Eco-friendly resin composition for injection-molded automobile interior components and injection-molded automobile interior components comprising same

Abstract

The present invention relates to an eco-friendly resin composition for injection-molded automotive interior components, comprising recycled resin pellets derived from high-density polyethylene waste and virgin polypropylene resin pellets, wherein the eco-friendly resin composition has an MI 2.16 of 3 to 120 g / 10 min and a melt index ratio (MI 5.0 / MI 2.16) of 1.5 to 10.0, where MI 2.16 is the melt index at 230 °C under a 2.16 kg load, and MI 5.0 is the melt index at 230 °C under a 5.0 kg load. The present invention provides an eco-friendly polypropylene resin composition using recycled resin derived from high-density polyethylene waste, which is suitable for carbon-neutral applications that contributes to carbon-dioxide reduction, and exhibits excellent injection moldability, outstanding mechanical properties, good deodorization performance, and reliable detectability of recycled-resin content, and thus can be usefully employed in injection-molded automotive interior components.

Description

Eco-friendly resin composition for injection molding of automotive interior parts and injection molding of automotive interior parts containing the same

[0001] The present invention relates to an eco-friendly resin composition for an injection molded product for an automobile interior and an injection molded product for an automobile interior comprising the same.

[0002] Recently, as carbon dioxide emissions, the main culprit of global warming, have increased worldwide, the need for 'carbon neutrality', which means reducing net carbon dioxide emissions emitted by humans to '0', has emerged as a solution, leading to the declaration of the so-called 'Carbon Neutrality 2050' around the world.

[0003] Accordingly, various methods are being proposed and significant efforts are being made to achieve carbon neutrality in each sector. For example, the automotive industry is actively promoting plastic material recycling, aiming to use recycled resins derived from plastic waste in plastic parts within automobiles. A prime example is Europe, which plans to mandate the use of 25% recycled plastics (75% Post-Consumer Recycled (PCR) materials and 25% plastics derived from scrapped vehicles) in new car plastics starting in 2031. Failure to meet this standard could lead to a serious situation where car exports to Europe are blocked.

[0004] Automotive parts made of plastic vary by vehicle, but the average is around 200 kg per vehicle. Various materials are used, but polypropylene accounts for about 40%, or about 80 kg per vehicle, and most of the parts are manufactured by injection molding. Representative automotive parts include door trims, instrument panels, dashboards, pillar trims, consoles, luggage side trims, package trays, seatback boards, armrest boards, heater cases, tailgate trims, sun visors, and glove boxes. In order to comply with the European ELV end-of-life vehicle recycling regulations, polypropylene film products with the nature of disposable products can be considered as a candidate for PCR materials made of polypropylene. However, polypropylene film is rarely used alone. For example, it is mostly used in packaging materials such as snack bags and ramen bags, where films of various materials such as polypropylene film, polyester film, and metallized film are laminated. Therefore, most polypropylene film waste is incinerated or landfilled after disposal, making it realistically very difficult to obtain polypropylene recycled resin from polypropylene film waste as a PCR material. Meanwhile, polypropylene containers for food delivery are promising as PCR materials because they are made solely of polypropylene, not composite materials. However, due to the lack of recycling infrastructure, including food waste removal, most of them are incinerated or landfilled, making it very difficult to obtain polypropylene recycled resin from them.

[0005] As the availability of polypropylene-based PCR materials became increasingly difficult, many researchers sought entirely different approaches. They became interested in polypropylene resin compositions using recycled resin derived from high-density polyethylene waste, which, despite its poor compatibility with polypropylene and potential for poor mechanical properties, was not readily available.

[0006] The background to this idea is that in the case of high-density polyethylene products, many are used individually rather than in composites, and are highly disposable, and the waste from them is also enormous, reaching millions of tons per year. Examples of the high-density polyethylene products include film products such as shopping bags, delivery envelopes, and secondary battery separators; bottle products such as milk bottles, shampoo bottles, detergent bottles, and motor oil bottles; pallets, transport boxes, and pipes. In other words, efforts are being made to develop an eco-friendly polypropylene resin composition using high-density polyethylene recycled resin obtained by crushing and melting and extruding the above waste, and to manufacture injection molded automobile interior parts using this composition.

[0007] However, depending on the type of waste used, many attempts have been made to manufacture a resin composition by simply mixing high-density polyethylene recycled resin and polypropylene virgin resin with various melting indices in a certain ratio and to perform injection molding. However, the problem of a large number of various types of molding defects such as insufficient filling (non-molding), black lines, cracks, flow marks, flash, and jetting has not been solved, and thus, there is a serious problem of very poor injection moldability, and a solution to this problem is urgently requested.

[0008] In conclusion, the development of an eco-friendly polypropylene resin composition with excellent injection moldability using recycled resin derived from high-density polyethylene waste and an injection-molded automobile interior product obtained therefrom is urgent and essential.

[0009] One object of the present invention is to provide an eco-friendly polypropylene resin composition having excellent injection moldability using recycled resin derived from high-density polyethylene waste, and an injection molded automobile interior material product obtained therefrom.

[0010] One object of the present invention is to provide an eco-friendly polypropylene resin composition using recycled resin derived from high-density polyethylene waste, which has excellent injection moldability even when using a large amount of recycled resin derived from high-density polyethylene waste, has excellent mechanical properties, deodorizing properties, and recycled resin content recognition, and is suitable for carbon neutrality with a carbon dioxide reduction effect, and an injection molded product for automobile interior materials obtained therefrom.

[0011] One aspect of the present invention is an eco-friendly resin composition obtained by melt blending or dry blending, comprising high-density polyethylene waste-derived recycled resin pellets and polypropylene new resin pellets,

[0012] The present invention relates to an eco-friendly resin composition for injection molded automobile interior parts, wherein the melting index of the eco-friendly resin composition at 230°C and a 2.16 kg load is MI2.16, and the melting index at 230°C and a 5.0 kg load is MI5.0, and the MI2.16 is 3.0 to 120 g / 10 min, and the melting index ratio (MI5.0 / MI2.16) is 1.5 to 10.0.

[0013] In the above eco-friendly resin composition, when the melting index at 230°C and 2.16 kg load is MI2.16, and the melting index at 230°C and 5.0 kg load is MI5.0, an eco-friendly resin composition for an injection-molded automobile interior material is provided, in which MI2.16 is 6 to 110 or 10 to 100 g / 10 min, and the melting index ratio (MI5.0 / MI2.16) is 1.5 to 9 or 2.0 to 8.0.

[0014] Even better, the above-mentioned eco-friendly resin composition provides an eco-friendly resin composition for injection molded automobile interior parts, wherein the melting index at 230°C and 2.16 kg load is MI2.16, the melting index at 230°C and 5.0 kg load is MI5.0, and the MI2.16 is 20 to 70 g / 10 min, and the melting index ratio (MI5.0 / MI2.16) is 3.0 to 7.0.

[0015] In one aspect, the recycled resin pellets derived from high-density polyethylene waste may be pellets obtained by crushing and melting and extruding one or more waste materials selected from the group consisting of films, bottles, pallets, transport boxes, and pipes made of high-density polyethylene material discarded after use.

[0016] In one embodiment, the polypropylene may be at least one selected from the group consisting of a polypropylene homopolymer, a polypropylene random copolymer, and a polypropylene block copolymer.

[0017] In one aspect, the eco-friendly resin composition may further include a crystal nucleating agent.

[0018] In one embodiment, the crystal nucleating agent may be one or a mixture of two or more selected from the group consisting of a sorbitol-based crystal nucleating agent, a nonitol-based crystal nucleating agent, an organic acid-based crystal nucleating agent, a phenol-based crystal nucleating agent, and a phosphate ester-based crystal nucleating agent.

[0019] In one aspect, the eco-friendly resin composition may further contain an inorganic deodorant.

[0020] In one embodiment, the inorganic deodorant may be one or a mixture of two or more selected from the group consisting of porous active catalyst ceramic particles, porous zeolite particles, porous silica aerogel particles, and porous calcium silicate particles.

[0021] In one aspect, the eco-friendly resin composition may further contain a polyolefin-based elastomer.

[0022] In one embodiment, the polyolefin-based elastomer may be one or more selected from the group consisting of a polyethylene-based elastomer, a polypropylene-based elastomer, and an ethylene-propylene copolymer-based elastomer.

[0023] In one aspect, the eco-friendly resin composition may further include inorganic particles.

[0024] In one embodiment, the inorganic particles may be one or a mixture of two or more selected from the group consisting of talc, calcium carbonate, mineral, glass fiber, clay, kaolin, silica, diatomaceous earth, magnesium carbonate, calcium chloride, calcium sulfate, aluminum hydroxide, zinc oxide, magnesium hydroxide, titanium oxide, alumina, mica, asbestos powder, silicate clay, and boehmite.

[0025] In one aspect, the eco-friendly resin composition may further include a polymer-based compatibilizer.

[0026] In one aspect, the eco-friendly resin composition may not contain a polymer-based compatibilizer or may contain 0.01 to 3 wt% of the polymer-based compatibilizer.

[0027] In one embodiment, the polymer-based compatibilizer may be one or a mixture of two or more selected from the group consisting of an ethylene-based olefin block copolymer, an ethylene-propylene-diene copolymer, an ethylene-vinylacetate copolymer, a styrene block copolymer, and a styrene-ethylene-butylene-styrene copolymer.

[0028] In one aspect, the eco-friendly resin composition may further contain recycled resin pellets derived from polypropylene waste.

