KR102209155B1 - Polypropylene Resin Composition with Excellent Platability - Google Patents

Abstract

The present invention relates to a polypropylene resin composition having excellent plating properties. The polypropylene resin composition according to the present invention is excellent in mechanical properties such as impact resistance and stiffness, and plating properties, and thus molded articles manufactured therefrom can be effectively used for automobile interior and exterior parts, electronic and home appliance parts, construction and industrial materials, etc.

Description

Polypropylene Resin Composition with Excellent Platability}

The present invention relates to a polypropylene resin composition having excellent plating properties. Specifically, the present invention relates to a polypropylene resin composition having excellent mechanical properties such as impact resistance and stiffness as well as excellent plating properties compared to the conventional polypropylene resin composition.

Polypropylene resin, a kind of general-purpose resin, has excellent mechanical properties, moldability and chemical resistance, as well as economical properties, so it is a material such as automobile interior and exterior parts, electrical and home appliance parts, construction and industrial materials, films, pipes, and wires. It is widely used as

However, since such polypropylene resin is basically a non-polar material, adhesion is poor during plating. Therefore, when plating a polypropylene resin molded article, defects such as partial peeling of the plating layer may occur.

Meanwhile, as a plastic material for plating, acrylonitrile-butadiene-styrene copolymer (ABS) has been widely used. In addition, polycarbonate/acrylonitrile-butadiene-styrene copolymer (PC/ABS) is sometimes used as a plastic material for plating that requires excellent mechanical properties and heat resistance.

However, since ABS resins are not only expensive, but supply of materials is unstable, attempts have been made to use various engineering plastic materials for plating. As part of this, attempts are being made to utilize polypropylene resin, which is not only excellent in processability and mechanical properties, but also inexpensively, as a plastic material for plating.

For example, in Korean Patent Application Publication No. 10-2001-0046313, an attempt was made to mix an ethylene-propylene rubber with a polypropylene resin and use calcium carbonate capable of imparting a polar group. However, this polypropylene resin composition needs to be further improved in mechanical properties and plating properties.

Therefore, development of a polypropylene resin composition excellent in both mechanical properties and plating properties while using a polypropylene resin as a main material is required.

Republic of Korea Patent Application Publication No. 10-2001-0046313

Accordingly, an object of the present invention is to provide a polypropylene resin composition having excellent mechanical properties and plating properties.

According to an embodiment of the present invention for achieving the above object, based on the total weight of the components (A) to (D), (A) 40 to 70% by weight of a propylene block copolymer resin; (B) 5 to 20% by weight of thermoplastic elastomer; (C) 5 to 20% by weight of a styrenic block copolymer; And (D) 5 to 30 wt% of a fine inorganic filler having an average diameter in the range of 0.5 to 1 µm, and based on 100 parts by weight of components (A) to (D), (E) 0.01 to 1 weight of polyolefin wax %; And (F) a polypropylene resin composition further comprising 0.01 to 1% by weight of calcium stearate is provided.

Specifically, the propylene block copolymer resin (A) may be obtained by stepwise polymerization of a propylene homopolymer or an ethylene-propylene random copolymer and a propylene-α-olefin rubber copolymer in a reactor. Here, the α-olefin in the propylene-α-olefin rubber copolymer may be at least one selected from the group consisting of ethylene, 1-butene, 1-hexene, and 4-methyl-1-pentene. Of these, ethylene is most preferred.

The content of the solvent extract (xylene soluble) in the propylene block copolymer resin (A) may be 10 to 30% by weight.

The propylene block copolymer resin (A) may have a melt index of 10 to 100 g/10 minutes when measured with a load of 2.16 kg at 230° C. according to ISO 1133.

In addition, the propylene block copolymer resin (A) may have a polydispersity (PI) of 2.5 to 6.5.

The thermoplastic elastomer (B) is a rubber in which ethylene and an α-olefin having 4 to 8 carbon atoms are copolymerized. Specifically, the thermoplastic elastomer (B) is ethylene-1-butene rubber, ethylene-butylene rubber, ethylene-1-pentene rubber, ethylene-1-hexene rubber, ethylene-1-heptene rubber, ethylene-1-octene rubber, and It may be at least one member selected from the group consisting of ethylene-4-methyl-1-pentene rubber. Preferably, the thermoplastic elastomer (B) may be an ethylene-1-butene rubber (EBR), an ethylene-1-octene rubber (EOR), or a mixture thereof. Most preferably, the thermoplastic elastomer (B) is an ethylene-1-butene rubber (EBR).

