Eco-friendly composite resin composition and molded article manufactured therefrom

Abstract

The present invention relates to an eco-friendly composite resin composition and a molded article manufactured therefrom, and, more specifically, to an eco-friendly composite resin composition and a molded article manufactured therefrom, the composition comprising, together with polypropylene (PP) applied to automotive interior parts, biomass in an amount higher than that of a conventional composition, thereby satisfying, while implementing eco-friendliness, physical properties and reliability required for automotive interior parts.

Description

Eco-friendly composite resin composition and molded article manufactured thereby

[0001] The present invention relates to an eco-friendly composite resin composition and a molded article produced thereby. More specifically, it relates to an eco-friendly composite resin composition and a molded article produced thereby, which satisfies the physical properties and reliability required for automotive interior parts while achieving eco-friendliness by including biomass in a higher content than conventional methods together with polypropylene (PP) applied to automotive interior parts.

[0002]

[0003] With the recent rise in interest in environmental issues, the use of eco-friendly materials is increasing in the automotive industry. In particular, there have been attempts to apply biomass to composite resins containing polypropylene (abbreviated as 'PP') used in automotive interior parts.

[0004] Conventional biomass-applied PP composite resin compositions are manufactured by mixing PP and bio-polyethylene (abbreviated as 'Bio-PE').

[0005] Conventional bio-PP composite resins for automotive interior materials were manufactured by applying 10% Bio-PE to PP and adding polyolefin elastomer (abbreviated as 'POE') and talc. However, when the Bio-PE content exceeded 10%, the mechanical properties of the final bio-PP composite resin, particularly heat resistance, deteriorated, resulting in unsatisfactory results in component reliability evaluations.

[0006] Compounding of a composite resin containing 10% Bio-PE can be done without using a separate compatibilizer, which is possible due to the chemical similarity and similarity of crystal structure between polypropylene (PP) and polyethylene (abbreviated as 'PE'), similar melt behavior, low interfacial tension between PP and PE, and most importantly, because only a small amount (about 10% or less) of Bio-PE is mixed.

[0007] However, if the application ratio of Bio-PE exceeds 10%, mechanical properties deteriorate, and there are limitations in passing component reliability evaluations. Since PP and PE do not have complete compatibility, a significant phase separation occurs when the PE content increases. Consequently, stress transfer at the interface is not effectively achieved, leading to a deterioration in mechanical properties. This is the reason why the criteria cannot be met during component reliability evaluations.

[0008] Therefore, to solve these problems, it is necessary to develop a new thermoplastic composite resin composition that can increase the biomass application rate while satisfying the mechanical properties required for products applied to automotive parts and passing reliability evaluations.

[0009]

[0010] The present invention aims to solve the above problems, and the objective of the present invention is to provide an eco-friendly composite resin composition incorporating biomass that can maintain excellent mechanical properties while increasing the Bio-PE content, and a molded article manufactured thereby.

[0011] The objectives of the present invention are not limited to those mentioned above, and other objectives and advantages of the present invention not mentioned may be understood from the following description and will be more clearly understood by the embodiments of the present invention. Furthermore, it will be readily apparent that the objectives and advantages of the present invention can be realized by the means and combinations thereof set forth in the claims.

[0012]

[0013] According to one embodiment of the present invention, an eco-friendly composite resin composition may be provided comprising: (A) 40% to 57% by weight of a highly crystalline polypropylene copolymer resin; (B) 10% to 25% by weight of a bio-polyethylene (Bio-PE) resin; (C) 5% to 10% by weight of a polyolefin elastomer; (D) 15% to 20% by weight of an inorganic filler; and (E) 3% to 5% by weight of a compatibilizer; wherein the melt index of (A) the highly crystalline polypropylene copolymer resin (@230℃, 2.16 kg) is 0.5 g / 10min to 110 g / 10min, and the melt index of (B) the bio-polyethylene (Bio-PE) resin (@190℃, 2.16 kg) is 19 g / 10min to 21 g / 10min.

[0014] According to another aspect of the present invention, a molded article made of an eco-friendly composite resin composition according to one aspect of the present invention can be provided.

[0015]

[0016] The eco-friendly composite resin composition of the present invention and the molded article produced thereby have the effect of exhibiting excellent mechanical properties while containing a high proportion of Bio-PE.

