KR20230052439A - Polypropylene Resin Composition with Fiber Texture and Article Molded Therefrom - Google Patents

Abstract

The present invention relates to a polypropylene resin composition having a fiber texture and a molded article manufactured therefrom. The polypropylene resin composition according to an embodiment of the present invention can be applied to a variety of colors and has improved fiber texture development while having excellent moldability and impact resistance. Therefore, molded articles manufactured therefrom can be effectively used for automobile interior and exterior parts, electronic and home appliance parts, construction and industrial materials, etc. To this end, provided is a polypropylene resin composition comprising, based on the total weight of components (A) to (E), 30 to 80 wt% of polypropylene resin (A); 5 to 30 wt% of a thermoplastic elastomer (B); 5 to 30 wt% of an inorganic filler (C); 0.1 to 4 wt% of plastic flakes (D); and 0.01 to 2 wt% of carbon fiber (E).

Description

Polypropylene Resin Composition with Fiber Texture and Article Molded Therefrom}

The present invention relates to a polypropylene resin composition having a fiber texture and a molded article manufactured therefrom. Specifically, the present invention relates to a polypropylene resin composition having improved expression of fiber texture according to color and excellent moldability and impact resistance, and a molded product manufactured therefrom.

Polypropylene resin, a type of general-purpose resin, has excellent mechanical properties, moldability, and chemical resistance as well as economic feasibility, and is used for interior and exterior parts of automobiles, parts of electrical and home appliances, building and industrial materials, films, pipes, and wires. is widely used as

Specifically, attempts have been made to use molded articles manufactured by injection molding a polypropylene resin as parts of automobiles or electronic products. In this case, the fuel efficiency of the vehicle may be improved due to the weight reduction of the parts. In addition, since the polypropylene resin is inexpensive compared to other resins, not only can the manufacturing cost be lowered, but also has the advantage of being easy to recycle.

In accordance with the recent trend of high-end automobiles, there is an increasing demand for high-quality automotive interior materials such as door trims, pillar trims, and crash pads. In order to realize high-quality automotive interior materials, in the past, fabrics were often joined during interior molding or adhesives were used to bond the fabric after molding. However, the production process is complicated and problems with VOC (volatile organic compounds) caused by adhesives may can

In order to improve these problems, attempts have been made to add additives capable of creating fiber texture to a polypropylene resin composition including a polypropylene resin, an elastomer such as ethylene-α-olefin rubber, and an inorganic filler such as talc. Here, cellulose fibers and volcanic stone were mainly used as additives capable of producing fiber texture (see Korean Patent No. 10-1476057).

However, there is a demand for the development of a polypropylene resin composition that can be applied to various colors and has improved expression of fiber texture while having excellent moldability and impact resistance.

Korean Patent No. 10-1476057

Accordingly, an object of the present invention is to provide a polypropylene resin composition having excellent moldability and impact resistance while being applicable to various colors and having an ability to develop improved fiber texture.

Another object of the present invention is to provide a molded article prepared from the above polypropylene resin composition.

According to one embodiment of the present invention for achieving the above object, based on the total weight of components (A) to (E), (A) 30 to 80% by weight of a polypropylene resin; (B) 5 to 30% by weight of a thermoplastic elastomer; (C) 5 to 30% by weight of an inorganic filler; (D) 0.1 to 4% by weight of plastic flakes; and (E) 0.01 to 2% by weight of carbon fibers.

In a specific embodiment of the present invention, the polypropylene resin (A) is a propylene-α-olefin block copolymer obtained by stepwise polymerization of a propylene homopolymer or an ethylene-propylene random copolymer and a propylene-α-olefin rubber copolymer in a reactor. can be

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. Among these, ethylene is most preferred.

In an embodiment of the present invention, the content of the solvent extract (xylene soluble) in the propylene-α-olefin copolymer resin may be 10 to 30% by weight.

In an embodiment of the present invention, the polypropylene resin (A) may have a melt index of 1 to 100 g/10 min when measured at 230° C. under a load of 2.16 kg according to ISO 1133.