The thermoplastic elastomer (B) may have a melt index of 0.2 to 10 g/10 minutes and an intrinsic viscosity of 0.5 to 2 ㎗/g when measured with a load of 2.16 kg at 190° C. according to ISO 1133.

The thermoplastic elastomer (B) may have an average size of 3 μm or less in the dispersed phase in the propylene homopolymer or ethylene-propylene random copolymer matrix.

The styrene-based block copolymer (C) is a styrene-butadiene-styrene block copolymer, a styrene-isoprene-styrene block copolymer, a styrene-ethylene-butylene-styrene block copolymer, a styrene-ethylene-propylene-styrene block copolymer, and It may be at least one selected from the group consisting of styrene-butadiene-butylene-styrene block copolymers. Preferably, the styrenic block copolymer (C) may be a styrene-ethylene-butylene-styrene copolymer (SEBS).

The styrenic block copolymer (C) may have an average size of 3 μm or less in the dispersed phase in the propylene homopolymer or ethylene-propylene random copolymer matrix.

The fine inorganic filler (D) may be at least one selected from the group consisting of talc, mica, calcium carbonate, wollastonite, barium sulfate, clay, and magnesium sulfate. As the fine inorganic filler (D), talc is most preferred.

Polyolefin wax (E) includes low density polyethylene wax, ethylene-α-olefin copolymer wax, high density polyethylene wax, polypropylene wax, ethylene-propylene copolymer wax, poly(4-methylpentene-1) wax, poly(butene- 1) It may be at least one selected from the group consisting of wax and ethylene-vinyl acetate wax. Preferably, the polyolefin-based wax (E) may be a low-density polyethylene wax.

According to another embodiment of the present invention, a polypropylene resin molded article manufactured by molding the above polypropylene resin composition is provided.

Specifically, the polypropylene resin molded article may be selected from the group consisting of automobile interior and exterior parts, electronic and home appliance parts, and construction and industrial materials.

The polypropylene resin composition according to an embodiment of the present invention has excellent mechanical properties such as impact resistance and stiffness, and plating properties, and the molded articles manufactured therefrom are automotive interior and exterior parts, electronic and home appliance parts, construction and industrial materials. It can be used effectively on the back.

1A to 1H are photographs of cross-sections of specimens prepared in Examples 1 to 2 and Comparative Examples 1 to 6, respectively, observed with a scanning electron microscope (SEM).

Hereinafter, the present invention will be described in more detail.

Polypropylene resin composition according to an embodiment of the present invention, based on the total weight of the components (A) to (D), (A) 40 to 70% by weight of a propylene block copolymer resin; (B) 5 to 20% by weight of thermoplastic elastomer; (C) 5 to 20% by weight of a styrenic block copolymer; And (D) 5 to 30 wt% of a fine inorganic filler having an average diameter in the range of 0.5 to 1 µm, and based on 100 parts by weight of components (A) to (D), (E) 0.01 to 1 weight of polyolefin wax %; And (F) 0.01 to 1% by weight of calcium stearate.

(A) Propylene block copolymer resin

The polypropylene resin composition according to an embodiment of the present invention includes a propylene block copolymer resin (A).

Specifically, the propylene block copolymer resin (A) may be obtained by stepwise polymerization of a propylene homopolymer or an ethylene-propylene random copolymer and a propylene-α-olefin rubber copolymer in a reactor. Here, the α-olefin in the propylene-α-olefin rubber copolymer may be at least one selected from the group consisting of ethylene, 1-butene, 1-hexene and 4-methyl-1-pentene. Of these, ethylene is most preferred.

Preferably, the content of the solvent extract (xylene soluble) in the propylene block copolymer resin (A) may be 10 to 30% by weight. When the content of the solvent extract in the propylene block copolymer resin (A) is within this range, the properties inherent to the propylene block copolymer can be sufficiently exhibited.

Preferably, the propylene block copolymer resin (A) may have a melt index of 10 to 100 g/10 minutes when measured at 230° C. with a load of 2.16 kg according to ISO 1133. More preferably, the propylene block copolymer resin (A) may have a melt index of 20 to 80 g/10 minutes or 30 to 60 g/10 minutes when measured at 230°C with a load of 2.16 kg.

