KR102646103B1 - Composition for vehicle interior material and molded product using the same - Google Patents

Abstract

The present invention relates to 10 to 20% by weight of a first polypropylene having a first melt index; 20 to 30% by weight of a second polypropylene having a second melt index; 30 to 50% by weight of a third polypropylene having a third melt index; 5 to 10% by weight recycled polyolefin material recovered from waste plastic materials; 1 to 10% by weight of rubber material; and 1 to 10% by weight of an inorganic filler, wherein the first melt index, second melt index and third melt index satisfy the relationship of first melt index < third melt index < second melt index. It relates to compositions and molded articles using the same. According to an embodiment of the present invention, the mechanical, physical and chemical properties required in the automobile interior materials industry can be stably exhibited while using recycled materials.

Description

Composition for automobile interior materials and molded products using the same {COMPOSITION FOR VEHICLE INTERIOR MATERIAL AND MOLDED PRODUCT USING THE SAME}

The present invention relates to a composition for automobile interior materials and a molded product using the same. More specifically, a composition for automobile interior materials and a molded product using the same that can stably secure the physical properties required for automobile interior materials while increasing eco-friendliness by recycling waste resources. It's about.

Global efforts are being made to reduce carbon dioxide related to global warming, and as part of this, countries in Asia and the European Union have announced plans to significantly reduce or stop production of internal combustion engine vehicles after 2025. In Korea, efforts are being made at the national level to reduce greenhouse gases, and much effort is being made to develop eco-friendly plastic materials.

As interest in the eco-friendly automobile industry increases, research and development is being conducted to increase eco-friendliness not only in fuel but also in automobile interior, parts, and materials. Major domestic and foreign automobile companies are strengthening technological development in various areas such as materials and processing techniques, and various research and development efforts to practice resource circulation by using eco-friendly materials such as natural raw materials and recycled materials are increasing.

Representative examples of recycled materials considering eco-friendliness are materials derived from various plastic materials. In particular, polyolefins such as polyethylene or polypropylene are widely applied in various fields such as food, textiles, automobile parts, and packaging materials for various products, and various developments have been made taking into account the environmental impact in relation to disposal, collection, and recycling. I'm losing.

However, recycled polyolefin has lower rigidity, impact strength, and mechanical properties compared to virgin materials, and has poor performance in terms of odor or appearance contamination, so it does not meet the physical property conditions required for application to automobile parts or household items. There is a problem that material selection is limited. Additionally, recycled polyolefin materials can typically be cross-contaminated with non-polyolefin materials such as polyethylene terephthalate, polyamide, polystyrene, or non-polymeric materials such as wood, paper, glass or aluminum. These additional impurities act as a factor that makes the compatibility of recycled polyolefin poor. Therefore, in order to improve the properties of recycled polyolefin materials, research is being conducted on combination with virgin polyolefin materials or application of additives such as various compatibilizers and coupling agents.

Patent Document 1 relates to a recycled polypropylene-rich polyolefin material, comprising: 80 to 97% by weight of a blend (A) containing polypropylene and polyethylene in a ratio of 9:1 to 13:7 as a recycled material recovered from waste plastic materials; and 3 to 20% by weight of a compatibilizer (B), which is a heterophasic random copolymer comprising a random polypropylene copolymer matrix phase and an elastomer phase dispersed therein.

Patent Document 2 relates to a recycled polyethylene-polypropylene blend containing a compatibilizer, 3:7 to 7: Disclosed is a polyethylene-polypropylene composition comprising 75.0 to 94.0% by weight of a polyethylene-polypropylene blend (A) at a weight ratio of 3, and 6.0 to 25.0% by weight of a compatibilizer (B), which is a copolymer of 1-butene and ethylene.

However, there is still a need in the industry to develop a material that can stably secure excellent physical properties so that it can be efficiently applied to the automotive interior material field using recycled polyolefin material.

Conventional technology is technical information that the inventor possessed for deriving the present invention or acquired in the process of deriving the present invention, and cannot necessarily be said to be known technology disclosed to the general public before filing the application for the present invention.