[0029] In one aspect, the eco-friendly resin composition may further include at least one selected from a heat stabilizer, an ultraviolet stabilizer, an activator, a processing aid, a dispersant, and a pigment.

[0030] In one aspect, the colors of the recycled resin pellets derived from the high-density polyethylene waste and the pellets of the remaining components are different from each other, and the composition can be an eco-friendly resin composition for dry-blended injection-molded automobile interior parts.

[0031] In one embodiment, the pellets of the remaining components may further include at least one selected from polypropylene virgin resin pellets, masterbatch pellets containing a crystal nucleating agent, masterbatch pellets containing an inorganic deodorant, polyolefin elastomer pellets, masterbatch pellets containing inorganic particles, and polymer compatibilizer pellets.

[0032] In one aspect, the eco-friendly resin composition may have a content of 5 to 50 wt% of recycled resin pellets derived from high-density polyethylene waste.

[0033] Another aspect of the present invention provides an injection-molded automobile interior material product including the eco-friendly resin composition of the above aspect.

[0034] In one aspect, the injection molded automobile interior material product may have a flexural modulus of 1,000 MPa or more, an IZOD impact strength (23°C) of 20 kg·cm / cm or more, and an odor grade of 1 to 3 according to the Hyundai-Kia Motors standard MS300-34.

[0035] In addition, the present invention may be an injection molded product of an automobile interior material selected from the group consisting of a door trim, an instrument panel, a dashboard, a pillar trim, a console, a luggage side trim, a package tray, a seat back board, an arm rest board, a heater case, a table gate trim, a sun visor, and a glove box.

[0036] According to one embodiment of the present invention, there is provided an eco-friendly polypropylene resin composition having excellent injection moldability including a recycled resin derived from high-density polyethylene waste, and an injection-molded automobile interior material product obtained therefrom.

[0037] In addition, the present invention is a resin composition suitable for carbon neutrality, which has excellent injection moldability, mechanical properties, deodorizing properties, and recognizability of recycled resin content, and has a carbon dioxide reduction effect, and is an eco-friendly polypropylene resin composition using recycled resin derived from high-density polyethylene waste, and can be usefully used in injection molded automobile interior parts.

[0038] Figure 1 is a photograph of an eco-friendly resin composition (10) made by dry blending two types of pellets: white-colored high-density polyethylene waste-derived recycled resin pellets (11) and dark brown-colored pellets of the remaining components (12).

[0039] Figure 2 is a photograph of an eco-friendly resin composition (20) dry-blended with four kinds of pellets: white-colored high-density polyethylene waste-derived recycled resin pellets (21), natural-colored polypropylene virgin resin pellets (22), pellets (23) of further included components obtained by melt-extruding a mixture of a crystal nucleating agent, inorganic particles, a polymer-based compatibilizer, an inorganic deodorant, and a polyolefin elastomer, and dark brown pigment masterbatch (24) pellets using polypropylene virgin resin as a carrier resin.

[0040] 10: Eco-friendly resin composition made by dry blending two types of pellets

[0041] 11: White-colored high-density polyethylene waste-derived recycled resin pellets

[0042] 12: Pellets of the remaining ingredients colored dark brown

[0043] 20: Eco-friendly resin composition made of dry blended four types of pellets

[0044] 21: White-colored high-density polyethylene waste-derived recycled resin pellets

[0045] 22: Natural colored polypropylene new resin pellets

[0046] 23: Pellets of further components obtained by melt-extruding a mixture of a crystal nucleating agent, inorganic particles, a polymer-based compatibilizer, an inorganic deodorant, and a polyolefin elastomer.

[0047] 24: Dark brown pigment masterbatch pellets using polypropylene as the carrier resin.

[0048] The present invention is further described in detail with the accompanying examples. However, the following examples are merely references for further explanation of the present invention and are not intended to limit the present invention, which may be implemented in various forms.

[0049] Additionally, unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is merely for the purpose of describing specific embodiments and is not intended to limit the invention.

[0050] Additionally, the singular forms used in the specification and the appended claims are intended to include the plural forms as well, unless the context clearly dictates otherwise.

[0051] The present invention seeks to find a solution to the mandatory use of 25% recycled plastic, consisting of 75% PCR material and 25% plastic derived from scrapped vehicles, in new vehicle manufacturing in Europe from 2031.

[0052] Plastics derived from scrapped vehicles are not a viable solution due to the difficulty of sorting components and other factors, making them uneconomical. Recycled plastics derived from PCR or PIR materials could be a more practical solution. However, candidates for PCR or PIR materials should be sourced from disposable, strong plastic waste, which is readily available in large quantities. However, the near-existence of single-use polypropylene waste makes this impractical. Therefore, alternative solutions are urgently needed.

[0053] A strong candidate is waste from products made of high-density polyethylene (HDPE). Examples include: HDPE film products, such as shopping bags, delivery envelopes, and secondary battery separators, which are produced in quantities of hundreds of thousands of tons annually; HDPE bottles, such as milk bottles, shampoo bottles, detergent bottles, and motor oil bottles; HDPE transport boxes, such as HDPE pallets, soft drink boxes, and liquor boxes; and HDPE pipes, such as gas pipes, water and sewage pipes, and pressure pipes. As long as the waste is made of HDPE, there are no restrictions on its shape or intended use.

[0054] When melting and injection molding polymers like polypropylene into products, the melt index (MI) is evaluated as a crucial means of predicting excellent injection moldability by considering the rheological properties of the polymer when melted. Typically, a high molecular weight polymer has a lower melt index, while a low molecular weight polymer has a higher melt index. However, depending on the desired injection molded product's shape (large or small, thick or thin, complex or simple), as well as other desired properties such as mechanical properties, a polymer with an appropriate melt index is required.

[0055] Therefore, when forming an injection molded product using polypropylene, it is preferable that the appropriate raw material have a melting index MI2.16 of 3 to 120 g / 10 min, 6 to 110 g / 10 min, and 10 to 100 g / 10 min at 230 ℃ and 2.16 kg load, and a polypropylene having an appropriate melting index is selected according to the shape and required properties of the product.

[0056] Considering the above viewpoints, two major problems were encountered in developing an eco-friendly polypropylene resin composition using recycled resin derived from high-density polyethylene waste.

[0057] The first is that most of the available high-density polyethylene waste-derived recycled resins have very low melting indexes.

[0058] High-density polyethylene waste undergoes a partial loss of molecular weight due to heat or light decomposition during use, and its molecular weight also decreases due to thermal decomposition during the process of crushing, melting, and extrusion to produce recycled resin pellets. This causes the melt index to tend to be higher than that of virgin high-density polyethylene resin. However, this recycled high-density polyethylene resin has a very low melt index for use as a raw material for injection molding, making it problematic to add large amounts for injection molding. In other words, most high-density polyethylene resins recovered as recycled resins are manufactured through extrusion or hollow extrusion. It is practically impossible to use recycled resins derived from films made of high-density polyethylene material manufactured by extrusion molding for injection molding because the MI2.16 is 0.06 to 0.30 g / 10 min, recycled resins derived from bottles made of high-density polyethylene material manufactured by hollow extrusion molding for injection molding because the MI2.16 is 0.5 to 3.0 g / 10 min, and recycled resins derived from pipes made of high-density polyethylene material manufactured by extrusion molding for injection molding because the MI2.16 is 0.06 to 0.30 g / 10 min. In the case of recycled high-density polyethylene resins having the above melting index, it is practically difficult to match the MI2.16 of 3.0 to 120 g / 10 min required for injection molded automobile interior parts even when mixed with virgin polypropylene resins having a very high melting index. Therefore, it is very difficult to provide an eco-friendly polypropylene resin composition having a content of recycled resin derived from high-density polyethylene waste, which contains 5 wt% or more, 15 wt% or more, 20 wt% or more, 30 wt% or more, 40 wt% or more, or 50 wt% or more of recycled resin as an eco-friendly resin composition.

[0059] The second problem is the most difficult to overcome, which is that the injection molding properties are very irregular and uneven. Several attempts have been made to manufacture a resin composition by adding an appropriate amount of recycled resin pellets derived from high-density polyethylene waste to virgin polypropylene resin pellets and melt-blending or dry-blending the resin composition, and adjusting the MI2.16 of the resin composition to 3.0 to 120 g / 10 min, which is suitable for injection molding. For example, injection molding was attempted with a resin composition melt-blended or dry-blended with recycled resin pellets derived from high-density polyethylene films with an MI of 0.06 to 0.30 g / 10 min and virgin polypropylene resin pellets with a very high melting index of 10 to 130 g / 10 min. However, during injection molding, a large number of various types of molding defects such as insufficient filling (short shots), black streaks, cracks, flow marks, flash, and jetting occurred, and above all, the results were uneven, resulting in very poor processing uniformity. Therefore, a composition should be manufactured that has excellent product uniformity according to processing and does not cause the above-mentioned problems stably even with slight changes in processing conditions, but these problems have not been solved yet. Despite these problems, the applicant has made efforts to commercialize the composition, but until the present invention, the defect rate was too high, and the product uniformity was very poor depending on changes in the processing machine, external conditions, or slight changes in the thermal sensor during processing.

[0060] Accordingly, the inventors of the present invention have noted that in the case of polymers such as high-density polyethylene, the rheological properties during melting are greatly influenced not only by the molecular weight of the polymer but also by the molecular weight distribution, which greatly affects the moldability. In addition, the inventors have noted that petrochemical companies that manufacture high-density polyethylene maintain excellent physical properties of the product while simultaneously providing excellent processability by having various molecular weight distributions such as unimodal and bimodal according to their own unique technologies. In other words, the inventors of the present invention have inferred that the moldability during injection molding of high-density polyethylene using recycled resin derived from waste high-density polyethylene material is very irregular because products with various molecular weight distributions from various manufacturers are indiscriminately mixed, and they have made efforts to solve this problem.