[0017] Specifically, if the eco-friendly composite resin composition of the present invention contains 10% or more Bio-PE, preferably 20% Bio-PE, the content of olefin-based synthetic resin can be reduced, thereby enabling the production of an eco-friendly product. Accordingly, a molded article produced by the composite resin composition can secure heat resistance sufficient to pass the reliability evaluation of heat-resistant automotive interior materials.

[0018] The eco-friendly composite resin composition of the present invention has a renewable biocarbon content (C) determined according to ASTM D 6866. 14The biomass content containing ) is 20 weight% or more, which can exhibit high eco-friendly characteristics.

[0019] In addition to the effects described above, the effects of the present invention are described together with the details for implementing the invention below.

[0020]

[0021] Figure 1 shows the test results according to ASTM D 6866 of the eco-friendly composite resin composition of Example 1 of the present invention.

[0022]

[0023] The aforementioned objectives, features, and advantages are described in detail below with reference to the attached drawings, thereby enabling those skilled in the art to easily implement the technical concept of the present invention. In describing the present invention, detailed descriptions of known technologies related to the present invention are omitted if it is determined that such descriptions would unnecessarily obscure the essence of the invention. Hereinafter, preferred embodiments according to the present invention will be described in detail with reference to the attached drawings. In the drawings, the same reference numerals are used to indicate the same or similar components.

[0024] Where terms such as "comprising," "having," "consisting of," "arranging," or "having" are used for a component in this specification, other parts may be added unless "only" is used. Where a component is expressed in the singular, it includes cases where it is included in the plural unless specifically stated otherwise.

[0025] In this specification, "a and / or b" means a, b, or a and b unless specifically stated otherwise, and "c to d" means c or more and d or less unless specifically stated otherwise.

[0026] Unless specifically stated otherwise in this specification, '%' and 'ratio(:)' may be interpreted as 'weight%' and 'weight ratio', respectively, unless otherwise noted.

[0027] In interpreting the components in this specification, they are interpreted to include an error range even if there is no separate explicit description.

[0028]

[0029] The present invention will be described in more detail below.

[0030] The eco-friendly composite resin composition of the present invention may comprise (A) a highly crystalline polypropylene copolymer resin; (B) a bio-polyethylene (Bio-PE) resin; (C) a polyolefin elastomer; (D) an inorganic filler; and (E) a compatibilizer, and is characterized in that, in particular, the above (B) bio-polyethylene resin is included in a large amount unlike conventional technology, while exhibiting excellent mechanical properties sufficient for use in automotive parts.

[0031]

[0032] (A) Highly crystalline polypropylene copolymer resin

[0033] In the present invention, (A) a high-crystallinity polypropylene copolymer resin is used as the base resin of an eco-friendly composite resin composition. High-crystallinity polypropylene, which has high crystallinity unlike conventional polypropylene, is also known as HIPP (High Isotacticity Polypropylene) or HSPP (High Stiffness Polypropylene) and can be used in place of conventional polypropylene for the purpose of improving impact resistance, high hardness, and scratch resistance. High-crystallinity polypropylene has higher crystallinity than conventional commercial polypropylene, and due to its high hardness, it exhibits strengths such as 20-40% higher stiffness, excellent heat resistance, and scratch resistance compared to conventional polypropylene, while having similar impact resistance.

[0034] When the total weight of the eco-friendly composite resin composition of the present invention is 100% by weight, the (A) highly crystalline polypropylene copolymer resin may be included in an amount of 40% to 57% by weight, for example, 50% to 55% by weight. If the content of (A) highly crystalline polypropylene copolymer resin is below the lower limit, moldability may be reduced, and if it exceeds the upper limit, there may be a problem of reduced impact strength.

[0035] It is preferable that the above (A) highly crystalline polypropylene copolymer resin satisfy an isotactic index (II) of 97.5 to 99.5%. If a resin with an isotactic index of less than 97.5% is used, the rigidity and hardness of the part manufactured by injection molding will decrease, making it difficult to satisfy part reliability. The higher the isotactic index, the greater the degree of crystallization of polypropylene. As long as it satisfies the above isotactic index, any polypropylene copolymer resin synthesized with any monomer and capable of being used for injection molding may be used without limitation. For example, a propylene homopolymer or a copolymer of propylene with 10 mol% or less of ethylene or C4 to C10 olefin monomer may be used.