Republic of Korea Patent Publication No. 10-2021-0042974 (published on April 20, 2021) Republic of Korea Patent Publication No. 10-2021-0137576 (published on November 17, 2021)

In solving the above-mentioned problems, the purpose of the present invention is to provide a composition for automobile interior materials that can improve eco-friendliness by recycling waste resources, while simultaneously overcoming the problems of recycled materials and stably securing the physical properties required as automobile interior materials, and the same. The goal is to provide molded products using the product.

The problems to be solved by the present invention are not limited to those mentioned above, and other problems to be solved that are not mentioned can be clearly understood by a person skilled in the art to which the present invention belongs from the following description. There will be.

A composition for automobile interior materials according to an embodiment of the present invention includes 10 to 20% by weight of a first polypropylene having a first melt index; 20 to 30% by weight of a second polypropylene having a second melt index; 30 to 50% by weight of a third polypropylene having a third melt index; 5 to 10% by weight recycled polyolefin material recovered from waste plastic materials; 1 to 10% by weight of rubber material; and 1 to 10% by weight of an inorganic filler, wherein the first melt index, second melt index and third melt index satisfy the relationship of first melt index < third melt index < second melt index.

The first polypropylene has a first degree of crystallinity, the second polypropylene has a second degree of crystallinity, the third polypropylene has a third degree of crystallinity, and the first degree of crystallinity, the second degree of crystallinity and the third degree of crystallinity are 3 The relationship of crystallinity < second crystallinity < first crystallinity degree can be satisfied.

The first polypropylene has a first flexural modulus, the second polypropylene has a second flexural modulus, and the third polypropylene has a third flexural modulus, and the third flexural modulus < first flexural modulus < first 2 The relationship between flexural modulus of elasticity can be satisfied.

The first polypropylene may have a first melt index (230°C, 2.16 kgf) of 10 g/10 min to 30 g/10 min, a first crystallinity of 60% to 85%, and a first flexural modulus of 1,850 MPa to 1,950 MPa. .

The second polypropylene may have a second melt index (230° C., 2.16 kgf) of 50 g/10 min to 100 g/10 min, a second crystallinity of 55% to 85%, and a second flexural modulus of 1,870 MPa to 1,970 MPa. .

The third polypropylene may have a third melt index (230° C., 2.16 kgf) of 20 g/10 min to 40 g/10 min, a third crystallinity of 50% to 85%, and a third flexural modulus of 1,800 MPa to 1,900 MPa. .

The recycled polyolefin material may include high-density polyethylene (HDPE), low-density polyethylene (LDPE), or a combination thereof.

The recycled polyolefin material may include a material formed by pulverizing and pelletizing agricultural waste vinyl.

The rubber materials include Ethylene-octene Rubber ('EOR'), Styrene Ethylene/Butylene Styrene ('SEBS'), Ethylene Butene Rubber ('EBR'), and ethylene. It may include at least one selected from the group consisting of propylene diene rubber (Ethylene Propylene Diene Rubber, 'EPDM') and combinations thereof.

The inorganic filler may include at least one selected from the group consisting of talc, calcium carbonate, mica, sodium salt, clay, whisker, and combinations thereof.

The composition for automobile interior materials may further include at least one additive selected from UV stabilizers, antioxidants, heat stabilizers, lubricants, nucleating agents, pigments, and combinations thereof.

The composition for automobile interior materials may have a melt index of 13.5 g/10 min (230°C, 2.16 kgf) or more, a tensile strength of 26 MPa or more, and a flexural modulus of 1,730 MPa or more.

Meanwhile, a molded article according to an embodiment of the present invention is made by injection molding the composition for automobile interior materials according to the above-described embodiment.

As described above, the composition for automobile interior materials according to the present invention can produce eco-friendly products by recycling recycled polyolefin materials derived from waste resources such as agricultural waste vinyl, which are discarded as waste, into products of higher value.

In addition, the composition for automobile interior materials according to the present invention can stably exhibit the mechanical, physical, and chemical properties required in the automobile interior materials industry while using recycled materials, and can be effectively applied as automobile interior materials.

In addition, the composition for automobile interior materials according to the present invention can be manufactured at a low cost through an economical and efficient process, thereby increasing the applicability to actual industry.