[0061] The inventor of the present invention has conducted repeated research to solve the above problem, and as a result, has introduced the melt index ratio, which is closely related to the molecular weight distribution of the polymer, separately from the melt index, which can evaluate the rheological properties during melting, as a means of predicting the moldability during injection molding. That is, when the MI2.16 of the resin composition including the recycled resin pellets derived from high-density polyethylene waste and the virgin polypropylene resin pellets is 3 to 120 g / 10 min, and at the same time, the melt index ratio (MI5.0 / MI2.16) is 1.5 to 10.0, 1.7 to 9, 2.0 to 8.0, 2.5 to 7.0, or 3.0 to 5.0, it has been found that excellent injection moldability is secured, that is, various types of molding defects such as insufficient filling (short shot), black streaks, cracks, flow marks, flash, and jetting are completely eliminated, and thus the present invention has been completed.

[0062] Advantageously, the above-mentioned eco-friendly resin composition provides an eco-friendly resin composition for injection molded automobile interior parts, wherein the melting index at 230°C, 2.16 kg load is MI2.16, and the melting index at 230°C, 5.0 kg load is MI5.0, and the MI2.16 is 3.0 to 120 g / 10 min, and the melting index ratio (MI5.0 / MI2.16) is 1.5 to 10.0.

[0063] More preferably, the above-mentioned eco-friendly resin composition provides an eco-friendly resin composition for injection molded automobile interior parts, wherein the melting index at 230°C and 2.16 kg load is MI2.16, and the melting index at 230°C and 5.0 kg load is MI5.0, and the MI2.16 is 6 to 110 g / 10 min, and the melting index ratio (MI5.0 / MI2.16) is 1.7 to 9.0.

[0064] More preferably, the above-mentioned eco-friendly resin composition provides an eco-friendly resin composition for injection molded automobile interior parts, wherein the melting index at 230°C, 2.16 kg load is MI2.16, and the melting index at 230°C, 5.0 kg load is MI5.0, and the MI2.16 is 10 to 100 g / 10 min, and the melting index ratio (MI5.0 / MI2.16) is 2.0 to 8.0.

[0065] Even better, the above-mentioned eco-friendly resin composition provides an eco-friendly resin composition for injection molded automobile interior parts, wherein the melting index at 230°C and 2.16 kg load is MI2.16, the melting index at 230°C and 5.0 kg load is MI5.0, and the MI2.16 is 20 to 70 g / 10 min, and the melting index ratio (MI5.0 / MI2.16) is 3.0 to 7.0.

[0066] That is, one aspect of the present invention is an eco-friendly resin composition obtained by melt blending or dry blending, and including high-density polyethylene waste-derived recycled resin pellets and polypropylene new resin pellets,

[0067] The above-mentioned eco-friendly resin composition relates to an eco-friendly resin composition for injection molding of automobile interior parts, wherein the MI2.16 is 3 to 120 g / 10 min and the melt index ratio (MI5.0 / MI2.16) is 1.5 to 10.0.

[0068] As a specific method for obtaining a resin composition under the above conditions, for example, first, MI2.16, MI5.0 and melt index ratio (MI5.0 / MI2.16) for the selected high-density polyethylene waste-derived recycled resin pellets are measured, and also MI2.16, MI5.0 and melt index ratio (MI5.0 / MI2.16) for the polypropylene virgin resin are measured, and then the mixing ratio is adjusted so that the MI2.16 of the obtained resin composition is 3 to 120 g / 10 min and the melt index ratio (MI5.0 / MI2.16) is 1.5 to 10.0, 1.7 to 9, 2.0 to 8.0, 2.5 to 7.0, or 3.0 to 5.0.

[0069] In some cases, the MI2.16, MI5.0 and melt index ratio (MI5.0 / MI2.16) of a plurality of high-density polyethylene waste-derived recycled resin pellets are measured and prepared, and further, the MI2.16, MI5.0 and melt index ratio (MI5.0 / MI2.16) of a plurality of polypropylene virgin resins are measured, and then the combination and mixing ratio are adjusted so that the resin composition obtained has MI2.16 of 3 to 120 g / 10 min and the melt index ratio (MI5.0 / MI2.16) is adjusted to 1.5 to 10.0, 1.7 to 9, 2.0 to 8.0, 2.5 to 7.0, or 3.0 to 5.0.

[0070] When the above melt index and melt index ratio are satisfied at the same time, excellent injection moldability is secured, which means that during injection molding, there are no various types of molding defects such as insufficient filling (short shots), black streaks, cracks, flow marks, flash, and jetting, and the molded product is manufactured uniformly and stably. In addition, under the same conditions, the injection molding machine cannot be changed, and the molded product is stably obtained without the above defects depending on the part. In addition, when the above ranges are not satisfied at the same time, the flowability of the melt is not good, so the injection molding speed cannot be increased, and various types of molding defects such as insufficient filling (short shots), black streaks, cracks, flow marks, flash, and jetting always or frequently occur. In addition, it is difficult to produce stably because the injection molding machine must be changed or a large number of optimization processes are required depending on the part.

[0071] Therefore, in the present invention, the melting index and melting index ratio may be expressed in the following ranges, but are not limited thereto.

[0072] Advantageously, the above-mentioned eco-friendly resin composition provides an eco-friendly resin composition for injection molded automobile interior parts, wherein the melting index at 230°C, 2.16 kg load is MI2.16, and the melting index at 230°C, 5.0 kg load is MI5.0, and the MI2.16 is 3.0 to 120 g / 10 min, and the melting index ratio (MI5.0 / MI2.16) is 1.5 to 10.0.

[0073] More preferably, the above-mentioned eco-friendly resin composition provides an eco-friendly resin composition for injection molded automobile interior parts, wherein the melting index at 230°C, 2.16 kg load is MI2.16, and the melting index at 230°C, 5.0 kg load is MI5.0, and the MI2.16 is 10 to 100 g / 10 min, and the melting index ratio (MI5.0 / MI2.16) is 2.0 to 8.0.

[0074] Very preferably, the above-mentioned eco-friendly resin composition provides an eco-friendly resin composition for injection molded automobile interior parts, wherein the melting index at 230°C, 2.16 kg load is MI2.16, and the melting index at 230°C, 5.0 kg load is MI5.0, and the MI2.16 is 20 to 70 g / 10 min, and the melting index ratio (MI5.0 / MI2.16) is 3.0 to 7.0.

[0075] In one aspect of the present invention, the recycled resin pellet derived from high-density polyethylene waste refers to a pellet-shaped product obtained by crushing and melting and extruding waste products made of high-density polyethylene material that have been discarded after use, such as films, bottles, pallets, transport boxes, pipes, etc. made of high-density polyethylene material.

[0076] In one aspect of the present invention, the polypropylene refers to at least one selected from the group consisting of polypropylene homopolymer, polypropylene random copolymer, and polypropylene block copolymer.

[0077] One embodiment of the present invention may further include a crystal nucleating agent in the eco-friendly resin composition. When the crystal nucleating agent is further included, moldability becomes more stable and physical properties such as elastic modulus are further improved, as confirmed in Example 13 of Table 7.

[0078] The above crystal nucleating agent is at least one selected from the group consisting of sorbitol-based crystal nucleating agents such as benzylidene sorbitol, dibenzylidene sorbitol, methylbenzylidene sorbitol, ethylbenzylidene sorbitol, and 3,4-dimethylbenzylidene sorbitol; nonitol-based crystal nucleating agents such as 1,2,3-trideoxy-4,6:5,7-bis-O-[(4-propylphenyl)methylene]-nonitol; organic acid-based crystal nucleating agents such as heptane-2,3-dicarboxylic acid disodium salt, 1,2-cyclohexanedicarboxylic acid calcium salt, zinc stearate, and sodium benzoate salt; phenol-based crystal nucleating agents such as phenolphthalein; and phosphate ester-based crystal nucleating agents.

[0079] The above crystal nucleating agent can dramatically improve and excellently express the mechanical properties of a composition including a recycled resin derived from high-density polyethylene waste, and when injection molding using the above composition, the defect rate can be eliminated, and the sensitivity to machine type or processing equipment variables can be reduced, so that injection molded products can be stably manufactured. Examples of the crystal nucleating agent include, but are not limited to, Millad 3988 (sorbitol acetal) from Milliken, Millad NX8000 (nonitol acetal), Hyperform HPN-68L (heptane-2,3-dicarboxylic acid disodium salt 1,2-cyclohexanedicarboxylic acid calcium salt), Hyperform HPN-20E (1,2-cyclohexanedicarboxylic acid calcium salt / stearate zinc salt (=66 / 34) mixture), and ADK STAB NA-27 (phosphate ester compound) from ADEKA, Japan.

[0080] The content of the above crystal nucleating agent is not particularly limited, but for example, 0.001 to 5.0 parts by weight, 0.005 to 4.0 parts by weight, 0.1 to 3 parts by weight, or 0.5 to 2 parts by weight can be used with respect to 100 parts by weight of recycled resin pellets derived from high-density polyethylene waste contained in the eco-friendly resin composition. When the amount of crystal nucleating agent added is within the above range, mechanical properties such as elastic modulus are improved, and molding stability and product uniformity can be significantly improved.

[0081] One aspect of the present invention may further include an inorganic deodorant in the eco-friendly resin composition.