[0036] The melt index (@230℃, 2.16 kg) of the above (A) highly crystalline polypropylene copolymer resin may be 0.5 g / 10 min to 110 g / 10 min, for example, 1 g / 10 min to 80 g / 10 min, for example, 10 g / 10 min to 50 g / 10 min. If the melt index of the above (A) highly crystalline polypropylene copolymer resin is below the above lower limit, extrusion processing and injection moldability may be reduced, and if it exceeds the above upper limit, there may be a problem of reduced impact strength.

[0037]

[0038] (B) Bio-polyethylene (Bio-PE) resin

[0039] The eco-friendly composite resin composition of the present invention can achieve excellent mechanical properties while enhancing eco-friendliness, particularly by containing a large amount of Bio-PE. A composite resin containing approximately 10 weight percent of Bio-PE can undergo the compounding process without the use of a separate compatibilizer, which is attributed to the chemical similarity and crystal structure similarity between PP and PE, similar melting behavior, and low interfacial tension between PP and PE. However, if the application ratio of Bio-PE exceeds 10 weight percent, mechanical properties deteriorate, and there are limitations in passing component reliability evaluations. Since PP and PE do not have complete compatibility, distinct phase separation occurs when a certain amount is applied or more is present. Consequently, stress transfer at the interface is not effectively achieved, leading to a deterioration in mechanical properties. This ultimately becomes the reason why the component fails to meet the standard criteria during reliability evaluation after being manufactured into a part. Accordingly, when the total weight of the eco-friendly composite resin composition of the present invention is 100% by weight, the (B) bio-polyethylene (Bio-PE) resin may be included in an amount of 10% to 25% by weight, preferably 20% to 25% by weight, which is a very high amount considering that the maximum content in the prior art is about 10% by weight.

[0040] The melt index of the above (B) bio-polyethylene (Bio-PE) resin (@190 ℃, 2.16 kg) may be 19 g / 10 min to 21 g / 10 min, and when the above range is satisfied, excellent extrusion processability and injection moldability can be achieved when applied to a composite resin.

[0041] The above (B) bio-polyethylene (Bio-PE) resin may include high-density polyethylene (HDPE) resin derived from biomass. For example, the sugar from sugarcane is crystallized and separated, and the remaining molasses is squeezed several times. Then, microorganisms are added to the molasses residue to ferment it, during which ethanol gas is generated. Then, Bio-PE can be manufactured by dehydrating it and synthesizing it in the same way as general PE, but is not limited thereto.

[0042]

[0043] (C) Polyolefin elastomer

[0044] In order to secure mechanical properties such as impact resistance at low temperatures and dimensional stability, the eco-friendly composite resin composition of the present invention further incorporates (C) polyolefin elastomer (POE) as a thermoplastic elastomer. When the total weight of the eco-friendly composite resin composition of the present invention is 100% by weight, the (C) polyolefin elastomer may be included in an amount of 5% to 10% by weight, for example, 6% to 9% by weight, or for example, 7% to 8% by weight. If the content of (C) polyolefin elastomer is below the lower limit, there may be problems such as reduced mechanical properties, reduced impact resistance, and reduced dimensional stability (smaller dimensions). If it exceeds the upper limit, there may be problems such as reduced dimensional stability (larger dimensions) and increased ductility, resulting in insufficient rigidity as a part.

[0045] According to one example, the polyolefin elastomer (C) above may be an ethylene-based copolymer. For example, a copolymer of ethylene and an α-olefin having 4 to 10 carbon atoms may be used, and the ethylene-α-olefin random copolymer may have an α-olefin content of 20 to 50 weight%. For example, the α-olefin may be 1-butene, 1-pentene, 1-hexene, 1-heptene, 1-octene, 1-decene, etc.