The effects of the present invention are not limited to those mentioned above, and other effects not mentioned will be clearly understood by those skilled in the art from the following description.

Figure 1 is a schematic diagram of equipment used to manufacture a composition for automobile interior materials according to an embodiment of the present invention.
Figure 2 is a flowchart of a method for manufacturing a composition for automobile interior materials according to an embodiment of the present invention.

In the present invention, the accompanying drawings may be shown in exaggerated expressions for differentiation and clarity from the prior art and for convenience in understanding the technology. In addition, the terms described below are terms defined in consideration of the functions in the present invention, and may vary depending on the intention or custom of the user or operator, so definitions of these terms should be made based on the technical content throughout the present specification. will be. Meanwhile, the examples are merely illustrative of the components presented in the claims of the present invention and do not limit the scope of the present invention, and the scope of the rights should be interpreted based on the technical idea throughout the specification of the present invention. .

Throughout the specification, when a certain configuration is said to “include” a certain configuration, this means that other configurations may be further included rather than excluding other configurations, unless specifically stated to the contrary.

In addition, when a configuration is said to be “connected,” “connected,” or “coupled” to another configuration, this does not only mean “directly connected,” “directly connected,” or “directly coupled,” but also means “that.” This means that there may be cases of ‘connection with another configuration in the middle’, ‘connection with another configuration in the middle’, or ‘combined with another configuration in the middle’. On the other hand, when a configuration is said to be “directly connected,” “directly connected,” or “directly coupled” to another configuration, it should be understood that no other configuration exists in between.

Additionally, when directional terms such as “front”, “back”, “top”, “bottom”, “left”, “right”, “one end”, “other end”, “both ends”, etc. are used, this refers to the disclosed drawings. They are used illustratively in relation to the orientation and should not be construed as limiting, and when terms such as “first” and “second” are used, these are terms for distinguishing each configuration and should not be construed as restrictive. .

In order to more clearly explain the characteristics of the embodiments of the present invention, detailed descriptions will be omitted regarding matters widely known to those skilled in the art to which the following embodiments belong. In addition, detailed description of parts in the drawings that are not related to the description of the embodiment will be omitted.

Hereinafter, embodiments of the present invention will be described in detail with reference to the attached drawings.

One embodiment of the present invention provides a composition for automobile interior materials, the composition comprising three types of polypropylene, each having a different melt index; Recycled polyolefin material; rubber material; and inorganic fillers.

The three types of polypropylene represent virgin materials in contrast to recycled polyolefin. The three types of polypropylene include a first polypropylene having a first melt index, a first degree of crystallinity, and a first flexural modulus; a second polypropylene having a second melt index, a second crystallinity, and a second flexural modulus; And it may include a third polypropylene having a third melt index, a third crystallinity, and a third flexural modulus.

In this example, by using three different types of polypropylene, each with a specific melt index, crystallinity, and flexural modulus, in combination at a specific content, poor stiffness, impact strength, and mechanical properties, which can be problems when applying recycled polyolefin materials, are eliminated. It can prevent deterioration and solve problems such as bad odor or external contamination. In addition, by applying such a specific combination of three types of polypropylene, it is possible to satisfy various characteristic conditions required as automobile interior materials. In this way, only one or two types of polypropylene are used instead of using a specific combination of three types of polypropylene with specific physical properties, or when the three types of polypropylene do not have specific physical properties or are not combined in a specific composition ratio. It is difficult to fully satisfy all the various physical property conditions required as a composition for automobile interior materials.

The melt index, crystallinity, and flexural modulus of the three types of polypropylene can each satisfy the following relationships.

1st melt index < 3rd melt index < 2nd melt index

Third degree of crystallinity < Second degree of crystallinity < First degree of crystallinity

Third flexural modulus < first flexural modulus < second flexural modulus

In one embodiment, the first polypropylene may have a first melt index (230° C., 2.16 kgf) of 10 g/10 min to 30 g/10 min, a first crystallinity of 60% or more, and a first flexural modulus of 1,850 MPa to 1,950 MPa. and preferably has a first melt index of 15 g/10 min to 25 g/10 min (230°C, 2.16 kgf), a first crystallinity of 60% to 85%, and a first flexural modulus of approximately 1,870 MPa to 1,920 MPa, More preferably, it may have a first melt index (230° C., 2.16 kgf) of about 20 g/10 min, a first crystallinity of 60% to 75%, and a first flexural modulus of about 1,900 MPa.