[0082] The above inorganic deodorant is at least one selected from the group consisting of porous active catalyst ceramic particles, porous zeolite particles, porous silica aerogel particles, and porous calcium silicate particles, among which porous active catalyst ceramic particles are preferred, but are not limited thereto. The above inorganic deodorant may have an average particle diameter of 0.1 to 5 ㎛, 0.1 to 3 ㎛, or 0.1 to 2.2 ㎛, but is not limited thereto.

[0083] Typically, recycled resins derived from high-density polyethylene waste often have a foul odor, making them very difficult to apply to the automotive industry, which thoroughly evaluates and manages the odor and volatile organic compound (VOC) emissions of materials or parts.

[0084] Although the evaluation methods for odor and VOCs are similar for each automobile manufacturer, the standards are different. For example, Hyundai-Kia Motors, a representative automobile manufacturer, classifies odor into 6 grades according to the MS300-34 standard, and grades 1 to 3 are judged as passing. In addition, VOCs are evaluated based on the emission amount (μg / m) of 8 components: benzene, toluene, ethylbenzene, xylene, styrene, formaldehyde, acetaldehyde, and achlorane according to the MS300-34 (material) and MS300-55 (part) standards. 3 ) and only those that are all within the management values ​​for each compound are judged as passing. Based on the above criteria, there is a risk that the recycled resin derived from high-density polyethylene waste will be judged as failing, and therefore the inorganic deodorant of the present invention can be a powerful solution.

[0085] The above porous active catalyst ceramic particles are particles in which an active catalyst component is supported on a porous ceramic carrier, and can more effectively remove odor-causing factors by adsorbing low-molecular substances and impurities and then decomposing them with the supported active catalyst. Examples of the above porous active catalyst ceramic particles include, but are not limited to, KESMON (average particle size 0.1 to 3.0 μm) manufactured by Dongwha Synthetic Co., Ltd. in Japan, and SmellCut (average particle size 0.5 to 2.0 μm) manufactured by Shin-A Chemical Co., Ltd.

[0086] The content of the above-mentioned inorganic deodorant is preferably 0.1 to 10 parts by weight, or 0.5 to 8 parts by weight, per 100 parts by weight of the recycled resin derived from high-density polyethylene waste contained in the eco-friendly resin composition. The inorganic deodorant may be added as is, but it may be preferred in terms of quality uniformity to manufacture it in the form of a masterbatch using polyethylene or polypropylene as a carrier resin and then add it.

[0087] In one aspect of the present invention, the eco-friendly resin composition may further contain a polyolefin-based elastomer as needed.

[0088] The above polyolefin-based elastomer is very effective in improving the impact resistance of the eco-friendly resin composition, but if too much is used, there is a problem of the flexural modulus decreasing, so it is necessary to add an appropriate amount. The polyolefin elastomer may include, but is not limited to, a polyethylene-based elastomer, a polypropylene-based elastomer, an ethylene-propylene copolymer-based elastomer, and the like. The content of the polyolefin-based elastomer may be added to the eco-friendly resin composition in an amount of 0.01 to 20 wt%, 0.1 to 10 wt%, 2 to 10 wt%, or 5 to 7 wt%, but is not limited thereto.

[0089] In one aspect of the present invention, the eco-friendly resin composition may further contain inorganic particles as needed.

[0090] The inorganic particles may be, for example, one or a mixture of two or more selected from the group consisting of talc, calcium carbonate, minerals, glass fiber, clay, kaolin, silica, diatomaceous earth, magnesium carbonate, calcium chloride, calcium sulfate, aluminum hydroxide, zinc oxide, magnesium hydroxide, titanium oxide, alumina, mica, asbestos powder, zeolite, silicate clay, boehmite, etc. For example, talc is preferable in that it is inexpensive and can significantly improve mechanical and thermal properties, but is not limited thereto. The content of the inorganic particles may be, but is not limited to, 0.01 to 50 wt%, 1 to 50 wt%, or 10 to 50 wt% based on 100 wt% of the eco-friendly resin composition. The above inorganic particles may have an average particle diameter of 0.1 to 5 ㎛, 0.1 to 3 ㎛, or 0.1 to 2 ㎛, but are not limited thereto. The inorganic particles may be introduced as is, but it is better in terms of quality uniformity to manufacture and introduce them in the form of a masterbatch using polyethylene or polypropylene as a carrier resin.

[0091] In one aspect of the present invention, the eco-friendly resin composition may further contain a polymer-based compatibilizer as needed.

[0092] The above polymer-based compatibilizer is very effective in improving the mechanical properties by improving the compatibility between the recycled resin derived from high-density polyethylene waste and the virgin polypropylene resin, but if too much is used, there is a problem of the flexural modulus decreasing, so it is necessary to add an appropriate amount. The above polymer-based compatibilizer may include, but is not limited to, an ethylene-based olefin block copolymer, an ethylene-propylene elastomer, an ethylene-propylene-diene copolymer, an ethylene-vinylacetate copolymer, a styrene block copolymer, and a styrene-ethylene-butylene-styrene copolymer. The content of the polymer-based compatibilizer may be added to the eco-friendly resin composition in an amount of, but is not limited to, 0.01 to 10 wt%, 0.1 to 10 wt%, 2 to 10 wt%, or 2 to 7 wt%.

[0093] In one aspect of the present invention, the eco-friendly resin composition for an injection-molded automobile interior part may further comprise recycled resin pellets derived from polypropylene waste in the eco-friendly resin composition. If it is difficult to increase the recycled resin content with only recycled resin pellets derived from high-density polyethylene waste, recycled resin pellets derived from polypropylene waste may be further comprised for the purpose of increasing the recycled resin content in the eco-friendly composition. However, even when the eco-friendly resin composition further comprises recycled resin pellets derived from polypropylene waste, the resulting eco-friendly resin composition must satisfy the conditions of having an MI2.16 of 3.0 to 120 g / 10 min and a melt index ratio (MI5.0 / MI2.16) of 1.5 to 10.0.

[0094] In one embodiment of the present invention, the eco-friendly resin composition may further contain conventional additives, for example, any one selected from pigments, heat stabilizers, UV stabilizers, lubricants, processing aids, and dispersants, or a mixture thereof. The additives are preferably used within a range that does not deteriorate the physical properties and appearance characteristics of the eco-friendly resin composition, and may be added to the resin composition in an amount of 0.001 to 3 wt%, but are not limited thereto.

[0095] Recently, in Europe, along with regulations mandating the use of recycled resin, there is a demand for a simple method to recognize the amount of recycled resin used.

[0096] As a solution to this, one aspect of the present invention may be a resin composition for an injection-molded automobile interior material, wherein the colors of the high-density polyethylene waste-derived recycled resin pellets and the pellets of the remaining components are different from each other, and are dry-blended. Here, the pellets of the remaining components may further include at least one selected from polypropylene virgin resin pellets, masterbatch pellets containing a crystal nucleating agent, masterbatch pellets containing an inorganic deodorant, thermoplastic elastomer pellets, masterbatch pellets containing inorganic particles, and polymer compatibilizer pellets.

[0097] As one embodiment, FIGS. 1 and 2 show that the content of recycled resin can be recognized very simply and easily by the color difference between the pellets of recycled resin derived from high-density polyethylene waste and the pellets of the remaining components.

[0098] The pellets of the above-described other components can be conveniently made into a single pellet by gathering desired components. For example, as can be seen in the appearance of two types of pellets, namely, a white-colored polyethylene recycled resin pellet (11) and a dark brown-colored resin composition pellet (12) in which pellets of further included components are dry-blended, the recycled resin content can be easily and simply recognized by the color difference.

[0099] In addition, the pellets of the other components mentioned above may be composed of two or more pellets to take advantage of the characteristics of the components, and the color of the pellets of the remaining components may be any color as long as they are different from the color of the recycled resin pellets derived from high-density polyethylene waste and can be distinguished with the naked eye. For example, as can be seen in the appearance of the resin composition pellets (20) in which four kinds of pellets are dry-blended: white-colored high-density polyethylene waste-derived recycled resin pellets (21), natural-colored polypropylene virgin resin pellets (22), gray-colored pellets of further included components obtained by melt-extruding a mixture of a crystal nucleating agent, inorganic particles, a polymer-based compatibilizer, an inorganic deodorant, and a polyolefin elastomer, and a dark brown pigment masterbatch (24) using polypropylene virgin resin as a carrier resin, even if the resin composition pellets exist in the form of a mixture of pellets of various colors, if the color of the high-density polyethylene waste-derived recycled resin pellets and the color of the further included component pellets are different, the recycled resin content can be recognized very simply and easily.

[0100] In the present invention, the color of the high-density polyethylene waste-derived recycled resin pellets or pellets of the remaining components can be imparted by adding a certain amount of pigment or dye.

[0101] Examples of the pigments include organic pigments such as carbon black, graphite, inactive azo pigments, activated azo pigments, copper phthalocyanine pigments, lake pigments, quinatoridone pigments, dioxazine pigments, and condensed azo pigments; inorganic pigments such as titanium oxide, titanium yellow, chromium oxide, yellow lead, calcium carbonate, barium sulfate, magnesium carbonate, and aluminum oxide; and dyes such as oil-soluble dyes and dispersible dyes. It is preferable to use the pigments in a range that does not deteriorate the physical properties and appearance characteristics of the resin composition, and may be added to the resin composition in an amount of 0.001 to 5 wt%, but is not limited thereto.