In an embodiment of the present invention, the thermoplastic elastomer (B) may be a copolymer rubber of ethylene and an α-olefin having 4 to 8 carbon atoms. More 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 ethylene-4-methyl-1-pentene rubber. Preferably, the thermoplastic elastomer (B) may be ethylene-1-octene rubber (EOR).

In an embodiment of the present invention, the thermoplastic elastomer (B) may have a melt index of 0.2 to 10 g/10 min and an intrinsic viscosity of 0.5 to 2 dl/g when measured at 190° C. under a load of 2.16 kg according to ISO 1133. .

In an embodiment of the present invention, the inorganic filler (C) is at least one selected from the group consisting of talc, mica, calcium carbonate, wollastonite, barium sulfate, clay, magnesium sulfate, whisker, and glass fiber, and has an average particle diameter It may be 10 μm or less.

In an embodiment of the present invention, the plastic flake (D) is a polyethylene terephthalate material, and may have an average length of 0.01 to 2.5 mm along its long axis.

In an embodiment of the present invention, the carbon fibers (E) may have an average diameter of 5 to 30 μm and an average length of 0.5 to 2.5 mm.

In an embodiment of the present invention, the polypropylene resin composition is a compatibilizer, antioxidant, neutralizer, slip agent, antiblocking agent, reinforcing agent, filler, weathering stabilizer, light stabilizer, release agent, antistatic agent, lubricant, nucleating agent, flame retardant, pigment and dye It may further include at least one additive selected from the group consisting of.

In an embodiment of the present invention, the polypropylene resin composition may further include a compatibilizer in an amount of 1 part by weight or less based on 100 parts by weight of components (A) to (E), and the compatibilizer is styrene- It may be an olefin-based rubber. Specifically, the compatibilizing agent is at least selected from the group consisting of styrene-ethylene-butadiene-styrene rubber, styrene-ethylene-propylene-styrene rubber, styrene-ethylene-propylene rubber, styrene-butadiene-styrene rubber and styrene-butadiene rubber. It can be 1 day.

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

In an embodiment of the present invention, the polypropylene resin molded article may be selected from the group consisting of automobile interior and exterior parts, electronic and household appliance parts, building and industrial materials. More specifically, the polypropylene resin molded article may be an automobile interior material selected from the group consisting of door trims, pillar trims, and crash pads.

The polypropylene resin composition according to an embodiment of the present invention is applicable to various colors and has an ability to develop an improved fiber texture, while having excellent moldability and impact resistance. Therefore, molded articles manufactured therefrom can be effectively used for interior and exterior parts of automobiles, parts of electronic and household appliances, building and industrial materials, and the like.

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

According to one embodiment of the present invention, based on the total weight of components (A) to (E), (A) 30 to 80% by weight of polypropylene resin; (B) 5 to 30% by weight of a thermoplastic elastomer; (C) 5 to 30% by weight of an inorganic filler; (D) 0.1 to 4% by weight of plastic flakes; and (E) 0.01 to 2% by weight of carbon fibers.

(A) polypropylene resin

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

In an embodiment of the present invention, the polypropylene resin (A) may be a propylene-α-olefin block copolymer.

More specifically, the propylene-α-olefin block copolymer 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. Among these, ethylene is most preferred.

In an embodiment of the present invention, the content of the solvent extract (xylene soluble) in the propylene-α-olefin copolymer resin may be 10 to 30% by weight. When the content of the solvent extract in the propylene-α-olefin copolymer resin is within this range, the inherent properties of the propylene-α-olefin copolymer resin can be fully exhibited.

In an embodiment of the present invention, the polypropylene resin (A) may have a melt index of 1 to 100 g/10 min when measured at 230° C. under a load of 2.16 kg according to ISO 1133. Preferably, the polypropylene resin (A) may have a melt index of 20 to 80 g/10 min or 30 to 60 g/10 min when measured under a load of 2.16 kg at 230° C. according to ISO 1133.

When the melt index of the polypropylene resin (A) is within the above range, the flowability of the resin composition is improved during molding and it is possible to manufacture molded articles having excellent appearance. When the melt index exceeds the upper limit of the above range, the mechanical properties of the molded product may deteriorate, and when the melt index is less than 1 g/10 min, molding may be difficult.