When the melt index of the propylene block copolymer resin (A) is within the above range, the flowability of the resin composition is improved during molding, and a molded article having an excellent appearance can be manufactured. However, if the melt index exceeds the upper limit of the above range, the mechanical properties of the molded product may deteriorate.

The propylene block copolymer resin (A) may have a polydispersity index (PI) of 2.5 to 6.5. The polydispersity index of a resin is a measure of the molecular weight distribution as the cross-over point of the rheological properties G'(loss modulus) and G" storage modulus.. The polydispersity index of the propylene block copolymer resin (A) If it is within the above range, it is possible to prevent the problem of poor processability during molding of the resin composition due to the inorganic filler component.

The polypropylene resin composition according to an embodiment of the present invention contains a propylene block copolymer resin (A) in an amount of 40 to 70% by weight, based on the total weight of components (A) to (D). If the content of the propylene block copolymer resin (A) is less than 40% by weight, the inherent properties of the polypropylene are deteriorated and the functionality of the composition as a whole is deteriorated. In particular, the molding is not easy, making it difficult to manufacture a molded article. On the other hand, if the content of the propylene block copolymer resin (A) exceeds 70%, impact resistance and plating properties of the molded article may be deteriorated.

(B) thermoplastic elastomer

The polypropylene resin composition according to an embodiment of the present invention includes a thermoplastic elastomer (B).

The thermoplastic elastomer (B) serves to make a molded article molded from a resin composition have flexibility and improve physical properties such as low temperature impact strength. In particular, the thermoplastic elastomer (B) serves to improve the plating properties of the molded article.

At this time, the thermoplastic elastomer (B) may be a rubber in which ethylene and an α-olefin having 4 to 8 carbon atoms are copolymerized. Specifically, the thermoplastic elastomer (B) is ethylene-1-butene rubber, ethylene-butylene rubber, ethylene-1-pentene rubber, ethylene-1-hexene rubber, ethylene-1-heptene rubber, ethylene-1-octene rubber, and It may be at least one member selected from the group consisting of ethylene-4-methyl-1-pentene rubber. Preferably, the thermoplastic elastomer (B) may be an ethylene-1-butene rubber (EBR), an ethylene-1-octene rubber (EOR), or a mixture thereof. Most preferably, the thermoplastic elastomer (B) may be an ethylene-1-butene rubber (EBR).

The thermoplastic elastomer (B) may have an intrinsic viscosity of 0.5 to 2 ㎗/g measured according to ASTM D1795. Preferably, the intrinsic viscosity of the thermoplastic elastomer (B) may be 0.5 to 1.5 ㎗/g or 0.8 to 1.5 ㎗/g. When the intrinsic viscosity of the thermoplastic elastomer (B) is within this range, it is excellent in dispersibility in the polypropylene resin composition, and the plating properties of the molded article can be improved.

The thermoplastic elastomer (B) may have a melt index of 0.2 to 10 g/10 minutes when measured with a load of 2.16 kg at 190° C. according to ISO 1133. Preferably, the melt index of the thermoplastic elastomer (B) may be 1 to 10 g/10 minutes or 2 to 6 g/10 minutes. If the melt index of the thermoplastic elastomer (B) is too low, molding defects or appearance defects such as flow marks may occur, and if the melt index is too high, mechanical properties such as impact strength of the molded product may be deteriorated.

The thermoplastic elastomer (B) may have an average size of 3 μm or less in the dispersed phase in the propylene homopolymer or ethylene-propylene random copolymer matrix. When the size of the thermoplastic elastomer (B) in the dispersed phase in the matrix satisfies the above range, the molded article may have excellent plating properties due to excellent dispersibility in the polypropylene resin composition.

The polypropylene resin composition according to an embodiment of the present invention contains a thermoplastic elastomer (B) in an amount of 5 to 20% by weight, based on the total weight of the components (A) to (D). If the content of the thermoplastic elastomer (B) is less than 5% by weight, the impact strength and plating properties of the molded article may not be sufficient. On the other hand, if the content of the thermoplastic elastomer (B) exceeds 20% by weight, the stiffness of the molded article is poor, which is not preferable.