[0102] In one embodiment of the present invention, the content of the recycled resin derived from high-density polyethylene waste in the eco-friendly resin composition may be 5 to 50 wt%, preferably 10 to 40 wt%, and more preferably 15 to 35 wt%, but the content is not limited. If the content of the recycled resin derived from high-density polyethylene waste is less than 5 wt%, the carbon-neutral eco-friendliness due to the use of the recycled resin may be insufficient, and if it exceeds 50 wt%, it may be difficult to secure excellent moldability due to the difference in melt index.

[0103] The present invention may be an injection molded automobile interior material obtained by injection molding using the above eco-friendly resin composition, and specifically may be a door trim, an instrument panel, a dashboard, a pillar trim, a console, air ventilation, a luggage side trim, a package tray, a side member, etc.

[0104] In addition, the present invention may be an automobile interior injection molded product having a flexural modulus of 1,000 MPa or more, 1200 MPa or more, or 1400 MPa or more. In addition, the IZOD impact strength (23°C) may be 20 kg·cm / cm or more, 25 kg·cm / cm or more, or 30 kg·cm / cm or more. In addition, the automobile interior hollow molded product may have an odor grade of 1 to 3 or lower according to the Hyundai-Kia Motors standard MS300-34.

[0105] Below, examples are provided to specifically illustrate the present invention, but the present invention is not limited to these examples. Furthermore, measurements in the following examples and comparative examples were conducted as follows.

[0106] (1) Melting index (MI) and melting index ratio (MI5.0 / MI2.16)

[0107] The melting index MI2.16 at 230℃ and 2.16kg load of the resin composition and the melting index MI5.0 at 230℃ and 5.0kg load of the resin composition were measured according to ASTM D1238, and the melting index ratio (MI5.0 / MI2.16) was obtained from these.

[0108] (2) Formability

[0109] The moldability was evaluated into 5 grades as shown in Table 1 according to the level of occurrence of molding defects such as insufficient filling (non-molding), black lines, cracks, flow marks, flash, and jetting that may occur during injection molding of resin composition specimens.

[0110] Classification ◎◎(Extremely good)◎(Excellent)○(Good)△(Average)X(Poor)Defective molding degreeNoneExtremely minimalAlmost noneSomewhat very severe

[0111] (3) Flexural modulus

[0112] As one of the measures of mechanical properties, the flexural modulus (MPa) was measured according to ASTM D790 and evaluated into 5 grades as shown in Table 2.

[0113] Classification ◎◎(Extremely good) ◎(Excellent) ○(Good) △(Average) X(Poor) Flexural modulus (MPa) 1,400 or more 1,200 or more less than 1,400 1,000 or more less than 1,200 700 or more less than 1,000 Less than 700

[0114] (4) 23℃ IZOD impact strength As one of the scales of mechanical properties, 23℃ IZOD impact strength (Kg·cm / cm) was measured according to ASTM D256 and evaluated into 5 grades as shown in Table 3.

[0115] Classification ◎◎(Extremely good) ◎(Excellent) ○(Good) △(Average) X(Poor) 23℃ IZOD Impact strength (Kg·cm / cm) 30 or more 25 or more less than 30 20 or more less than 25 15 or more less than 20 Less than 15

[0116] (5) As one of the measures of odor deodorization, the degree of odor generation for injection-molded specimens was evaluated into 6 grades as shown in Table 4 based on the Hyundai-Kia Motors standard MS300-34. Grades 1 to 3 were judged as ‘suitable’, and grades 4 to 6 were judged as ‘unsuitable’.

[0117] Grade Odor Occurrence Level 1 No Odor 2 Cannot tell what it is, but can feel the smell 3 Weakly detectable odor, but can tell what it is 4 Easily detectable odor 5 Very strong odor 6 Intense odor that is difficult to tolerate and causes breathing difficulties

[0118] (6) As one of the measures of VOC deodorization, the level of VOCs generation in injection-molded specimens was evaluated according to the criteria in Table 5 based on the Hyundai-Kia Motors standard MS300-55. When all criteria for VOCs were passed, it was judged as ‘suitable.’

[0119] VOCs unit standard benzene μg / m 2 Toluene below 30 μg / m 2 Less than 1,000 μg / m of ethylbenzene 2 Less than 1,000 μg / m 2 870 or less styrene μg / m 2 220 or less formaldehyde μg / m 2 210 or less acetaldehyde μg / m 2 300 or less achlorane μg / m 2 50 or less

[0120] (7) Awareness of recycled resin content

[0121] A 300g pellet sample of the resin composition was collected and classified by pellet color. If the content of recycled resin derived from high-density polyethylene waste could be visually recognized, it was judged as 'suitable'; otherwise, it was judged as 'unsuitable'.

[0122] [Example 1]

[0123] High-density polyethylene shopping bags, delivery bags, etc. are separated and collected by a recycling company and processed through a melt extrusion process to obtain MI2.16 of 0.08 g / 10min, MI5.0 of 1.6 g / 10min, MI5.0 / MI2.16 of 20, and density of 0.960 g / cm. 3 High-density polyethylene recycled resin pellets (RPE-A) were prepared. MI2.16 was 10 g / 10 min, MI5.0 was 17.2 g / 10 min, MI5.0 / MI2.16 was 1.72, and density was 0.9 g / cm 3 Polypropylene new resin pellets (Daehan Yuhwa 4017, PP-A) were prepared. A dark brown pigment masterbatch (CM) using the PP-A as a carrier resin was prepared.

[0124] A resin composition was prepared by melt extrusion in a twin-screw extruder with the mixing ratio shown in Table 6. The MI2.16 and MI5.0 of the obtained resin composition were measured, and the melt index ratio (MI5.0 / MI2.16) was obtained from these measurements. In addition, the flexural modulus and IZOD impact strength were measured, and the results are shown in Table 7.

[0125] In addition, the injection moldability of the obtained resin composition was evaluated in an injection molding machine, and the results are shown in Table 7.

[0126] [Example 2]

[0127] The recycling company collects, crushes, washes and dries high-density polyethylene water pipes and processes them through a melt extrusion process to produce pipes with MI2.16 of 0.07 g / 10 min, MI5.0 of 20.4 g / 10 min, M5.0 / M2.16 of 291.4, and density of 0.961 g / cm. 3 High-density polyethylene recycled resin pellets (RPE-B) were prepared. MI2.16 was 20 g / 10 min, MI5.0 was 40.4 g / 10 min, MI5.0 / MI2.16 was 2.02, and density was 0.9 g / cm 3Polypropylene new resin pellets (Hanwha Total BI6300, PP-B) were prepared. The same procedure as Example 1 was followed, except that the composition ratio was changed to that shown in Table 6, and the results are shown in Table 7.

[0128] [Example 3]

[0129] The recycling company separates, collects, crushes, washes and dries high-density polyethylene milk bottles and processes them through a melt extrusion process to obtain MI2.16 of 0.7 g / 10 min, MI5.0 of 22.4 g / 10 min, MI5.0 / MI2.16 of 32.0, and density of 0.957 g / cm. 3 High-density polyethylene recycled resin pellets (RPE-C) were prepared. MI2.16 was 33 g / 10 min, MI5.0 was 81.8 g / 10 min, MI5.0 / MI2.16 was 2.48, and the density was 0.9 g / cm 3 Polypropylene new resin pellets (Lotte Chemical J-370, PP-C) were prepared. The same procedure as Example 1 was followed except that the composition ratio was changed to that shown in Table 6, and the results are shown in Table 7.

[0130] [Example 4]

[0131] The recycling company collects, crushes, washes, and dries mixed waste materials such as milk bottles, shampoo bottles, and motor oil bottles made of high-density polyethylene, and processes them through a melt extrusion process to produce a MI2.16 of 0.62 g / 10 min, MI5.0 of 25.9 g / 10 min, MI5.0 / M2.16 of 41.8, and a density of 0.955 g / cm. 3 High-density polyethylene recycled resin pellets (RPE-D) were prepared. MI2.16 was 60 g / 10 min, MI5.0 was 181 g / 10 min, MI5.0 / MI2.16 was 3.02, and the density was 0.9 g / cm 3Polypropylene new resin pellets (SK Geocentric B393G, PP-D) were prepared. The same procedure as Example 1 was followed except that the composition ratio was changed to that shown in Table 6, and the results are shown in Table 7.

[0132] [Example 5]

[0133] A recycling resin company collects, crushes, washes, and dries waste mixed with high-density polyethylene material such as cans, distilled water bottles, and pill bottles, and through a melt extrusion process, produces a MI2.16 of 0.93 g / 10 min, MI5.0 of 366.0 g / 10 min, MI5.0 / MI2.16 of 393.5, and a density of 0.952 g / cm. 3 High-density polyethylene recycled resin pellets (RPE-E) were prepared. The same procedure as Example 1 was followed, except that the composition ratio was changed to that described in Table 6, and the results are shown in Table 7.

[0134] [Example 6]

[0135] The recycling company collects, crushes, washes, and dries waste materials such as water pipes, gas pipes, shampoo bottles, and motor oil bottles made of high-density polyethylene, and through the melt extrusion process, produces waste products with MI2.16 of 0.44 g / 10 min, MI5.0 of 133.3 g / 10 min, MI5.0 / MI2.16 of 303.0, and density of 0.955 g / cm. 3 High-density polyethylene recycled resin pellets (RPE-F) were prepared. MI2.16 was 80 g / 10 min, MI5.0 was 462 g / 10 min, MI5.0 / MI2.16 was 5.78, and the density was 0.9 g / cm 3 Polypropylene new resin pellets (Lotte Chemical JM390, PP-E) were prepared. In addition, the same procedure as Example 1 was performed except that the composition ratio was changed to that described in Table 6, and the results are shown in Table 7.