The polypropylene resin composition according to an embodiment of the present invention includes the polypropylene resin (A) in an amount of 30 to 80% by weight based on the total weight of components (A) to (E). If the content of the polypropylene resin (A) is less than 30% by weight, the inherent properties of polypropylene are deteriorated, resulting in a decrease in the functionality of the entire composition, and in particular, it is not easy to manufacture a molded article because it is not easy to mold. On the other hand, if the content of the polypropylene resin (A) exceeds 80%, the impact resistance and fiber texture of the molded article may be deteriorated.

(B) thermoplastic elastomer

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

The thermoplastic elastomer (B) serves to improve physical properties such as low-temperature impact strength and to have flexibility in a molded product molded from a resin composition.

In an embodiment of the present invention, the thermoplastic elastomer (B) may be a copolymer rubber of ethylene and an α-olefin having 4 to 8 carbon atoms. 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 selected from the group consisting of ethylene-4-methyl-1-pentene rubber. Preferably, the thermoplastic elastomer (B) may be ethylene-1-butene rubber (EBR), ethylene-1-octene rubber (EOR) or a mixture thereof. Most preferably, the thermoplastic elastomer (B) may be ethylene-1-octene rubber (EOR).

In an embodiment of the present invention, the thermoplastic elastomer (B) may have a melt index of 0.2 to 10 g/10 min when measured at 190° C. under a load of 2.16 kg according to ISO 1133. Preferably, the melt index of the thermoplastic elastomer (B) may be 1 to 10 g/10 min or 2 to 6 g/10 min. 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 of the thermoplastic elastomer (B) is too high, mechanical properties such as impact strength of molded products may deteriorate. may be lowered

In an embodiment of the present invention, the thermoplastic elastomer (B) may have an intrinsic viscosity of 0.5 to 2 dl/g. Preferably, the intrinsic viscosity of the thermoplastic elastomer (B) may be 0.5 to 1.5 dl/g or 0.8 to 1.5 dl/g. When the intrinsic viscosity of the thermoplastic elastomer (B) is within this range, it is excellent in dispersibility in the polypropylene resin composition, so that physical properties of molded articles such as low-temperature impact strength can be improved.

The polypropylene resin composition according to an embodiment of the present invention includes the thermoplastic elastomer (B) in an amount of 5 to 30% by weight based on the total weight of components (A) to (E). If the content of the thermoplastic elastomer (B) is less than 5% by weight, the impact resistance of the molded article may not be sufficient. On the other hand, if the content of the thermoplastic elastomer (B) exceeds 30% by weight, the rigidity of the molded product is undesirably lowered.

(C) inorganic filler

The polypropylene resin composition according to one embodiment of the present invention includes an inorganic filler (C).

In the polypropylene resin composition according to one embodiment of the present invention, the inorganic filler (C) serves to reinforce the rigidity of the resin composition.

In an embodiment of the present invention, the inorganic filler (C) may be at least one selected from the group consisting of talc, mica, calcium carbonate, wollastonite, barium sulfate, clay, magnesium sulfate, whisker, and glass fiber, but these is not particularly limited to. Preferably, the inorganic filler (D) may be talc.

In an embodiment of the present invention, the inorganic filler (C) may have an average particle diameter of 10 μm or less. When the particle size of the inorganic filler (C) is within this range, the dispersibility in the resin composition is excellent, and the rigidity of the molded article can be improved.

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

(D) plastic flakes

A polypropylene resin composition according to an embodiment of the present invention includes plastic flakes (D).

In the polypropylene resin composition according to one embodiment of the present invention, the plastic flake (D) serves to improve the fiber texture of the resin composition in various colors.

In an embodiment of the present invention, the plastic flake (D) may be made of a polyester material, preferably a polyethylene terephthalate (PET) material.

Plastic flakes (D) are prepared by washing and pulverizing a container made of polyester material recovered after use, specifically, a container made of polyethylene terephthalate, removing impurities such as films included in the pulverized product, and dehydrating and drying the flakes. It can be.