In one embodiment, the second propylene may have a second melt index (230° C., 2.16 kgf) of 50 g/10 min to 100 g/10 min, a second crystallinity of 55% or more, and a second flexural modulus of 1,870 MPa to 1,970 MPa; , preferably a second melt index of 55 g/10 min to 85 g/10 min (230° C., 2.16 kgf), a second crystallinity of 55% to 85%, and a second flexural modulus of 1,900 MPa to 1,950 MPa, and are more preferred. Thus, it may have a second melt index of about 60 g/10 min (230° C., 2.16 kgf), a second crystallinity of 55% to 75%, and a second flexural modulus of about 1,920 MPa.

In one embodiment, the third polypropylene may have a third melt index (230° C., 2.16 kgf) of 20 g/10 min to 40 g/10 min, a third crystallinity of 50% or more, and a third flexural modulus of 1,800 MPa to 1,900 MPa. and preferably has a third melt index (230°C, 2.16 kgf) of 25 g/10 min to 35 g/10 min, a third crystallinity of 50% to 85%, and a third flexural modulus of 1,820 MPa to 1,870 MPa, and further. Preferably, it may have a third melt index of about 30 g/10 min (230° C., 2.16 kgf), a third crystallinity of 50% to 75%, and a third flexural modulus of about 1,850 MPa.

Based on the total weight of the composition, the first polypropylene may be included in an amount of 10 to 20% by weight, the second polypropylene may be included in an amount of 20 to 30% by weight, and the third polypropylene may be included in an amount of 30 to 50% by weight. The content of the three types of polypropylene can be selected to satisfy the physical properties required for the composition for automobile interior materials. If the content of the three types of polypropylene is outside the above range, it is difficult to satisfy all the various physical property conditions required as a composition for automobile interior materials. For example, in terms of physical property requirements such as melt index, tensile strength, and flexural modulus, a problem may occur in which other conditions cannot be satisfied even if one condition is met.

As such, in this embodiment, a specific combination of three different types of polypropylene with specific physical properties is used in combination with recycled polyolefin material, and in addition, specific components are included, so that it is applied to the final product, an automobile interior material, to provide excellent mechanical properties. and physical properties, and can provide molded products with excellent physical properties and improved environmental friendliness.

Recycled polyolefin material is a recycled material recovered from waste plastic materials. Recycled polyolefin materials may include waste from various industries, post-consumer waste, or combinations thereof. The recycled polyolefin material may itself be a material derived from such waste, or may be obtained from recycled waste by plastic recycling processes known in the art.

In one embodiment, the recycled polyolefin material may include high density polyethylene (HDPE), low density polyethylene (LDPE), or a combination thereof.

In one embodiment, the recycled polyolefin material may include a material formed by pulverizing and pelletizing agricultural waste vinyl.

Based on the total weight of the composition, 5 to 10% by weight of recycled polyolefin material may be included. If the content of recycled polyolefin material is less than the above range, the effect of improving environmental friendliness is minimal, and if it exceeds the above range, the content of recycled material increases and when applied as an automobile interior material, the safety factor may be lowered, which may cause problems in actual application. .

Recycled polyolefin materials may generally include polyethylene, which is an immiscible material that can lead to poor adhesion between the phases of the blend, rough morphology, and consequently poor mechanical properties. In order to solve these problems, achieve excellent stable bonding between the components of the mixture, and obtain good properties of the final product, the composition for automobile interior materials according to an embodiment of the present invention includes a rubber material.

The rubber material is added to solve the problem that the miscibility between the components constituting the composition caused by the recycled polyolefin material is reduced and the mechanical properties are poor. By applying rubber materials, compositions for automobile interior materials can stably exhibit various physical and mechanical properties.

Rubber materials include Ethylene-octene Rubber ('EOR'), Styrene Ethylene/Butylene Styrene ('SEBS'), Ethylene Butene Rubber ('EBR'), and Ethylene Propylene. It may include at least one member selected from the group consisting of diene rubber (Ethylene Propylene Diene Rubber, 'EPDM') and combinations thereof.

