1b 2222 Antiviral activity value 3.3 2.4 2.4 2.4 2.4 2.4 Notched Izod Impact strength 3.97.63.85.63.9Tensile strength 23.822.827.325.626.3Flexural strength 36.129.838.836.737.3Flexural modulus 2,2771,7652,6732,3012,469Heat deflection temperature 113105121114116

[0128]

[0129] From the above results, it can be seen that the polypropylene resin composition of the present invention has excellent antibacterial properties, antifungal properties, antiviral properties, impact resistance (notched Izod impact strength), rigidity (tensile strength, flexural strength, flexural modulus), thermal stability (heat distortion temperature), and a balance of these physical properties, and it was confirmed through visual evaluation that it has a melange texture and a fiber texture.

[0130] On the other hand, in the case of Comparative Example 1 in which the content of the styrenic thermoplastic elastomer is less than the range of the present invention, it can be seen that impact resistance, etc. are reduced, and in the case of Comparative Example 2 in which the content of the styrenic thermoplastic elastomer exceeds the range of the present invention, it can be seen that rigidity, thermal stability, etc. are reduced. In the case of Comparative Example 3 in which the content of zinc oxide is less than the range of the present invention, it can be seen that antibacterial properties, antifungal properties, antiviral properties, etc. are reduced, and in the case of Comparative Example 4 in which the content of zinc oxide exceeds the range of the present invention, it can be seen that impact resistance, etc. are reduced, and in the case of Comparative Example 5 in which the content of the silver-based compound is less than the range of the present invention, it can be seen that antiviral properties, etc. are reduced, and in the case of Comparative Example 6 in which the content of the silver-based compound exceeds the range of the present invention, it can be seen that impact resistance, etc. are reduced. In addition, in the case of Comparative Example 7, where the content of talc is below the range of the present invention, it can be seen that rigidity, thermal stability, etc. are reduced, and in the case of Comparative Example 8, where the content of talc is above the range of the present invention, it can be seen that impact resistance, etc. are reduced, and in the case of Comparative Example 9, where the content of carbon fiber is below the range of the present invention, it was confirmed that the melange texture was not sufficiently implemented on the exterior, and in the case of Comparative Example 10, where the content of carbon fiber is above the range of the present invention, it was confirmed that impact resistance, etc. were reduced and a foreign body sensation was excessively expressed on the exterior.

[0131]

[0132] The present invention has been described with reference to exemplary embodiments. Those skilled in the art will appreciate that the present invention can be implemented in modified forms without departing from its essential characteristics. Therefore, the disclosed embodiments should be considered illustrative rather than limiting. The scope of the present invention is set forth in the claims, not the foregoing description, and all differences within the scope equivalent thereto should be construed as being encompassed by the present invention.

Claims

1. About 100 parts by weight of polypropylene resin; About 5 to about 15 parts by weight of a styrenic thermoplastic elastomer; About 2 to about 5 parts by weight of zinc oxide; About 0.1 to about 0.7 parts by weight of a silver compound; About 15 to about 35 parts by weight of talc; and A polypropylene resin composition comprising about 1 to about 5 parts by weight of carbon fiber.

2. A polypropylene resin composition according to claim 1, characterized in that the polypropylene resin comprises at least one of a homo polypropylene resin, a block polypropylene resin, and a random polypropylene resin.

3. A polypropylene resin composition according to claim 1, characterized in that the polypropylene resin has a melt-flow index of about 10 to about 110 g / 10 min, measured under conditions of 230°C and 2.16 kg load, according to ASTM D1238.

4. A polypropylene resin composition according to claim 1, wherein the styrene-based thermoplastic elastomer comprises at least one of a styrene-ethylene / butylene-styrene (SEBS) copolymer, a styrene-ethylene-butylene (SEB) copolymer, a styrene-butadiene-styrene (SBS), and a styrene-isoprene-styrene (SIS).

5. A polypropylene resin composition according to claim 1, wherein the styrene-based thermoplastic elastomer has a weight average molecular weight of about 50,000 to about 120,000 g / mol.

6. A polypropylene resin composition according to claim 1, wherein the zinc oxide has an average particle size of about 0.7 to about 1.5 ㎛ and a specific surface area BET of about 1 to about 7 m2 / g.

7. A polypropylene resin composition according to claim 1, characterized in that the silver-based compound comprises at least one of metallic silver, silver oxide, silver halide, and a carrier containing silver ions.

8. A polypropylene resin composition according to claim 1, characterized in that the polypropylene resin composition further comprises a polyethylene resin.

9. In the first paragraph, the polypropylene resin composition is characterized in that the antibacterial activity value measured after inoculating Staphylococcus aureus and Escherichia coli on a 5 cm × 5 cm sized specimen and culturing for 24 hours under conditions of 35°C and RH 90% according to the JIS Z 2801-1 antibacterial evaluation method is about 2 to about 7, respectively.

10. In the first paragraph, the polypropylene resin composition is characterized in that the antifungal grade is 0 to 2, as measured by inoculating mold spores on a 5 cm × 5 cm injection molded specimen and culturing it for 28 days under conditions of 29°C and RH 95% according to the ISO 846:2019 - A evaluation method.

11. In the first paragraph, the polypropylene resin composition is characterized in that the antiviral activity value measured after dropping the influenza A virus (H3N2): ATCC VR-1679 virus solution on a 5 cm × 5 cm sized specimen and exposing it to the virus under conditions of 25°C and RH 50% for 24 hours is about 2 to about 7, based on the ISO 21702:2019 evaluation method.

12. In the first paragraph, the polypropylene resin composition has a notched Izod impact strength of about 4 to about 12 kJ / m of a 4 mm thick specimen measured according to ISO 180. 2 A polypropylene resin composition characterized by:

13. In the first paragraph, the polypropylene resin composition is characterized in that the tensile strength of a 4 mm thick specimen measured under a condition of 50 mm / min according to ISO 527 is about 20 to about 30 MPa, the flexural strength of a 4 mm thick specimen measured under a condition of 2 mm / min according to ISO 178 is about 30 to about 42 Mpa, and the flexural modulus of a 4 mm thick specimen measured under a condition of 2 mm / min according to ISO 178 is about 1,800 to about 2,700 MPa.

14. In the first paragraph, the polypropylene resin composition is characterized in that the heat distortion temperature (HDT) of a 4 mm thick specimen measured under the conditions of 0.45 MPa and a heating rate of 120°C / hr according to ISO 75 is about 106 to about 120°C.

15. A molded product characterized by being formed from a polypropylene resin composition according to any one of claims 1 to 14.