[0046] According to one example, the above-mentioned polyolefin elastomer (C) may be selected to satisfy a glass transition temperature (Tg) of -60°C to -45°C, and the above-mentioned polyolefin elastomer (C) may satisfy, for example, a weight-average molecular weight in the range of 100,000 g / mol to 300,000 g / mol. Generally, it is known that polyolefin elastomers with high molecular weight and high viscosity have low glass transition temperatures; however, as the glass transition temperature decreases, the impact strength of the manufactured molded article can be increased, but viscosity also increases, and consequently, the melt index decreases, which may lead to a decrease in injection moldability. On the other hand, as the glass transition temperature increases, viscosity and the melt index increase, resulting in excellent injection moldability, but there is a disadvantage in that the impact strength of the manufactured molded article decreases. Therefore, considering these points, it is desirable for the glass transition temperature of the (C) polyolefin elastomer to satisfy the above range.

[0047]

[0048] (D) Weapon filler

[0049] The eco-friendly composite resin composition of the present invention includes (D) an inorganic filler, thereby increasing the surface activity effect and exhibiting resistance to shrinkage changes, which can improve moldability when manufactured as a synthetic resin and improve mechanical properties. When the total weight of the eco-friendly composite resin composition of the present invention is 100% by weight, the (D) inorganic filler may be included in an amount of 15% to 20% by weight, for example, 16% to 19% by weight, or for example, 17% to 18% by weight. If the content of (D) inorganic filler is below the lower limit, there may be problems with reduced mechanical properties and reduced dimensional stability (dimensions becoming smaller), and if it exceeds the upper limit, there may be problems with reduced dimensional stability (dimensions becoming larger).

[0050] According to one example, the inorganic filler (D) may include one or more of talc, glass fiber, talc, calcium carbonate, and kaolin, and for example, talc may be used. According to one example, the inorganic filler (D) may have an average diameter of 3 μm to 10 μm, and it is preferable to have an average diameter of, for example, 4 μm to 8 μm. If the average diameter of the inorganic filler (D) is below the lower limit, the action and effect intended to be exhibited by including the inorganic filler may be negligible, and if it exceeds the upper limit, there may be problems such as reduced dispersibility within the composite resin composition, resulting in reduced mixability and injection moldability.

[0051]

[0052] (E) Commercialization agent

[0053] In order to solve the problem of reduced compounding processability and reduced miscibility with PP when a high amount of (B) Bio-PE is incorporated, the eco-friendly composite resin composition of the present invention includes (E) a compatibilizer. This provides the advantage of satisfying the mechanical properties required by automotive parts and passing reliability evaluations while increasing the application ratio of Bio-PE.

[0054] According to one example, (E) a compatibilizer may be a polyolefin elastomer-based polymer (MAH-g-POE) grafted with maleic anhydride (MAH). For example, it is preferable to use a polyethylene elastomer polymer grafted with maleic anhydride (MAH). When such a polypropylene polymer grafted with maleic anhydride is applied, there is an advantage of excellent compatibility within the eco-friendly composite resin composition of the present invention and improved impact strength at room temperature and low temperature.

[0055] As the above (E) compatibilizer, MAH-g-POE may be a polyolefin elastomer-based polymer grafted with maleic anhydride at a ratio of 0.5 to 2 weight percent. If the ratio of the grafted maleic anhydride is less than 0.5 weight percent, it may be difficult to function as a compatibilizer between (A) a highly crystalline polypropylene resin and (B) Bio-PE, and if it exceeds 2 weight percent, the compatibility between (E) MAH-g-POE and components (A) and / or (B) may be reduced, leading to a problem where mechanical properties are significantly degraded.

[0056] When the total weight of the eco-friendly composite resin composition of the present invention is 100% by weight, the compatibilizer (E) may be included in an amount of 3% to 5% by weight, for example, 3% by weight. If the content of the compatibilizer (E) is below the lower limit, there may be problems such as a decrease in mechanical properties like impact strength and a decrease in dimensional stability (dimensions becoming smaller), and if it exceeds the upper limit, the flexural strength and flexural modulus characteristics may deteriorate, the heat deformation temperature may not reach the target of 90°C, resulting in poor heat deformation characteristics and a decrease in dimensional stability (dimensions becoming larger).

[0057] According to one example, the melt index of the above (E) compatibilizer (190℃ / 2.16kg condition, ASTM D1238) may be in the range of 1g / 10min to 120g / 10min, and when satisfying the above range, if the melt index is below the lower limit, excellent extrusion processing and injection molding performance may be achieved.