(C) Styrene-based block copolymer

The polypropylene resin composition according to an embodiment of the present invention includes a styrenic block copolymer (C).

The styrenic block copolymer (C) serves to make a molded article molded from a resin composition have flexibility similar to that of the thermoplastic elastomer (B) and to improve physical properties such as low temperature impact strength. In particular, the styrenge block copolymer (C) interacts with the thermoplastic elastomer (B) to improve dispersibility, thereby further enhancing the plating properties of the molded article.

The styrenic block copolymer (C) is an elastomer in which styrene and diene are copolymerized. Specifically, the styrene-based block copolymer (C) is a styrene-butadiene-styrene block copolymer, a styrene-isoprene-styrene block copolymer, a styrene-ethylene-butylene-styrene block copolymer, a styrene-ethylene-propylene-styrene block. It may be at least one selected from the group consisting of a copolymer and a styrene-butadiene-butylene-styrene block copolymer. Preferably, the styrenic block copolymer (C) may be a styrene-ethylene-butylene-styrene copolymer (SEBS).

In this case, the content of styrene and ethylene/butylene in the styrene-ethylene-butylene-styrene copolymer (SEBS) may be 10 to 20% by weight and 80 to 90% by weight, respectively.

The styrenic block copolymer (C) may have an average size of 3 μm or less in the dispersed phase in the propylene homopolymer or ethylene-propylene random copolymer matrix. When the size of the styrenic block copolymer (C) in the dispersed phase in the matrix satisfies the above range, the dispersibility in the polypropylene resin composition is excellent, so that the molded article may have excellent plating properties.

The polypropylene resin composition according to an embodiment of the present invention includes a styrenic block copolymer (C) in an amount of 5 to 20% by weight, based on the total weight of the components (A) to (D). If the content of the styrenic block copolymer (C) is less than 5% by weight, the impact strength and plating properties of the molded article may not be sufficient. On the other hand, when the content of the styrenic block copolymer (C) exceeds 20% by weight, the interaction with the thermoplastic elastomer (B) occurs excessively, and the rubber component is aggregated to prevent sufficient dispersion, which is not preferable.

(D) fine inorganic filler

The polypropylene resin composition according to an embodiment of the present invention includes a fine inorganic filler (D).

At this time, the fine inorganic filler (D) has an average diameter in the range of 0.5 to 1 μm. In the polypropylene resin composition according to an embodiment of the present invention, the fine inorganic filler (D) serves to reinforce the rigidity of the resin composition.

Specifically, the fine inorganic filler (D) may be at least one selected from the group consisting of talc, mica, calcium carbonate, wollastonite, barium sulfate, clay, and magnesium sulfate. As the fine inorganic filler (D), talc is most preferred.

The polypropylene resin composition according to an embodiment of the present invention includes a fine inorganic filler (D) in an amount of 5 to 30% by weight, based on the total weight of the components (A) to (D). If the content of the inorganic filler (D) is less than 5% by weight, the improvement in rigidity of the resin composition may not be sufficient. On the other hand, if the content of the fine inorganic filler (C) exceeds 30% by weight, the impact strength of the molded article may decrease, which may be undesirable.

(E) Polyolefin wax

The polypropylene resin composition according to an embodiment of the present invention includes a polyolefin-based wax (E).

Polyolefin wax (E) is a processing aid of the thermoplastic elastomer (B) and the styrenic block copolymer (C) in the polypropylene resin composition, and serves to enhance the dispersibility and improve the plating properties of the molded article.

Specifically, the polyolefin wax (E) is a polypropylene resin wax such as a low density polyethylene wax, an ethylene-α-olefin copolymer wax, a polyethylene resin wax such as a high density polyethylene wax, a polypropylene wax, and an ethylene-propylene copolymer wax. , Poly(4-methylpentene-1) wax, poly(butene-1) wax, and ethylene-vinyl acetate copolymer wax may be at least one selected from the group. Preferably, the polyolefin-based wax (E) may be a polyethylene-based resin wax, more preferably a low-density polyethylene wax.

The polypropylene resin composition according to an embodiment of the present invention further includes a polyolefin-based wax (E) in an amount of 0.01 to 1% by weight, based on 100 parts by weight of components (A) to (D). When the content of the polyolefin-based wax (E) exceeds 1 part by weight, excessive lubrication may occur, and the efficiency and economy of the product may be lowered, which is not preferable.