Based on the total weight of the composition, the rubber material may be included in an amount of 1 to 10% by weight. If the content of the rubber material is less than the above range, it is difficult to solve the problem of weakening the bond between the components and lowering the physical properties due to miscibility problems caused by the recycled polyolefin material, and if it exceeds the above range, it may cause an imbalance between the components. This may actually deteriorate the physical properties of the composition.

Inorganic fillers can be filled in the composition to provide a reinforcing effect to the composition, thereby enhancing the physical properties of the composition.

In one embodiment, the inorganic filler may include at least one selected from the group consisting of talc, calcium carbonate, mica, sodium salt, clay, whisker, and combinations thereof.

Based on the total weight of the composition, 1 to 10% by weight of inorganic filler may be included. If the content of the inorganic filler is less than the above range, the effect of reinforcing the physical properties of the composition is insufficient, and if it exceeds the above range, it may cause an imbalance between the components, which may actually deteriorate the physical properties of the composition.

In one embodiment, the composition for automobile interior materials may additionally include additives to improve properties.

Examples of additives may include, but are not limited to, at least one selected from UV stabilizers, antioxidants, heat stabilizers, lubricants, nucleating agents, pigments, and combinations thereof. Based on the total weight of the composition, additives may be included in an amount of 0.1 to 5% by weight.

The composition for automobile interior materials according to an embodiment of the present invention can exhibit sufficient properties to be applied to automobile parts, for example, the main panel or center panel of a door trim. For example, the composition for automobile interior materials according to an embodiment of the present invention may have a melt index of 13.5 g/10 min (230° C., 2.16 kgf) or more, a tensile strength of 26 MPa or more, and a flexural modulus of 1,730 MPa or more.

The composition for automobile interior materials according to the above-described embodiments can be manufactured through mixing, cooling, and pelletizing processes using extrusion equipment.

Composition production using extrusion equipment may be accomplished by introducing all components through one feeder, or may be accomplished by using multiple feeders and adding different components to each feeder.

In one embodiment, the composition for automobile interior material may be manufactured using an extrusion facility equipped with three feeders, for example, one main hopper and two side feeders. This will be explained with reference to Figures 1 and 2.

Figure 1 shows a schematic diagram of equipment used to manufacture a composition for automobile interior materials according to an embodiment of the present invention, and Figure 2 shows a flow chart of a method for manufacturing a composition for automobile interior materials according to an embodiment of the present invention.

Referring to Figures 1 and 2, the equipment used to manufacture the composition for automobile interior materials may include an extrusion device 10, a cooling device 20, and a pelletizing device 30, and the extrusion device 10 is a main hopper. (11), it may include a first side feeder 12, a second side feeder 13, and a nozzle 14. The main hopper 11 is placed at the most upstream along the flow direction of the mixture, the first side feeder 12 and the second side feeder 13 are placed in order, and the nozzle 14 is placed at the very end. You can.

In one embodiment, the extrusion device 10 may use a twin-screw compression molding machine to improve dispersibility.

The temperature from the main hopper 11 to the nozzle 14 can be set to about 160°C to 190°C, and the main hopper 11, the first side feeder 12, and the second side feeder 13 are individually A device that can adjust the input speed may be included.

Basically, the input speed of the main hopper 11 is set to about 150 to 220 rpm, and the input speeds of the first side feeder 12 and the second side feeder 13 are set to about 200 to 400 rpm. By calculating the discharge volume of the feeder quantitatively and measuring the specific gravity of the pellets made preferentially, the speed can be reset according to the design content.

The second polypropylene (PP(2)) and the third polypropylene (PP(3)) can be added to the main hopper 11 of the extrusion device 10 to form a fluidized layer in a plasticized state (S10 ). First polypropylene (PP(1)) and rubber materials can be introduced through the first side feeder (12) (S20), and recycled polyolefin materials, inorganic fillers, and optionally additives can be added through the second side feeder (13). can be input (S30). Injecting the recycled polyolefin material (recycled PO) into the third side feeder 13 at the very end is to further reduce the exposure of the recycled polyolefin material, which is derived from waste resources and has already gone through the aging/deterioration process, to deterioration conditions.