[0136] [Example 7]

[0137] The recycling company collects, crushes, washes and dries high-density polyethylene pallets, transport boxes, shampoo bottles, etc. and processes them through a melt extrusion process to produce MI2.16 of 5.5 g / 10 min, MI5.0 of 774.0 g / 10 min, MI5.0 / MI2.16 of 140.7, and density of 0.955 g / cm. 3 High-density polyethylene recycled resin pellets (RPE-G) were prepared. MI2.16 was 110 g / 10 min, MI5.0 was 532 g / 10 min, MI5.0 / MI2.16 was 4.84, and the density was 0.9 g / cm 3 Polypropylene new resin pellets (Lotte Chemical JSS-395N, PP-F) were prepared. In addition, the same procedure as Example 1 was performed except that the composition ratio was changed to that described in Table 6, and the results are shown in Table 7.

[0138] [Example 8]

[0139] MI2.16 is 130 g / 10min, MI5.0 is 930 g / 10min, MI5.0 / MI2.16 is 7.15, and density is 0.905 g / cm 3 Polypropylene new resin pellets (TotalEnergies, PCC14642, PP-G) were prepared. The same procedure as Example 1 was followed except that the composition ratio was changed to that shown in Table 6, and the results are shown in Table 7.

[0140] [Example 9]

[0141] The recycling company collects, crushes, washes, and dries waste mixed with high-density polyethylene material such as sewage pipes, wire pipes, detergent bottles, and shampoo bottles, and through the melt extrusion process, produces waste with MI2.16 of 0.35 g / 10 min, MI5.0 of 62.7 g / 10 min, MI5.0 / MI2.16 of 179, and density of 0.952 g / cm. 3High-density polyethylene recycled resin pellets (RPE-H) were prepared. Sorbitol acetal (Milliken Millad 3988, NA-A) was prepared as a crystal nucleating agent. The same procedure as Example 1 was followed except that the composition ratio was changed to that shown in Table 6, and the results are shown in Table 7.

[0142] [Example 10]

[0143] Talc (Mondo Minerals, Microtalc FC8, Talc) with an average particle size of 2.2 μm was prepared as inorganic particles. The same procedure as Example 1 was followed except that the composition ratio was changed to that shown in Table 6, and the results are shown in Table 7.

[0144] [Example 11]

[0145] MI2.16 is 95 g / 10min, MI5.0 is 382 g / 10min, MI5.0 / MI2.16 is 4.02, and density is 0.9 g / cm 3 Polypropylene new resin pellets (Lotte Chemical J-395, PP-H) were prepared. As a polymer compatibilizer, MI2.16 was 7.3 g / 10 min, MI5.0 was 241 g / 10 min, MI5.0 / MI2.16 was 33, and density was 0.866 g / cm 3 An ethylene-based olefin block copolymer (DOW, Infuse 9507, PC-A) was prepared. The same procedure as in Example 1 was followed, except that the composition ratio was changed to that shown in Table 6, and the results are shown in Table 7.

[0146] [Example 12]

[0147] Example 1 was performed in the same manner as Example 1 except that the composition ratio was changed to that described in Table 6, and the results are shown in Table 7.

[0148] [Example 13]

[0149] Example 6 was performed in the same manner as in Table 6, except that the composition and composition ratio were changed as described in Table 6. The results are shown in Table 7.

[0150] [Comparative Example 1]

[0151] MI2.16 is 4.0 g / 10min, MI5.0 is 22.7 g / 10min, MI5.0 / MI2.16 is 5.7, and density is 0.9 g / cm 3 Polypropylene new resin pellets (Lotte Chemical J-330, PP-I) were prepared. The same procedure as Example 1 was followed except that the composition ratio was changed to that shown in Table 6, and the results are shown in Table 7.

[0152] [Comparative Example 2]

[0153] MI2.16 is 150 g / 10min, MI5.0 is 923.1 g / 10min, MI5.0 / MI2.16 is 6.15, and density is 0.905 g / cm 3 Polypropylene new resin pellets (TotalEnergies, MH150CN0, PP-J) were prepared. The same procedure as Example 1 was followed except that the composition ratio was changed to that shown in Table 6, and the results are shown in Table 7.

[0154] [Comparative Example 3]

[0155] The recycling company collects, crushes, washes, and dries waste mixed with high-density polyethylene plastic bags and secondary battery separators, and processes it through a melt extrusion process to produce a MI2.16 of 0.11 g / 10 min, a MI5.0 of 0.81 g / 10 min, a MI5.0 / MI2.16 of 7.4, and a density of 0.957 g / cm. 3 High-density polyethylene recycled resin pellets (RPE-I) were prepared. MI2.16 was 9.0 g / 10 min, MI5.0 was 12.1 g / 10 min, MI5.0 / MI2.16 was 1.3, and the density was 0.905 g / cm 3Polypropylene new resin pellets (GS Caltex, M548N, PP-K) were prepared. The same procedure as Example 1 was followed except that the composition ratio was changed to that shown in Table 6, and the results are shown in Table 7.

[0156] [Comparative Example 4]

[0157] The recycling company collects, crushes, washes and dries high-density polyethylene pallets and boxes, and through the melt extrusion process produces MI2.16 of 7.0 g / 10 min, MI5.0 of 687 g / 10 min, MI5.0 / MI2.16 of 98, and density of 0.961 g / cm. 3 High-density polyethylene recycled resin pellets (RPE-J) were prepared. MI2.16 was 110 g / 10 min, MI5.0 was 934 g / 10 min, MI5.0 / MI2.16 was 8.49, and density was 0.90 g / cm 3 Polypropylene new resin pellets (Lyondellbasell, EA5076, PP-L) were prepared. The same procedure as Example 1 was followed except that the composition ratio was changed to that shown in Table 6, and the results are shown in Table 7.

[0158] [Comparative Example 5]

[0159] MI2.16 is 5.0 g / 10min, MI5.0 is 72.0 g / 10min, MI5.0 / MI2.16 is 14.4, and density is 0.90 g / cm 3 Polypropylene new resin pellets (Hanwha Total, BJ300, PP-M) were prepared. The same procedure as Example 1 was followed, except that the composition ratio was changed to that shown in Table 6, and the results are shown in Table 7.

[0160] Classification High-density polyethylene waste-derived recycled resin pigment Polypropylene new resin crystal nucleating agent Inorganic particle Polymer-based compatibilizer Example 1 RPE-A 30 wt% CM1 wt% PP-A 69 wt% Example 2 RPE-B 25 wt% CM1 wt% PP-B 74 wt% Example 3 RPE-C 35 wt% CM1 wt% PP-C 64 wt% Example 4 RPE-D 45 wt% CM1 wt% PP-D 54 wt% Example 5 RPE-E 20 wt% CM1 wt% PP-D 79 wt% Example 6 RPE-F 15 wt% CM1 wt% PP-E 84 wt% Example 7 RPE-G 27 wt% CM1 wt% PP-F 72 wt% Example 8 RPE-F 5 wt% RPE-G 15 wt% CM1 %PP-G79 %wt Example 9RPE-D 30 %RPE-H 15 %CM1 %PP-D53.7 %NA-A0.3 %wt Example 10RPE-E 20 %CM1 %PP-D68.7 %NA-A0.3 %Talc10 %wt Example 11RPE-C 40 %CM1 %PP-H55.7 %NA-A0.3 %PC-A3 %wt Example 12RPE-F 35 %CM1 %PP-H45.7 %NA-A0.3 %Talc15 %PC-A3 %wt Example 13RPE-F 15 %CM1 %PP-E83.7 %NA-A0.3 %wt Comparative Example 1RPE-A 35 %CM1 %PP-I64 Weight % Comparative Example 2 RPE-G 15 wt% CM1 wt% PP-J84 wt% Comparative Example 3 RPE-I 20 wt% CM1 wt% PP-K79 wt% Comparative Example 4 RPE-J 45 wt% CM1 wt% PP-L54 wt% Comparative Example 5 RPE-A 45 wt% CM1 wt% PP-M54 wt%

[0161] Classification Melt index MI5.0 / MI2.16 Formability Mechanical properties MI2.16MI5.0 Flexural modulus IZOD Impact strength Example 16.9212.41.79○○○ Example 215.035.42.36○ ~ ◎○○ Example 321.761.02.81◎○ ~ ◎○ Example 433.3112.23.34◎◎○ ~ ◎○ Example 548.2218.34.53◎◎○ ~ ◎○ Example 668.1412.76.06◎○ ~ ◎○ Example 780.7592.37.34○ ~ ◎○○ Example 8103.5858.08.29○○○ Example 932.6115.13.53◎◎◎◎Example 1041.4197.54.77◎◎◎◎◎Example 1153.4220.14.12◎◎◎ ~ ◎◎◎ ~ ◎◎Example 1243.8228.55.22◎ ~ ◎◎◎◎◎ ~ ◎◎Example 1369.2430.76.22◎◎◎○Comparative Example 12.615.15.81△△XComparative Example 2127891.57.02△XXComparative Example 37.19.71.37XXXComparative Example 462.6813.813.0XXXComparative Example 52.840.314.4XXX

[0162] [Example 14]

[0163] A recycling resin company collects, crushes, washes, and dries waste mixed with high-density polyethylene water pipes, sewer pipes, and gas pipes, and through a melt extrusion process, produces MI2.16 of 0.07 g / 10 min, MI5.0 of 23.7 g / 10 min, MI5.0 / MI2.16 of 339, and density of 0.957 g / cm. 3 High-density polyethylene recycled resin pellets (RPE-K) were prepared. Nonitol acetal (Milliken Millad NX8000, NA-B) was prepared as a crystal nucleating agent, and porous active catalyst ceramic particles (Nippon Dowa Synthetic Co., Ltd., trade name: KESMON, PCP-A) with an average particle size of 1.2 μm were prepared as an inorganic deodorant. The same procedure as Example 1 was repeated except that the composition ratio was changed to that shown in Table 8 and the deodorizing properties were additionally evaluated, and the results are shown in Table 9.