[0058] According to one example, the above (E) compatibilizer is preferably satisfies a density of 0.87 g / cm³ to 0.95 g / cm³ as measured according to ASTM D792 in order to achieve excellent compatibility as a composite resin composition and excellent processability and injection moldability.

[0059]

[0060] The eco-friendly composite resin composition of the present invention is a thermoplastic resin composition, and in addition to the above components (A) to (E), within a range satisfying the physical properties intended by the present invention, antioxidants, processing lubricants, UV stabilizers, long-term heat stabilizers, antistatic agents, flame retardants, antibacterial agents, and colorants may be additionally used as additives, either alone or in combination, depending on the application, but are not limited thereto.

[0061] According to one example, the eco-friendly composite resin composition of the present invention is manufactured into a molded article by extrusion followed by injection molding, and the processability is excellent when manufacturing into a molded article because the melt index of the eco-friendly composite resin composition itself is appropriate.

[0062] As the eco-friendly composite resin composition of the present invention contains a large amount of Bio-PE, the biocarbon content (C) measured according to ASTM D6866 standard 14 It can achieve high eco-friendliness of 20 weight% or more. In addition, it can exhibit overall excellent mechanical properties, such as high tensile strength and elongation, high flexural strength and flexural modulus, improved impact strength at room and low temperatures, and low thermal deformability due to a high heat deformation temperature.

[0063]

[0064] The present invention will be explained in more detail below through examples. However, the following examples are merely illustrative of the present invention, and the scope of the present invention is not limited to the following examples.

[0065]

[0066] [Example 1]

[0067] (A) Polypropylene resin with an isotactic index (II) of 98% and a melt index (@230℃, 2.16 kg) of 30 g / 10 min; (B) Bio-polyethylene (Bio-PE) as Braskem’s SHA7260 resin (HDPE, melt index (@190℃, 2.16 kg) of 20 g / 10 min); (C) Ethylene-based copolymer as a polyolefin elastomer which is a copolymer of ethylene and a C6 α-olefin (glass transition temperature of -50℃ and molecular weight of approximately 200,000 g / mol); (D) Talc having an average diameter of 4 µm; (E) As MAH-g-POE, Fusabond N493 (specific gravity: 0.87 g / cm³, melt index (@190℃, 2.16kg) is 1.6 g / 10min, melting point is 51℃) was prepared as a raw material and mixed in the composition ratio as described in Table 1 below to prepare a composite resin composition.

[0068] Then, the composite resin composition was kneaded using a twin-screw extruder (Changsung PNR, 48Φ). At this time, the kneading conditions were optimized by setting the temperature of the hopper section of the extruder to 190℃ and the temperature of the nozzle section to 230℃, the extrusion rate to 50kg / hour, and the screw rotation speed to 200~250 RPM.

[0069] The extruded composite resin composition was fed into an extruder for pelletization, and the molten material discharged from the extruder die head was pelletized in a strand manner to produce uniform pellets with a diameter of 3 mm. Using the produced pellets, final molded specimens were manufactured by injection molding in the manner required according to the experimental examples of the school, and their physical properties were measured.

[0070]

[0071] [Example 2]

[0072] The composite resin composition and the final molded product specimen were prepared in the same manner as in Example 1 above, but differed only in that the content of components (A) and (B) was changed as shown in Table 1 below.

[0073]

[0074] [Comparative Example 1]

[0075] The composite resin composition and the final molded product specimen were prepared in the same manner as in Example 1 above, but with differences in that the polypropylene resin of (A) had an isotactic index (II) of 95% and the content of components (A) and (B) was changed as shown in Table 2 below.

[0076]

[0077] [Comparative Example 2]

[0078] The composite resin composition and the final molded product specimen were prepared in the same manner as in Example 1 above, but with a difference in that the content of components (A) and (B) was changed as shown in Table 2 below and component (E) was not used.

[0079]

[0080] [Comparative Example 3]

[0081] The composite resin composition and the final molded product specimen were prepared in the same manner as in Example 1 above, except that (E) MAH-g-PP, which has a specific gravity of 0.92 g / cm³, a melt index (@230℃, 2.16kg) of 10 g / 10min, and a melting point of 165℃, was used instead of MAH-g-POE.