Each component input through the main hopper 11, the first side feeder 12, and the second side feeder 13 can be kneaded to form a plasticized composite material (S40).

Next, the kneaded composite material can be discharged from the nozzle 14 and cooled and solidified using the cooling device 20 (S50).

The cooling device 20 may be a water tank disposed at a certain distance from the nozzle 14. In this case, when the kneaded composite material is discharged from the nozzle 14, it can fall into the water tank 20 from a height of about 10 to 25 cm, so that the composite material can be cooled and solidified within the water tank 20.

Subsequently, the cooled composite material can be pelletized using the pelletizing device 30 (S60).

A composition for automobile interior materials according to an embodiment of the present invention can be manufactured through the above process.

Another embodiment of the present invention provides a molded article made by injection molding the composition for automobile interior materials according to the above-described embodiment. The injection molding process can be performed by selecting an appropriate process among methods known in the art.

Hereinafter, the present invention will be described in more detail through non-limiting 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.

[Example]

1. Preparation of compositions for automobile interior materials

Compositions for automobile interior materials according to Examples and Comparative Examples were prepared according to the compositions shown in Table 1 below. The content unit shown in Table 1 is weight percent.

Example Comparative example One 2 3 One 2 3 4 5 6 PP(1) 15 15 15 90 85 80 70 15 15 PP(2) 23 28 23 - - - - 23 27 PP(3) 39 34 44 - - - - 34 30 rubber
Material 5 5 5 - 5 - - 5 5 recycle
P.O. 10 10 5 10 10 20 30 15 15 filler 5 5 5 - - - - 5 5 additive 3 3 3 - - - - 3 3 Sum 100 100 100 100 100 100 100 100 100

Details of each component used to prepare the composition according to Table 1 are as follows.

- PP(1): Highly crystalline polypropylene with a crystallinity of 60% or more, a melt index of 20 g/10 min, and a flexural modulus of 1,900 MPa.

- PP(2): Highly crystalline polypropylene with a crystallinity of 55% or more, a melt index of 60 g/10 min, and a flexural modulus of 1,920 MPa.

- PP(3): Highly crystalline polypropylene with a crystallinity of 50% or more, a melt index of 30 g/10 min, and a flexural modulus of 1,850 MPa.

- Rubber material: Ethylene-octene rubber ('EOR'), Styrene Ethylene/Butylene Styrene ('SEBS'), Ethylene Butene Rubber ('EBR'), ethylene At least one selected from the group consisting of propylene diene rubber (Ethylene Propylene Diene Rubber, 'EPDM') and combinations thereof

- Recycled PO: Recycled polyolefin material, collected from agricultural waste vinyl containing high-density polyethylene (HDPE), low-density polyethylene (LDPE), or a combination of HDPE and LDPE, crushed and pelletized.

- Filler: At least one selected from the group consisting of talc, calcium carbonate, mica, sodium salt, clay, whisker, and combinations thereof

- Additives: At least one selected from UV stabilizers, antioxidants, heat stabilizers, lubricants, nucleating agents, pigments, and combinations thereof

The composition for automobile interior materials was manufactured by mixing and plasticizing each component according to the composition shown in Table 1 using the manufacturing equipment 1 shown in FIG. 1, followed by cooling and pelletizing.

Specifically, with the input speed of the main hopper 11 set to about 150 to 220 rpm, and the input speed of the first side feeder 12 and the second side feeder 13 set to about 200 to 400 rpm, each The discharge volume of the feeder was quantitatively calculated, the specific gravity of the pellets made preferentially was measured, and the speed was reset according to the design content.

The second polypropylene (PP(2)) and the third polypropylene (PP(3)) were introduced into the main hopper 11 of the extrusion device 10 to form a fluidized layer in a plasticized state. First polypropylene (PP(1)) and rubber materials were introduced through the first side feeder 12, and recycled polyolefin materials, inorganic fillers, and additives were introduced through the second side feeder 13.