[0164] [Example 15]

[0165] The recycling company collects, crushes, washes, and dries mixed waste such as high-density polyethylene bottles, detergent bottles, and shampoo bottles, and then processes them through a melt extrusion process to produce bottles with MI2.16 of 0.71 g / 10 min, MI5.0 of 81.6 g / 10 min, MI5.0 / MI2.16 of 115, and a density of 0.955 g / cm. 3 High-density polyethylene recycled resin pellets (RPE-L) were prepared. A mixture of 1,2-cyclohexanedicarboxylic acid calcium salt / zinc stearate (=66 / 34) (Milliken Hyperform HPN-20E, NA-C) was prepared as a crystal nucleating agent, and porous silica aerogel particles (JIOS Aerogel, trade name JIOS AeroVa, PCP-B) with an average particle size of 3.5 μm were prepared as an inorganic deodorant. As a polyolefin elastomer, MI2.16 was 0.1 g / 10 min, MI5.0 was 15.8 g / 10 min, MI5.0 / MI2.16 was 158, and the density was 0.868 g / cm 3 Polyethylene elastomer pellets (SK Geocentric, Solumer 871, PEE-A) were prepared. The same procedure as in Example 7 was followed except that the composition ratio was changed to that shown in Table 8, and the results are shown in Table 9.

[0166] Classification High-density polyethylene waste-derived recycled resin Pigment Polypropylene new resin Crystal nucleating agent Inorganic particle Polymer-based commercializing agent Inorganic deodorizing agent Polyolefin elastomer Example 14 RPE-K25 wt% CM1 wt% PP-E5 9.8 wt% NA-B0.2 wt% Talc10 wt% PC-A2 wt% PCP-A2 wt% - Example 15 RPE-L25 wt% CM1 wt% PP-G4 8.7 wt% NA-C0.3 wt% Talc15 wt% PC-A3 wt% PCP-B2 wt% PEE-A5 wt%

[0167] Melt index MI5.0 / MI2.16 Formability Mechanical properties Deodorization MI2.16MI5.0 Flexural modulus IZOD Impact strength Odor VOCs Example 1448.0287.05.98◎◎◎◎◎∼◎◎SuitableSuitable Example 1563.7481.37.56◎◎◎◎◎SuitableSuitable

[0168] [Example 16]

[0169] A recycling company collects, crushes, washes, and dries mixed waste materials such as milk bottles, water bottles, and makgeolli bottles made of high-density polyethylene. A white pigment masterbatch with high-density polyethylene as a carrier is added to the resulting crushed waste material, and then, through a melt extrusion process, a white-colored MI2.16 of 0.58 g / 10 min, MI5.0 of 76.3 g / 10 min, MI5.0 / MI2.16 of 132, and a density of 0.954 g / cm is produced. 3 High-density polyethylene recycled resin pellets (RPE-M) were prepared. Polypropylene virgin resin (PP-G), crystal nucleating agent (NA-C), inorganic particles (Talc), polymeric compatibilizer (PC-A), inorganic deodorant (PCP-B), polyolefin elastomer (PEE-A), and dark brown pigment masterbatch (CB-A) were extruded together in a twin-screw extruder in the mixing ratios shown in Table 10 to obtain dark brown-colored pellets containing more included components. The obtained white-colored high-density polyethylene waste-derived recycled resin pellets (11) and the dark brown-colored pellets containing more included components (12) were dry blended to obtain final resin composition pellets as shown in Fig. 1, and the same procedure as in Example 7 was performed except that the recognizability of the recycled resin content was additionally evaluated, and the results are shown in Table 9.

[0170] [Example 17]

[0171] White-colored high-density polyethylene recycled resin pellets (RPE-M), natural-colored polypropylene virgin resin (PP-F) pellets, and a dark brown pigment masterbatch (CB-A) were prepared. In addition, a mixture of a crystal nucleating agent (NA-C), inorganic particles (Talc), a polymer-based compatibilizer (PC-A), an inorganic deodorant (PCP-B), and a polyolefin elastomer (PEE-A) was extruded in a twin-screw extruder at the mixing ratios shown in Table 10 to obtain pellets containing additional components. As shown in Fig. 2, four kinds of pellets, including the white-colored high-density polyethylene waste-derived recycled resin pellets (21), polypropylene virgin resin (PP-F) pellets (22), pellets of further included components (23), and dark brown pigment masterbatch (CB-A) pellets (24), were dry blended to obtain final resin composition pellets (20), and the same procedure as Example 7 was followed, except that the recognizability of the recycled resin content was additionally evaluated, and the results are shown in Table 9.

[0172] Classification High-density polyethylene waste-derived recycled resin Pigment Polypropylene new resin Crystal nucleating agent Inorganic particle Polymer-based commercializing agent Inorganic deodorizing agent Polyolefin elastomer Example 16 RPE-M25 wt% CM1 wt% PP-D5 1.8 wt% NA-C0.2 wt% Talc15 wt% PC-A2 wt% PCP-B2 wt% PEE-A3 wt% Example 17 RPE-M23 wt% CM2 wt% PP-F4 7.8 wt% NA-C0.2 wt% Talc18 wt% PC-A3 wt% PCP-B2 wt% PEE-A4 wt%

[0173] Melt index MI5.0 / MI2.16 Formability Mechanical properties Deodorization Recycled resin content Perceptibility MI2.16MI5.0 Flexural modulus IZOD Impact strength Odor VOCs Example 1631.3118.13.77◎◎◎◎◎◎SuitableSuitableSuitable Example 1752.9258.74.89◎◎◎◎◎◎SuitableSuitable

[0174] [Example 18]

[0175] A waste shredder obtained by separating and collecting high-density polyethylene shopping bags, delivery bags, etc. from a recycling company is added with a titanium dioxide white pigment masterbatch using high-density polyethylene as a carrier, and then colored white through a melt extrusion process. MI2.16 is 0.08 g / 10 min, MI5.0 is 1.7 g / 10 min, MI5.0 / MI2.16 is 21, and density is 0.961 g / cm. 3 High-density polyethylene recycled resin pellets (RPE-O) were prepared. In addition, waste mixed with polypropylene-based danpla (plastic corrugated cardboard), general sheets, stationery sheets, packaging sheets, and vacuum forming sheets was collected, crushed, washed, and dried. A titanium dioxide white pigment masterbatch with polypropylene as a carrier was added to the resulting waste crushed product, and then, through a melt extrusion process, the product was colored white with MI2.16 of 0.85 g / 10 min, MI5.0 of 3.12 g / 10 min, MI5.0 / MI2.16 of 3.67, and a density of 0.91 g / cm. 3 Polypropylene recycled resin pellets (RPP-A) were prepared. Polypropylene virgin resin (PP-D), crystal nucleating agent (NA-C), inorganic particles (Talc), polymer compatibilizer (PC-A), inorganic deodorant (PCP-B), polyolefin elastomer (PEE-A), and dark brown pigment masterbatch (CB-A) were prepared and extruded together in a twin-screw extruder at the mixing ratios shown in Table 12 to obtain pellets of further included components colored dark brown. The obtained white-colored high-density polyethylene and polypropylene waste-derived recycled resin pellets and the dark brown-colored pellets of further included components were dry blended to obtain final resin composition pellets. The procedure of Example 7 was repeated except that the recognizability of the recycled resin content was additionally evaluated, and the results are shown in Table 13.

[0176] Classification High-density polyethylene waste-derived recycled resin Pigment Polypropylene virgin resin Polypropylene waste-derived recycled resin Crystal nucleating agent Inorganic particle Polymer-based commercializing agent Inorganic deodorizing agent Polyolefin elastomer Example 18 RPE-O40 wt% CM2 wt% PP-D22.8 wt% RPP-A15 wt% NA-C0.2 wt% Talc12 wt% PC-A2 wt% PCP-B3 wt% PEE-A3 wt%

[0177] Melt index MI5.0 / MI2.16 Formability Mechanical properties Deodorization Recycled resin content Perceptibility MI2.16MI5.0 Flexural modulus IZOD Impact strength Odor VOCs Example 1813.942.913.09◎◎◎◎◎◎SuitableSuitableSuitable

[0178] As can be seen from Examples 1 to 13, an eco-friendly resin composition comprising high-density polyethylene waste-derived recycled resin pellets and high-density polyethylene virgin resin pellets obtained by melt blending, when MI2.16 is 3 to 120 g / 10 min and melt index ratio (MI5.0 / MI2.16) is 1.5 to 10.0, has excellent hollow extrusion moldability and mechanical properties suitable for a hollow molded product for automobile interior materials. In Examples 1 to 8, when the formability and mechanical properties are compared, the melt index ratio (MI5.0 / MI2.16) is the most excellent in the range of 3.0 to 5.0 (Examples 4 and 5), the range of 2.5 to 3.0 (Example 3) or the range of 5.0 to 7.0 (Example 6) is next best, the range of 2.0 to 2.5 (Example 2) or the range of 7.0 to 8.0 (Example 7) is next best, and the range of 1.5 to 2.0 (Example 1) or the range of 8.0 to 10.0 (Example 8) is next best. As such, it can be seen that the formability and mechanical properties vary greatly depending on the melt index ratio (MI5.0 / MI2.16). In addition, as can be seen in Examples 9, 10, and 13, it can be seen that the flexural modulus is further improved in the case of a resin composition to which a crystal nucleating agent or inorganic particles are further added, and as can be seen in Examples 11 and 12, it can be seen that the flexural modulus and impact resistance are further improved in the case of a resin composition to which a polymer-based compatibilizer is further added. When a crystal nucleating agent is further added as in Example 13, not only the flexural modulus but also the formability is significantly improved compared to Example 1 of a similar composition. On the other hand, as can be seen in Comparative Examples 1 and 2, when the melt index ratio (MI5.0 / MI2.16) is in the range of 1.5 to 10.0 but MI2.16 is outside the range of 3 to 120 g / 10 min, or when MI2.16 is in the range of 3 to 120 g / 10 min but the melt index ratio (MI5.0 / MI2.16) is 1.5 to 10.When the MI2.16 is outside the range of 3 to 120 g / 10 min and the melt index ratio (MI5.0 / MI2.16) is outside the range of 1.5 to 10.0, as can be seen in Comparative Example 5, the injection moldability is poor and the product does not have mechanical properties suitable for an injection molded product for automobile interior materials.