(F) calcium stearate

The polypropylene resin composition according to an embodiment of the present invention includes calcium stearate (F).

Calcium stearate (F) increases the dispersibility of the thermoplastic elastomer (B) and the styrenic block copolymer (C) in the polypropylene resin composition and improves the plating properties of the molded article.

The polypropylene resin composition according to an embodiment of the present invention further includes calcium stearate (F) in an amount of 0.01 to 1% by weight, based on 100 parts by weight of components (A) to (D). When the content of calcium stearate (F) exceeds 1 part by weight, calcium stearate may be eluted or the economic efficiency of the product may be lowered, which is not preferable.

The polypropylene resin composition according to an embodiment of the present invention may further include an additive (G) in an amount of 3 parts by weight or less based on 100 parts by weight of components (A) to (D). At this time, the additive (G) may be at least one selected from the group consisting of a heat-resistant stabilizer, a neutralizing agent, a reinforcing material, a filler, a weather stabilizer, an antistatic agent, a lubricant, a slip agent, a pigment, and a dye, but is not particularly limited thereto. .

There is no particular limitation on the method of preparing the polypropylene resin composition according to the specific embodiment of the present invention, and the method for preparing the polypropylene resin composition known in the art may be used as it is or appropriately modified, and each The resin components can be freely selected and mixed according to the desired order without any particular order limitation. Specifically, for example, each of the resins and additives mentioned above are added to a kneader such as a kneader, roll, or Banbury mixer or a single-screw or twin-screw extruder in the required amount. The polypropylene resin composition of the present invention can be prepared by a method of blending the input raw materials using devices.

As a specific example, each of the resins and additives mentioned above are melt-blended at a temperature of 180 to 280°C in a twin screw extruder to form pellets.

According to another embodiment of the present invention, there is provided a polypropylene resin molded article manufactured by molding the polypropylene resin composition of the present invention.

There is no particular limitation on a method of manufacturing a molded article from the polypropylene resin composition according to an embodiment of the present invention, and a method known in the art may be used. For example, a polypropylene resin molded article may be manufactured by molding the polypropylene resin composition according to an embodiment of the present invention by conventional methods such as injection molding, extrusion molding, and casting molding.

The polypropylene resin molded article according to the embodiment of the present invention has excellent mechanical properties and plating properties, and thus can be applied as a plastic product requiring plating. For example, this molded article can be used as interior and exterior parts of automobiles, parts of electronic and home appliances, and construction and industrial materials.

Example

Hereinafter, the present invention will be described in more detail through Examples and Comparative Examples. However, the following examples are only for illustrating the present invention, and the scope of the present invention is not limited thereto.

In Examples and Comparative Examples, the following resins and compounds were used in the amounts (unit: parts by weight) shown in Table 1.

A1: Ethylene-propylene block copolymer (melting index 30 g/10 min, polydispersity index 3.7)

A2: Ethylene-propylene block copolymer (melting index 60 g/10 min, polydispersity index 5.9)

A3: Ethylene-propylene block copolymer (melting index 100 g/10 min, polydispersity index 2.8)

B1: Ethylene-1-octene rubber (intrinsic viscosity 1.43 ㎗/g, melt index 2 g/10 min, density 0.857 g/cm 3)

B2: Ethylene-1-butene rubber (intrinsic viscosity 1.1 dl/g, melt index 7.2 g/10 min, density 0.864 g/cm 3)

B3: Ethylene-1-butene rubber (intrinsic viscosity 1.59 dl/g, melt index 1 g/10 min, density 0.861 g/cm 3)

C1: Styrene-ethylene/butene-styrene rubber (melting index 4.5 g/10 min, density 0.89 g/cm 3, styrene to ethylene-butylene ratio 18/82)

D1: Circular talc (diameter 5-10 μm, aspect ratio 1-3, specific gravity 2.7)

D2: Round talc (diameter 0.5-1 μm, aspect ratio 1-3, specific gravity 2.8)

E1: Low-density polyethylene wax (density 0.92 g/cm3, molecular weight 1,000-3,000 g/mole, crystallinity 50-60%)

F1: Calcium stearate (density 1.03 g/cm 3, melting point 145 to 160°C)