After kneading each component inputted through the main hopper 11, the first side feeder 12, and the second side feeder 13 to form a plasticized composite material, the kneaded composite material is fed through the nozzle 14. The composite material was cooled and solidified within the water tank 20 by allowing it to be discharged from a height of about 10 to 25 cm and fall into the water tank 20.

Then, the cooled composite material was pelletized using a pelletizing device (30).

Each physical property of the formed pellets was evaluated as described below.

2. Evaluation of compositions for automobile interior materials

The physical properties of the compositions for automobile interior materials according to Examples and Comparative Examples prepared in 1 above were evaluated. The evaluation was conducted according to the ISO standard evaluation method, and details are as follows.

- Melt index (MI, g/10min): Evaluated according to ISO 1133-1 method

- Density: Evaluated according to ISO 1183-1 method

- Tensile strength (TS, MPa): Evaluated according to the ISO 527 method, and the tensile speed was measured at 50 mm/min.

- Elongation (EB, %): Evaluated according to the ISO 527 method, and the tensile speed was measured at 50 mm/min.

- Flexural strength (FS, MPa): Evaluated according to the ISO 178 method. At this time, the descent speed was set to 10 mm/min, the span distance was set to 64 mm, and the load value at the maximum yield point was converted to the flexural strength value. analyzed by

- Flexural modulus (FM, MPa): Evaluated according to the ISO 178 method. At this time, the descent speed was set to 10 mm/min, the span distance was set to 64 mm, and the slope value in the initial 0.05 to 0.5 strain range was the result. used as value

- IZOD impact strength (kJ/㎡): Evaluated according to ISO 180 standards and measured at RT (Room temperature, 23℃, -10℃)

- Hardness: Rockwell hardness R-scale

- Heat distortion temperature (HDT, ℃): Measured according to ISO 75 standards, and the load exposed to the sample was measured by applying a load of 0.455 MPa.

The evaluation results are shown in Table 2 below.

Example Comparative example One 2 3 One 2 3 4 5 6 MI(g/10min) 14 13.8 16.5 18 11 13 8 23 19 importance 0.954 0.954 0.953 0.902 0.905 0.907 0.908 0.964 0.964 TS(㎫) 26 27 29 29 26 25 23 21 21 EB(%) 83 105 66 300 300 300 300 18 5 FM(㎫) 1750 1780 1786 1450 1280 1130 974 1583 1672 FS(㎫) 38 38 40 40 35 31 23 30 29 IZOD(23)
(kJ/㎡) 5 5 5 8 13 36 39 5 6 IZOD(-10)
(kJ/㎡) 3 3 3 3 5 5 5 4 4 Hardness
(R-scale) 100 90 81 72 75 75 95 94 96 HDT(℃) 108 105 111 108 99 91 86 95 95

To be considered for use as an automobile interior material, for example, the main panel or center panel of a door trim, a melt index (MI) of 13 g/10 min (230°C, 2.16 kgf) or more and a tensile strength (TS) of 26 MPa or more are required. ) and a flexural modulus (FS) of 1,730 MPa or more must be met at least.

As shown in Table 2, the compositions according to Examples 1 to 3 have better melt index (MI), tensile strength (TS), and flexural modulus (FS) than the compositions according to Comparative Examples 1 to 6. It can be confirmed that it meets the requirements as an automobile interior material. In the case of Comparative Examples 1 to 6, it was confirmed that even if one characteristic satisfied the required conditions, the other characteristics did not meet the required conditions, and thus all aspects of each physical property were not satisfied.

On the other hand, the higher the content of recycled materials, the greater the benefits that can be applied in terms of automobile-related laws, but there is a problem in that the safety factor decreases as the content of recycled materials increases. Therefore, in the embodiments of the present invention, comprehensive The types and composition ratios of each component, including recycled materials, were selected by considering both physical properties and safety aspects when applied to automobile interior materials.

Therefore, the composition for automobile interior materials according to embodiments of the present invention uses recycled materials derived from agricultural waste vinyl, etc. while optimizing the components and composition ratio to solve the problems of recycled materials, so that it can be applied as automobile interior materials and have stable physical properties. can be demonstrated. The composition for automobile interior materials and molded products using the same according to embodiments of the present invention can increase eco-friendliness by applying recycled materials that were discarded as waste into high-value final products, and can secure stable physical properties as automobile interior materials.