[0179] As can be seen in Example 14, it can be seen that the deodorizing property is very excellent in the case of a resin composition to which an inorganic deodorant is further added, and as can be seen in Example 15, it can be seen that the deodorizing property and impact resistance are further excellent in the case of a resin composition to which an inorganic deodorant and a polyolefin elastomer are further added.

[0180] As can be seen in Examples 16 and 17, an eco-friendly resin composition comprising recycled resin pellets derived from high-density polyethylene waste and virgin polypropylene resin pellets obtained by dry blending has excellent injection moldability and excellent recycled resin content recognition when MI2.16 is 3 to 120 g / 10 min and melt index ratio (MI5.0 / MI2.16) is 1.5 to 10.0, and further, it can be seen that the flexural modulus, deodorization properties, and impact resistance are very excellent when a crystal nucleating agent, a polymer-based compatibilizer, an inorganic deodorant, and a polyolefin elastomer are further added.

[0181] As can be seen in Example 18, an eco-friendly resin composition comprising recycled resin pellets derived from high-density polyethylene and polypropylene waste obtained by dry blending and virgin polypropylene resin pellets, when MI2.16 is 3 to 120 g / 10 min and melt index ratio (MI5.0 / MI2.16) is 1.5 to 10.0, has excellent injection moldability and excellent recycled resin content recognition despite a very high recycled resin content, and also has excellent flexural modulus, deodorization, and impact resistance by further adding a crystal nucleating agent, a polymer-based compatibilizer, an inorganic deodorant, and a polyolefin elastomer.

[0182] As described above, the present invention has been described through specific matters and limited examples, but these are provided only to help a more general understanding of the present invention, and the present invention is not limited to the above examples, and those skilled in the art to which the present invention pertains can make various modifications and variations based on this description.

[0183] Therefore, the idea of ​​the present invention should not be limited to the described embodiments, and all things that are equivalent or equivalent to the claims described below as well as the claims are considered to fall within the scope of the idea of ​​the present invention.

[0184] This invention is a result of the following national research and development project.

[0185] ① Project Unique Number (Unique number assigned by NTIS): 2420006244

[0186] ② Assignment number (detailed assignment number): RS-2024-00508682

[0187] ③ Ministry name: Ministry of SMEs and Startups

[0188] ④ Research Management Specialist Agency: Small and Medium Business Technology Information Promotion Agency

[0189] ⑤ Research Project Name: Small and Medium Enterprise Technology Innovation Development Project (Scale-up Tips R&D)

[0190] ⑥ Research Project Name: Development of new eco-friendly PP materials using HDPE recycled resin with high recycled resin content for automotive interiors

[0191] ⑦ Host organization: Anychem Co., Ltd.

[0192] ⑧ Research Period: September 1, 2024 - August 31, 2027

Claims

1. An eco-friendly resin composition obtained by melt blending or dry blending and including high-density polyethylene waste-derived recycled resin pellets and polypropylene new resin pellets, An eco-friendly resin composition for injection molded automobile interior parts, wherein the melting index of the above eco-friendly resin composition at 230°C and a 2.16 kg load is MI2.16, and the melting index at 230°C and a 5.0 kg load is MI5.0, and the MI2.16 is 3.0 to 120 g / 10 min, and the melting index ratio (MI5.0 / MI2.16) is 1.5 to 10.

0.

2. In paragraph 1, The above high-density polyethylene waste-derived recycled resin pellets are an eco-friendly resin composition for injection-molded automobile interior parts, which are pellets obtained by crushing and melting and extruding one or more waste materials selected from the group consisting of films, bottles, pallets, transport boxes, and pipes made of high-density polyethylene material discarded after use.

3. In paragraph 1, The above polypropylene is an eco-friendly resin composition for injection molded automobile interior parts, wherein at least one polypropylene is selected from the group consisting of polypropylene homopolymer, polypropylene random copolymer, and polypropylene block copolymer.

4. In paragraph 1, An eco-friendly resin composition for injection molded automobile interior parts, wherein the eco-friendly resin composition further contains a crystal nucleating agent.

5. In paragraph 4, An eco-friendly resin composition for injection molded automobile interior parts, wherein the crystal nucleating agent is one or a mixture of two or more selected from the group consisting of a sorbitol-based crystal nucleating agent, a nonitol-based crystal nucleating agent, an organic acid-based crystal nucleating agent, a phenol-based crystal nucleating agent, and a phosphate ester-based crystal nucleating agent.

6. In paragraph 1, The above eco-friendly resin composition is an eco-friendly resin composition for injection molded automobile interior parts, which further contains an inorganic deodorant.

7. In paragraph 6, The above-mentioned inorganic deodorant is an eco-friendly resin composition for injection molded automobile interior parts, which is a mixture of one or two or more selected from the group consisting of porous active catalyst ceramic particles, porous zeolite particles, porous silica aerogel particles, and porous calcium silicate particles.

8. In paragraph 1, The above eco-friendly resin composition is an eco-friendly resin composition for injection molded automobile interior parts, which further contains a polyolefin-based elastomer.

9. In paragraph 8, The above polyolefin-based elastomer is an eco-friendly resin composition for injection molded automobile interior parts, wherein the composition comprises one or more selected from the group consisting of a polyethylene-based elastomer, a polypropylene-based elastomer, and an ethylene-propylene copolymer-based elastomer.

10. In paragraph 1, The above eco-friendly resin composition further contains inorganic particles, and is an eco-friendly resin composition for injection molding automotive interior parts.

11. In paragraph 10, An eco-friendly resin composition for injection molded automobile interior parts, wherein the above-mentioned inorganic particles are one or more selected from the group consisting of talc, calcium carbonate, minerals, glass fiber, clay, kaolin, silica, diatomaceous earth, magnesium carbonate, calcium chloride, calcium sulfate, aluminum hydroxide, zinc oxide, magnesium hydroxide, titanium oxide, alumina, mica, asbestos powder, silica clay, and boehmite.

12. In paragraph 1, The above eco-friendly resin composition further comprises a polymer-based commercializing agent, and is an eco-friendly resin composition for injection molding automotive interior parts.

13. In paragraph 12, The above polymer-based compatibilizer is an eco-friendly resin composition for injection molded automobile interior parts, which is a mixture of one or more selected from the group consisting of an ethylene-based olefin block copolymer, an ethylene-propylene-diene copolymer, an ethylene-vinylacetate copolymer, a styrene block copolymer, and a styrene-ethylene-butylene-styrene copolymer.

14. In paragraph 1, The above eco-friendly resin composition is an eco-friendly resin composition for injection molded automobile interior parts, which further contains recycled resin pellets derived from polypropylene waste.

15. In paragraph 1, The above eco-friendly resin composition further comprises at least one selected from a heat stabilizer, an ultraviolet stabilizer, an activator, a processing aid, a dispersant, and a pigment.

16. In paragraph 1, An eco-friendly resin composition for injection molded automobile interior parts, wherein the pellets of the recycled resin derived from the above high-density polyethylene waste and the pellets of the remaining components have different colors, and are dry-blended.

17. In paragraph 16, An eco-friendly resin composition for an injection-molded automobile interior part, wherein the pellets of the remaining components further include at least one selected from polypropylene virgin resin pellets, masterbatch pellets containing a crystal nucleating agent, masterbatch pellets containing an inorganic deodorant, polyolefin elastomer pellets, masterbatch pellets containing inorganic particles, and polymer-based compatibilizer pellets.

18. In paragraph 1, The above eco-friendly resin composition is an eco-friendly resin composition for injection molded automobile interior parts, containing 5 to 50 wt% of recycled resin pellets derived from high-density polyethylene waste.

19. An injection-molded automobile interior material product comprising an eco-friendly resin composition selected from any one of clauses 1 to 18.

20. In paragraph 19, An injection molded automobile interior material product having a flexural modulus of 1,000 MPa or more, an IZOD impact strength (23℃) of 20 kg·cm / cm or more, and an odor grade of 1 to 3 according to the Hyundai-Kia Motors standard MS300-34.

21. In paragraph 19, An injection molded automobile interior material product, wherein the injection molded product is any one selected from the group consisting of a door trim, an instrument panel, a dashboard, a pillar trim, a console, a luggage side trim, a package tray, a seat back board, an arm rest board, a heater case, a table gate trim, a sun visor, and a glove box.

Images