[0082]

[0083] [Comparative Examples 4 to 7]

[0084] The composite resin composition and the final molded product specimen were prepared in the same manner as in Example 1 above, but differed only in that the content of components (A), (B), and (E) was varied as shown in Table 3 below.

[0085]

[0086] [Experimental Example]

[0087] The melt index of the composite resin compositions of Examples 1 to 2 and Comparative Examples 1 to 3 was measured according to Experimental Example 1.

[0088] The physical properties of the molded specimens of Examples 1 and 2 and Comparative Examples 1 to 3 were measured according to Experimental Examples 2 to 7, and the biocarbon content of Example 1 was also measured according to Experimental Example 7. The results of Experimental Examples 1 to 7 are shown in Tables 1 and 2 below. In Tables 1 to 3 below, the biocarbon content of Example 2 and Comparative Examples 1 to 3 is indicated by "-" to mean that it was not measured.

[0089]

[0090] Experimental Example 1) Melt Index (MI) (Unit: g / 10 min)

[0091] The melt index was measured under conditions of 190°C and 21.6 kg according to ISO 1133 standards. In order to exhibit excellent processability, the present invention aimed to have a melt index of 15 g / 10 min to 25 g / 10 min.

[0092]

[0093] Experimental Example 2) Tensile strength (TS) (Unit: MPa) and elongation (Unit: %)

[0094] Tensile strength and elongation were measured according to ISO 527 standards. The present invention aimed to have a tensile strength of 20 MPa or more and an elongation of 200% or more.

[0095]

[0096] Experimental Example 3) Flexural strength (FS) (Unit: MPa)

[0097] Flexural strength was measured according to ISO 178 standards. The present invention aimed to have a flexural strength of 30 MPa or more.

[0098]

[0099] Experimental Example 4) Flexural modulus (FM) (Unit: MPa)

[0100] The flexural modulus was measured according to the ISO 178 standard. The present invention aimed to have a flexural strength of 1,800 MPa or more.

[0101]

[0102] Experimental Example 5) Impact Strength (Unit: kJ / m² 2 )

[0103] In accordance with ISO 180 standards, the IZOD impact strength at room temperature (@23℃) and at low temperature (@-10℃) were measured, respectively. In this invention, the IZOD impact strength (@23℃) and the IZOD impact strength at low temperature (@-10℃) are each 20 kJ / m² 2 Above and 4 kJ / m 2 I aimed to have an ideal.

[0104]

[0105] Experimental Example 6) Heat deflection temperature (HDT) (Unit: °C)

[0106] The heat distortion temperature was measured according to the ISO 75 standard. The present invention aimed to have a heat distortion temperature of 90°C or higher.

[0107]

[0108] Experimental Example 7) Biocarbon Content (Unit: weight%)

[0109] Biocarbon (C) according to ASTM D6866-24 Method B (AMS) standard 14 The content was measured. In this invention, the goal was to have a biocarbon content of 20% or more.

[0110]

[0111] [Table 1]

[0112]

[0113]

[0114] [Table 2]

[0115]

[0116]

[0117] [Table 3]

[0118]

[0119]

[0120] Referring to Tables 1 to 3 above, Example 1 of the present invention satisfies all the mechanical properties intended by the present invention, and since the biocarbon content was measured at 25 wt%, it can be seen that it satisfies the eco-friendliness of a high biomass content. Since this is derived from the Bio-PE content, it is expected that a similar level of biocarbon content can be satisfied when the Bio-PE content is similar. In Comparative Example 1, the isotactic index of the polypropylene resin had a value lower than that specified in the present invention, so the flexural modulus did not reach the intended level. In addition, in Comparative Example 2, as a result of increasing the Bio-PE content without including any compatibilizer, it was confirmed that the impact strength at room temperature and low temperature decreased. Furthermore, in Comparative Example 3, MAH-g-PP was used instead of MAH-g-POE, and since the impact strength at room temperature and low temperature decreased, it is presumed that this is due to the low compatibility of MAH-g-PP with Bio-POE. In addition, as in Comparative Examples 4 and 6, when the content of (E) compatibilizer becomes too low compared to the target content, a problem of reduced impact strength was observed, and as in Comparative Examples 5 and 7, when the content of (E) compatibilizer becomes higher than the target content, a problem of reduced physical properties was confirmed, such as reduced flexural strength and flexural modulus and a lower heat deformation temperature.