As described above, the present invention has been described with reference to the embodiments shown in the drawings, but this is merely illustrative, and various modifications and equivalent other embodiments are possible based on common knowledge in the field to which the technology pertains. You must understand. Therefore, the true technical protection scope of the present invention is based on the claims described below and should be determined based on the specific details of the invention described above.

The present invention relates to a composition for automobile interior materials and molded products using the same, and can be used in industrial fields related to automobile interior materials.

1: Equipment for manufacturing compositions for automobile interior materials
10: Extrusion device
11: Main hopper
12: first side feeder
13: second side feeder
14: nozzle
20: Cooling device
30: Pelletizing device

Claims (13)

10 to 20% by weight of a first polypropylene having a first melt index and a first degree of crystallinity;
20 to 30% by weight of a second polypropylene having a second melt index and a second crystallinity;
30 to 50% by weight of a third polypropylene having a third melt index and a third crystallinity;
5 to 10% by weight recycled polyolefin material recovered from waste plastic materials;
1 to 10% by weight of rubber material; and
Contains 1 to 10% by weight of inorganic filler,
The first melt index, second melt index and third melt index satisfy the relationship of first melt index < third melt index < second melt index,
The first crystallinity, second crystallinity, and third crystallinity satisfy the relationship of third crystallinity < second crystallinity < first crystallinity
Composition for automobile interior materials.
delete According to paragraph 1,
The first polypropylene has a first flexural modulus, the second polypropylene has a flexural modulus of 2, and the third polypropylene has a third flexural modulus,
Satisfies the relationship of third flexural modulus < first flexural modulus < second flexural modulus of elasticity.
Composition for automobile interior materials.
According to paragraph 1,
The first polypropylene has a first melt index (230°C, 2.16 kgf) of 10 g/10 min to 30 g/10 min, a first crystallinity of 60% or more, and a first flexural modulus of 1,850 MPa to 1,950 MPa.
Composition for automobile interior materials.
According to paragraph 1,
The second polypropylene has a second melt index (230° C., 2.16 kgf) of 50 g/10 min to 100 g/10 min, a second crystallinity of 55% or more, and a second flexural modulus of 1,870 MPa to 1,970 MPa.
Composition for automobile interior materials.
According to paragraph 1,
The third polypropylene has a third melt index (230° C., 2.16 kgf) of 20 g/10 min to 40 g/10 min, a third crystallinity of 50% or more, and a third flexural modulus of 1,800 MPa to 1,900 MPa.
Composition for automobile interior materials.
According to paragraph 1,
The recycled polyolefin material includes high-density polyethylene (HDPE), low-density polyethylene (LDPE), or a combination thereof.
Composition for automobile interior materials.
According to paragraph 1,
The recycled polyolefin material includes a material formed by pulverizing and pelletizing agricultural waste vinyl.
Composition for automobile interior materials.
According to paragraph 1,
The rubber materials include Ethylene-octene Rubber ('EOR'), Styrene Ethylene/Butylene Styrene ('SEBS'), Ethylene Butene Rubber ('EBR'), and ethylene. Containing at least one member selected from the group consisting of propylene diene rubber (Ethylene Propylene Diene Rubber, 'EPDM') and combinations thereof
Composition for automobile interior materials.
According to paragraph 1,
The inorganic filler includes at least one selected from the group consisting of talc, calcium carbonate, mica, sodium salt, clay, whisker, and combinations thereof.
Composition for automobile interior materials.
According to paragraph 1,
The composition for automobile interior further includes at least one additive selected from UV stabilizers, antioxidants, heat stabilizers, lubricants, nucleating agents, pigments, and combinations thereof.
Composition for automobile interior materials.
According to paragraph 1,
The composition for automobile interior materials has a melt index of 13.5 g/10 min (230°C, 2.16 kgf) or more, a tensile strength of 26 MPa or more, and a flexural modulus of 1,730 MPa or more.
Composition for automobile interior materials.
A molded product obtained by injection molding the composition for automobile interior materials according to any one of claims 1 or 3 to 12.

Images