Example Comparative example One 2 One 2 3 4 5 6 A1 20 - - 30 - 30 20 - A2 40 23 40 35 30 35 45 35 A3 - 37 25 - 35 - - 30 B1 - - 15 - - - - - B2 12 - - 15 - 15 10 - B3 - 12 - - 15 - - 10 C1 8 8 - - - - 5 5 D1 - - 20 20 20 20 20 20 D2 20 20 - - - - - - E1 0.3 0.3 - - - 0.2 0.2 0.2 F1 0.5 0.5 - - - - 0.5 0.5

Test example

After melt-blending resins and additives of the content (unit: parts by weight) as shown in Table 1 above at a temperature of 200°C in a twin screw extruder to pelletize, use an injection molding machine to achieve ISO standards at a temperature of 190 to 245°C. It was molded into a specimen.

The properties of the compositions and specimens obtained in each Example and Comparative Example were measured by the following method.

(1) Melt Index

It was measured according to ISO 1133 at 230° C. with a load of 2.16 kg.

(2) Tensile strength and elongation

It was measured under conditions of 50 mm/min according to ISO 527.

(3) Flexural modulus

It was measured under 10 mm/min conditions according to ISO 178.

(4) IZOD impact strength

It was measured at room temperature under the condition of 45±1°, rN = 0.25±0.05 mm notched according to ISO 180.

(5) Heat deflection temperature (HDT)

It was measured under 0.45 MPa conditions according to ISO 75.

(6) Shrinkage (MD)

It was measured according to ASTM D955 standard.

(7) Dispersibility (plating property)

The center of the plate specimen was cut and the cross section was observed with a scanning electron microscope (SEM). The degree of dispersion of the rubber component was evaluated according to the following criteria: Very good: ◎, good: ○, normal: △, poor: ×, very poor: × ×. If the degree of dispersion was good or higher, it was judged that the plating property was excellent.

Example Comparative example One 2 One 2 3 4 5 6 Melt index
(g/10min) 28.1 31.3 25.3 27.5 28.7 30.5 28.1 29.8 Tensile strength (MPa) 21 21 22 23 22 21 23 21 Elongation(%) 121 103 89 105 85 115 110 115 Flexural modulus (MPa) 1,916 1,850 1,950 2,036 1,973 1,915 2,054 1,901 IZOD impact strength (kJ/m ² ) 41 45 27 33 29 28 32 30 Heat deflection temperature (℃) 110 110 108 105 112 110 106 110 Shrinkage (%) 6.4 6.2 7.0 7.2 7.0 6.9 7.2 6.7 Dispersibility ◎ ◎ ×× × × △ ○ ○

As can be seen from Tables 1 and 2 above, in the case of the polypropylene resin composition of the Examples falling within the scope of the present invention, both mechanical properties and dispersibility (plating properties) were excellent.

On the other hand, in the case of Comparative Examples 1 to 3 using a conventional inorganic filler instead of the fine inorganic filler, the dispersibility was not good.

On the other hand, in the case of Comparative Example 4 using a polyolefin-based wax together with a conventional inorganic filler, the dispersibility was improved compared to Comparative Example 2, respectively, but not sufficiently improved compared to the Example.

In addition, in the case of Comparative Examples 5 and 6 using a styrene-based block copolymer and a conventional inorganic filler, polyolefin-based wax, and calcium stearate, the dispersibility was significantly improved compared to Comparative Examples 2 and 3, but was applied to actual plated specimens. In the following, the dispersibility and impact strength were not good compared to the examples.

Therefore, the polypropylene resin composition according to an embodiment that falls within the scope of the present invention is excellent in both mechanical properties (balance of flexural modulus and IZOD impact strength, etc.) and plating properties, and thus molded articles manufactured therefrom are automotive interior and exterior parts, It can be effectively used for electronic and home appliance parts, construction and industrial materials.