[0121]

[0122] Although an embodiment of the present invention has been described above, those skilled in the art may modify and change the present invention in various ways by adding, changing, deleting, or adding components, etc., without departing from the spirit of the present invention as described in the claims, and such modifications and changes are also to be included within the scope of the rights of the present invention.

Claims

1. (A) 40% to 57% by weight of highly crystalline polypropylene copolymer resin; (B) 10% to 25% by weight of bio-polyethylene (Bio-PE) resin; (C) 5% to 10% by weight of polyolefin elastomer; (D) 15% to 20% by weight of inorganic filler; and (E) comprising 3% to 5% by weight of a compatibilizer; and The melt index (@230℃, 2.16 kg) of the above (A) highly crystalline polypropylene copolymer resin is 0.5 g / 10 min to 110 g / 10 min, and The melt index (@190℃, 2.16 kg) of the above (B) bio-polyethylene (Bio-PE) resin is 19 g / 10 min to 21 g / 10 min, Eco-friendly composite resin composition.

2. In Paragraph 1, The above (A) highly crystalline polypropylene copolymer resin satisfies an isotactic index (II) of 97.5 to 99.5% and a melt index (@230℃, 2.16 kg) of 0.5 g / 10 min to 110 g / 10 min, an eco-friendly composite resin composition.

3. In Paragraph 1, The above (B) bio-polyethylene (Bio-PE) resin is an eco-friendly composite resin composition comprising high-density polyethylene (HDPE) resin derived from biomass.

4. In Paragraph 1, The above (C) polyolefin elastomer comprises an ethylene copolymer having a glass transition temperature (Tg) of -60°C to -45°C, and is an eco-friendly composite resin composition.

5. In Paragraph 4, The above ethylene-based copolymer is an eco-friendly composite resin composition comprising a copolymer of ethylene and an α-olefin having 4 to 10 carbon atoms.

6. In Paragraph 1, The above (D) inorganic filler comprises one or more of talc, glass fiber, talc, calcium carbonate and kaolin, and An eco-friendly composite resin composition in which the above (D) inorganic filler has an average diameter of 3 μm to 10 μm.

7. In Paragraph 1, The above (E) compatibilizer satisfies the condition that the melt index (@190℃, 2.16 kg) is 1.0 g / 10min to 120 g / 10min, and The above (E) compatibilizer has a density of 0.87 g / cm³ as measured according to ASTM D792. 3 Up to 0.95 g / cm³ 3 Eco-friendly composite resin composition.

8. In Paragraph 1, The above (E) compatibilizer is an eco-friendly composite resin composition comprising a maleic anhydride-grafted polyolefin elastomer (MAH-g-POE).

9. In Paragraph 8, The above (E) compatibilizer is an eco-friendly composite resin composition comprising a polyethylene elastomer polymer grafted with maleic anhydride.

10. In Paragraph 1, The above eco-friendly composite resin composition is An eco-friendly composite resin composition satisfying a melt index (@230℃, 2.16 kg) of 15 g / 10 min to 25 g / 10 min.

11. A molded article manufactured from an eco-friendly composite resin composition according to any one of claims 1 to 10, satisfying the condition that the tensile strength measured according to ISO 527 is 20 MPa or higher.

12. In Paragraph 11, The above molded product is A molded product satisfying the following: an elongation of 200% or more as measured according to ISO 527, a flexural strength of 30 MPa or more as measured according to ISO 178, and a flexural modulus of 1800 MPa or more.

13. In Paragraph 11, The above molded product is IZOD impact strength at room temperature (@23℃) measured according to ISO 180 standard is 20 kJ / m 2 That is all, and the IZOD impact strength at low temperature (@-10℃) is 4 kJ / m 2 A molded product that satisfies the ideal.

14. In Paragraph 11, The above molded product is The heat distortion temperature measured according to ISO 75 is 90℃ or higher, and the biocarbon content (C) measured according to ASTM D6866 14 A molded product satisfying the condition that ) is 20% or more.

15. In Paragraph 11, A molded product used as an automotive interior part.

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