In an embodiment of the present invention, the average length of the long axis of the plastic flake (D) may be 0.01 to 2.5 mm. If the average length of the flakes is less than 0.01 mm, it is difficult to express the fiber texture, and if the average length of the flakes exceeds 2.5 mm, the flow of the resin composition may be hindered, resulting in poor appearance or deterioration of physical properties during production.

The polypropylene resin composition according to one embodiment of the present invention includes plastic flakes (D) in an amount of 0.1 to 4% by weight based on the total weight of components (A) to (E). If the flake content is less than 0.1% by weight, it is difficult to express the fiber texture, and if the flake content exceeds 4% by weight, the flow of the resin composition may be hindered, resulting in poor appearance or deterioration of physical properties during production.

(E) carbon fiber

A polypropylene resin composition according to an embodiment of the present invention includes carbon fibers (E).

In the polypropylene resin composition according to one embodiment of the present invention, the carbon fibers (E) serve to improve the fiber texture of the resin composition in various colors.

The specific type of the carbon fiber (E) is not particularly limited, as long as it is a fiber composed of molecular chains in which carbon atoms form a crystalline structure and form a long line.

In an embodiment of the present invention, the carbon fibers (E) may have an average diameter of 5 to 30 μm and an average length of 0.5 to 2.5 mm. In addition, the carbon fiber (E) may have an aspect ratio of 20 to 120. If the average length of the carbon fibers is less than 5 μm, it is difficult to express the fiber texture, and if the average length of the carbon fibers exceeds 30 μm, the flow of the resin composition may be hindered, resulting in poor appearance or deterioration of physical properties during production.

The polypropylene resin composition according to one embodiment of the present invention includes carbon fibers (E) in an amount of 0.01 to 2% by weight based on the total weight of components (A) to (E). If the carbon fiber content is less than 0.01% by weight, it is difficult to express the fiber texture, and if the carbon fiber content exceeds 2% by weight, the flow of the resin composition may be hindered, resulting in poor appearance or deterioration of physical properties during production.

additive

The polypropylene resin composition according to an embodiment of the present invention may further include conventional additives within a range not departing from the object of the present invention. For example, the polypropylene resin composition includes a compatibilizing agent, an antioxidant, a neutralizing agent, a slip agent, an antiblocking agent, a reinforcing agent, a filler, a weathering stabilizer, a light stabilizer, a release agent, an antistatic agent, a lubricant, a nucleating agent, a flame retardant, a pigment, and a dye. It can, but is not limited to these.

In an embodiment of the present invention, the polypropylene resin composition according to an embodiment of the present invention may further include a compatibilizer in an amount of 1 part by weight or less based on 100 parts by weight of components (A) to (E). there is.

The compatibilizer serves to improve compatibility between the polypropylene resin (A) and the plastic flake (D).

In an embodiment of the present invention, the compatibilizing agent may be a styrene-olefin based rubber. Specifically, the compatibilizing agent is at least selected from the group consisting of styrene-ethylene-butadiene-styrene rubber, styrene-ethylene-propylene-styrene rubber, styrene-ethylene-propylene rubber, styrene-butadiene-styrene rubber and styrene-butadiene rubber. It may be one kind, but is not particularly limited thereto. Preferably, the compatibilizer may be styrene-butadiene rubber.

There is no particular limitation on the method for preparing the polypropylene resin composition according to the embodiment of the present invention, and the method for preparing the polypropylene resin composition known in the art to which the present invention belongs may be used as it is or with appropriate modifications.

For example, after adding the necessary amounts of each component of the above-mentioned composition to a kneader, a roll, a kneader such as a Banbury mixer, or a single-screw / twin-screw extruder, use these devices The polypropylene resin composition of the present invention can be prepared by blending the input raw materials.

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

There is no particular limitation on the method for preparing a molded article from the polypropylene resin composition according to the embodiment of the present invention, and a method known in the art to which the present invention pertains 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 a conventional method such as injection molding, extrusion molding, or casting molding.