Claims (22)

Based on the total weight of components (A) to (D), (A) 40 to 70% by weight of a propylene block copolymer resin; (B) 5 to 20% by weight of thermoplastic elastomer; (C) 5 to 20% by weight of a styrenic block copolymer; And (D) 5 to 30 wt% of a fine inorganic filler having an average diameter in the range of 0.5 to 1 µm, and based on 100 parts by weight of components (A) to (D), (E) 0.01 to 1 weight of polyolefin wax %; And (F) 0.01 to 1% by weight of calcium stearate, wherein the propylene block copolymer resin (A) is a propylene homopolymer or an ethylene-propylene random copolymer and a propylene-α-olefin rubber copolymer are stepwise in the reactor. The propylene block copolymer resin (A) has a polydispersity (PI) of 2.5 to 6.5, and the thermoplastic elastomer (B) is 0.2 when measured with a load of 2.16 kg at 190°C according to ISO 1133. It has a melt index of ~10 g/10 min and an intrinsic viscosity of 0.5 ~ 2 ㎗/g, and the thermoplastic elastomer (B) has an average size of 3 µm or less in a dispersed phase in a propylene homopolymer or ethylene-propylene random copolymer matrix , A polypropylene resin composition wherein the styrene block copolymer (C) has an average size of 3 μm or less in a dispersed phase in a propylene homopolymer or ethylene-propylene random copolymer matrix. delete The polypropylene resin composition according to claim 1, wherein the α-olefin in the propylene-α-olefin rubber copolymer is at least one selected from the group consisting of ethylene, 1-butene, 1-hexene and 4-methyl-1-pentene. . The polypropylene resin composition according to claim 3, wherein the α-olefin in the propylene-α-olefin rubber copolymer is ethylene. The polypropylene resin composition according to claim 1, wherein the content of the solvent extract (xylene soluble) in the propylene block copolymer resin (A) is 10 to 30% by weight. The polypropylene resin composition according to claim 1, wherein the propylene block copolymer resin (A) has a melt index of 10 to 100 g/10 minutes when measured at 230° C. with a load of 2.16 kg according to ISO 1133. delete The polypropylene resin composition according to claim 1, wherein the thermoplastic elastomer (B) is a rubber in which ethylene and an α-olefin having 4 to 8 carbon atoms are copolymerized. The method according to claim 8, wherein the thermoplastic elastomer (B) is ethylene-1-butene rubber, ethylene-butylene rubber, ethylene-1-pentene rubber, ethylene-1-hexene rubber, ethylene-1-heptene rubber, ethylene-1- At least one polypropylene resin composition selected from the group consisting of octene rubber and ethylene-4-methyl-1-pentene rubber. The polypropylene resin composition according to claim 9, wherein the thermoplastic elastomer (B) is an ethylene-1-butene rubber (EBR), an ethylene-1-octene rubber (EOR), or a mixture thereof. The polypropylene resin composition according to claim 10, wherein the thermoplastic elastomer (B) is ethylene-1-butene rubber (EBR). delete delete The method of claim 1, wherein the styrene block copolymer (C) is a styrene-butadiene-styrene block copolymer, a styrene-isoprene-styrene block copolymer, styrene-ethylene-butylene-styrene block copolymer, styrene-ethylene-propylene- At least one polypropylene resin composition selected from the group consisting of a styrene block copolymer and a styrene-butadiene-butylene-styrene block copolymer. The polypropylene resin composition according to claim 14, wherein the styrene block copolymer (C) is a styrene-ethylene-butylene-styrene copolymer (SEBS). delete The polypropylene resin composition according to claim 1, wherein the fine inorganic filler (D) is at least one selected from the group consisting of talc, mica, calcium carbonate, wollastonite, barium sulfate, clay, and magnesium sulfate. The polypropylene resin composition according to claim 17, wherein the fine inorganic filler (D) is talc. The method of claim 1, wherein the polyolefin wax (E) is a low density polyethylene wax, an ethylene-α-olefin copolymer wax, a high density polyethylene wax, a polypropylene wax, an ethylene-propylene copolymer wax, and a poly(4-methylpentene-1). At least one polypropylene resin composition selected from the group consisting of wax, poly(butene-1) wax, and ethylene-vinyl acetate wax. The polypropylene resin composition according to claim 1, wherein the polyolefin wax (E) is a low density polyethylene wax. Any one of claims 1, 3 to 6, 8 to 11, 14, 15, and 17 to 20, prepared by molding the polypropylene resin composition according to any one of the Polypropylene resin molded product. 22. The polypropylene resin molded article according to claim 21, wherein the article is selected from the group consisting of automobile interior and exterior parts, electronic and home appliance parts, and construction materials.

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