In an embodiment of the present invention, the polypropylene resin molded article may be selected from the group consisting of automobile interior and exterior parts, electronic and home appliance parts, building and industrial materials, but is not particularly limited thereto.

More specifically, the polypropylene resin molded article may be an automobile interior material selected from the group consisting of door trims, pillar trims, and crash pads.

Example

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

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

A1: crystalline ethylene-propylene block copolymer (melting index 60 g/10 min, solvent extract 10-15% by weight, BI871 from Hanwha Total)

B1: ethylene-1-octene rubber (intrinsic viscosity 1.43 dl/g, melt index 1 g/10 min, DOW ENGAGE8842)

C1: Circular talc (diameter 0.5-1 μm, aspect ratio 1-3, density 2.8 g/cm 3 , KOCH KC-5000)

D1: PET flakes with an average length of the long axis of 0.3 to 1.5 mm

E1: carbon fiber with an average diameter of 15 to 20 μm and an average length of 0.5 to 1.0 mm

F1: Cellulose fibers having an average length of 0.3 to 1 mm and an average diameter of 0.1 to 0.5 mm

F2: reddish-brown matsutake having an average particle size of 100 μm

Example comparative example One 2 3 One 2 3 4 5 6 7 A1 55 54.5 53.5 64.5 64 63.5 64.5 64 64 62 B1 23 23 23 15 15 15 15 15 15 15 C1 20 20 20 20 20 20 20 20 20 20 D1 1.5 2.0 3.0 - - - - 1.0 2.0 E1 1.0 0.5 0.5 - - - 1.0 2.0 - - F1 - - - 1.0 2.0 2.0 - - - - F2 - - - 1.0 - - - -

test example

Resins and additives of the contents (unit: parts by weight) as shown in Table 1 above are melt-blended and pelletized at a temperature of 200 ° C in a twin screw extruder, and then pelletized using an injection molding machine at a temperature of 190 ~ 245 ° C. It was molded into a specimen.

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

(1) melt index (MI; g/10 min)

Measurements were made at 230° C. according to ISO 1133 with a load of 2.16 kg.

(2) Flexural modulus (MPa)

It was measured under the condition of 10 mm/min according to ISO 178.

(3) IZOD impact strength (kJ/㎡)

According to ISO 180, it was measured at room temperature under conditions of 45±1° and rN = 0.25±0.05 mm notched.

(4) Textile texture

Injection molding was performed using an injection molding machine at a temperature of 190 to 245 ° C, and the FMVSS standard specimen was used as the flat specimen, and the corrosion specimen for interior materials of Hyundai Kia Motors (HL-225) was used as the corrosion specimen.

Flat specimens and corrosion specimens were measured by a visual evaluation method.

very good: ◎, good: ○; Normal: △, Poor: Х

Example comparative example One 2 3 One 2 3 4 5 6 7 MI 31 31.5 31.1 37 36.5 36.2 38.1 37.5 36.5 37.1 flexural modulus 1,815 1,804 1,735 2,050 1,930 1,865 2,110 2,055 2,095 2,037 Izod impact strength 42.5 42 38.5 25.5 23.1 21.5 27.5 25.1 27 26.7 textile texture
(beige) ◎ ◎ ◎ ○ ○ ◎ ○ ◎ △ ○ textile texture
(dark gray) ◎ ◎ ◎ Х Х Х Х Х △ ◎

As can be seen from Tables 1 and 2 above, in the case of the polypropylene resin compositions of Examples falling within the scope of the present invention, the ability to express fiber texture in both beige and dark gray was excellent, and compared to the case of Comparative Examples, the physical properties degradation was small.

On the other hand, in the case of Comparative Examples 1 to 3 using cellulose fiber and/or volcanic stone as a fiber texture developing additive, in beige, the fiber texture improved as the additive content increased, but the physical properties deteriorated. In addition, the fiber texture was not expressed in dark gray.

In the case of Comparative Examples 4 and 5 using only carbon fiber as a fiber texture developing additive, the fiber texture was not expressed in dark gray. In addition, in the case of Comparative Examples 6 and 7 using only plastic flakes as a fiber texture developing additive, the fiber texture was relatively poor in beige.

Therefore, the polypropylene resin composition according to the embodiment falling within the scope of the present invention is applicable to various colors and has improved fiber texture expression ability while having excellent moldability and impact resistance, so a molded article manufactured therefrom can be used in automobiles. ·It can be effectively used for exterior parts, electronic and home appliance parts, building and industrial materials, etc.

Claims (19)

Based on the total weight of components (A) to (E), (A) 30 to 80% by weight of polypropylene resin; (B) 5 to 30% by weight of a thermoplastic elastomer; (C) 5 to 30% by weight of an inorganic filler; (D) 0.1 to 4% by weight of plastic flakes; and (E) a polypropylene resin composition comprising 0.01 to 2% by weight of carbon fibers. The polypropylene resin according to claim 1, wherein the polypropylene resin (A) is a propylene-α-olefin block copolymer obtained by stepwise polymerization of a propylene homopolymer or an ethylene-propylene random copolymer and a propylene-α-olefin rubber copolymer in a reactor. Propylene resin composition. The polypropylene resin composition according to claim 2, 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 2, wherein the content of xylene soluble in the propylene-α-olefin block copolymer is 10 to 30% by weight. The polypropylene resin composition according to claim 1, wherein the polypropylene resin (A) has a melt index of 1 to 100 g/10 min when measured at 230° C. under a load of 2.16 kg according to ISO 1133. The polypropylene resin composition according to claim 1, wherein the thermoplastic elastomer (B) is a rubber copolymerized with ethylene and an α-olefin having 4 to 8 carbon atoms. The method of claim 7, 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- A polypropylene resin composition comprising at least one selected from the group consisting of octene rubber and ethylene-4-methyl-1-pentene rubber. The polypropylene resin composition according to claim 8, wherein the thermoplastic elastomer (B) is ethylene-1-octene rubber (EOR). The polypropylene resin according to claim 1, wherein the thermoplastic elastomer (B) has a melt index of 0.2 to 10 g/10 min and an intrinsic viscosity of 0.5 to 2 dl/g when measured at 190° C. under a load of 2.16 kg according to ISO 1133. composition. The method of claim 1, wherein the inorganic filler (C) is at least one selected from the group consisting of talc, mica, calcium carbonate, wollastonite, barium sulfate, clay, magnesium sulfate, whisker, and glass fiber, and has an average particle diameter of 10 μm or less, the polypropylene resin composition. The polypropylene resin composition according to claim 11, wherein the inorganic filler (C) is talc. The polypropylene resin composition according to claim 1, wherein the plastic flake (D) is made of polyethylene terephthalate and has an average length of 0.01 to 2.5 mm along its major axis. The polypropylene resin composition according to claim 1, wherein the carbon fibers (E) have an average diameter of 5 to 30 μm and an average length of 0.5 to 2.5 mm. The method according to claim 1, selected from the group consisting of a compatibilizer, an antioxidant, a neutralizer, a slip agent, an antiblocking agent, a reinforcing agent, a filler, a weathering stabilizer, a light stabilizer, a release agent, an antistatic agent, a lubricant, a nucleating agent, a flame retardant, a pigment, and a dye. A polypropylene resin composition further comprising at least one additive to be. The method of claim 15, based on 100 parts by weight of components (A) to (E), further comprises a compatibilizer in an amount of 1 part by weight or less, and the compatibilizer may be a styrene-olefin rubber. Specifically, the compatibilizing agent is at least selected from the group consisting of styrene-ethylene-butadiene-styrene rubber, styrene-ethylene-propylene-styrene rubber, styrene-ethylene-propylene rubber, styrene-butadiene-styrene rubber and styrene-butadiene rubber. One type of polypropylene resin composition. A polypropylene resin molded article manufactured by molding the polypropylene resin composition according to any one of claims 1 to 16. The polypropylene resin molded article according to claim 17, characterized in that it is selected from the group consisting of automotive interior and exterior parts, electronic and home appliance parts, and building materials. The polypropylene resin molded product according to claim 18, which is an automobile interior material selected from the group consisting of door trims, pillar trims and crash pads.