KR102150266B1 - Polyolefin elastomer composition - Google Patents

Abstract

The polyolefin-based elastomer composition according to an embodiment of the present invention includes a mixture (A) containing two or more propylene-based polymers having different melt indexes; Non-Control Rheology ethylene-propylene copolymer (B); Long fiber reinforcement (C); Thermoplastic elastomer (D); Graft-modified propylene copolymer (E); And antimony oxide (F); Includes. Through this, embodiments of the present invention have excellent stiffness and impact resistance even when formed into a thin form, and thus a polyolefin-based elastomer composition minimizing the generation of organic volatile substances and a crash pad for automobiles including the same can be provided. .

Description

Polyolefin-based elastomer composition {POLYOLEFIN ELASTOMER COMPOSITION}

Embodiments of the present invention relate to a polyolefin-based elastomer composition and a crash pad for a vehicle including the same.

Since commercialization, automobiles have developed in the direction of increasing weight in order to meet the demands of passengers' safety guarantees, large-sized vehicles, and high-end designs. However, a decrease in fuel economy due to an increase in weight leads to an increase in fuel consumption and carbon dioxide emissions, and thus it is difficult to meet the strict environmental regulations every year.

Therefore, in recent years, while maintaining the safety devices, reinforcement structures, and advanced convenience devices of automobiles, reducing the total weight of the vehicle body at the same time has emerged as a great task for related manufacturers.

On the other hand, crash pads are representative parts used as interior materials for automobiles. In general, the interior material is attached to the interior of the vehicle in front of the driver's seat or inside the door. These 　 interior materials not only decorate the interior of the car, but also reduce injuries by mitigating the impact of the occupant in the event of an accident.

An installation hole for installing various control units and convenience devices is formed in an interior material such as a crash pad. Therefore, while the convenience devices are stably installed, the crash pad composition needs to be excellent in moldability and processability in order to realize an appearance that harmonizes with them.

In addition, since the interior material is installed inside the vehicle, it is directly related to the health of the user. Accordingly, regulations related to the amount of volatile organic compounds generated in automobile interior materials are being strengthened.

Conventionally, a method of using various chemical substances including photocatalysts has been known to reduce volatile organic compounds generated in automobile interior materials. However, this method has a problem that is difficult to generalize because the processing cost is very expensive.

Accordingly, there is an increasing need for a technology capable of realizing excellent physical properties and processability while minimizing the volatile organic compounds of the materials used for crash pads and the like.

One object of the present invention is to provide a polyolefin-based elastomer composition having excellent long-term and short-term heat resistance and a crash pad for automobiles including the same.

Another object of the present invention is to provide a polyolefin-based elastomer composition having excellent physical properties and a crash pad for automobiles including the same, even when it is molded to a thin thickness.

Another object of the present invention is to provide a polyolefin-based elastomer composition that minimizes the generation of volatile organic compounds, and a crash pad for automobiles including the same.

Another object of the present invention is to provide a polyolefin-based elastomer composition having excellent impact resistance and rigidity, and a crash pad for a vehicle including the same.

Another object of the present invention is to provide a polyolefin-based elastomer composition having excellent moldability and processability, and a crash pad for a vehicle including the same.

The above and other objects of the present invention can be achieved by the present invention described below.

Polyolefin-based elastomer composition according to an embodiment of the present invention includes a mixture (A) containing a propylene-based polymer; Non-Control Rheology ethylene-propylene copolymer (B); Long fiber reinforcement (C); Thermoplastic elastomer (D); Graft-modified propylene copolymer (E); And antimony oxide (F); Includes. The mixture (A) containing the propylene-based polymer contains two or more propylene-based polymers having different melt indexes.

The polyolefin-based elastomer composition comprises a mixture (A) 35 parts by weight to 55 parts by weight, based on 100 parts by weight of the total polyolefin-based elastomer composition, comprising two or more propylene-based polymers having different melt indexes; Non-Control Rheology ethylene-propylene copolymer (B) 30 parts by weight to 40 parts by weight; Long fiber reinforcement (C) 15 parts by weight to 30 parts by weight; 5 to 15 parts by weight of thermoplastic elastomer (D); Graft-modified propylene copolymer (E) 0.1 to 2.5 parts by weight; And 0.2 to 5.0 parts by weight of antimony oxide (F); It may include.

The mixture (A) containing the propylene-based polymer comprises a first propylene polymer having a melt index of 0.1 g/10 min to 5 g/10 min at a temperature of 230° C. and a load of 2.16 kg; And a second propylene polymer having a melt index of 50 g/10 minutes to 100 g/10 minutes at a temperature of 230° C. and a load of 2.16 kg. It may include.

Each of the first and second propylene polymers is polymerized with a metallocene catalyst, and may have an isotactic degree of 95% to 100%.

The mixture (A) including the propylene polymer may have a polydispersity index (PDI) of 2 to 5.

The non-flow-controlled (Non-Control Rheology) ethylene-propylene copolymer (B) may contain 20% to 50% by weight of ethylene and 50% to 80% by weight of propylene in the ethylene-propylene copolymer (B). have.

The non-controlled ethylene-propylene copolymer (B) may have a ratio of ethylene to propylene of 1:1 to 1:4.

The non-flow-controlled (Non-Control Rheology) ethylene-propylene copolymer (B) may have a melt index of 10 g/10 minutes to 20 g/10 minutes at a temperature of 230° C. and a load of 2.16 kg.

The long fiber reinforcement material (C) may have a length of 2mm to 20mm.

The long fiber reinforcement material (C) may be at least one of glass fiber, carbon fiber, basalt fiber, polymer fiber, natural fiber, and mixtures thereof.

The thermoplastic elastomer (D) may be an ethylene-olefin copolymer, a styrene-diene copolymer, or a mixture thereof.

The olefin contained in the ethylene-olefin copolymer may be an alpha-olefin having 4 to 20 carbon atoms.

The thermoplastic elastomer (D) may have a melt index of 10 g/10 minutes to 40 g/10 minutes at a temperature of 230° C. and a load of 2.16 kg.

The graft-modified propylene copolymer (E) may be obtained by introducing at least one compound of an unsaturated carboxylic acid compound, an unsaturated carboxylic acid derivative compound, an organosilane compound and an organosilane derivative compound into a propylene polymer with a grafting group.

The compound introduced into the grafting group may be included in an amount of 5% to 10% by weight of the total graft-modified propylene copolymer (E).

The antimony oxide (F) may have a specific surface area of 70 m ² /g to 300 m ² /g.

The antimony oxide (F) may have an average particle diameter of 0.001 μm to 1 μm.

Another embodiment of the present invention relates to a crash pad used as an interior material for automobiles. The crash pad may include the polyolefin-based elastomer composition of the above-described embodiment.

Embodiments of the present invention have the effect of the present invention for providing a polyolefin-based elastomer composition having excellent long-term and short-term heat resistance, and a crash pad for a vehicle including the same.

Another object of the present invention is to provide a polyolefin-based elastomer composition that minimizes the generation of volatile organic compounds, and a crash pad for automobiles including the same.

Embodiments of the present invention can provide a polyolefin-based elastomer composition having excellent physical properties and a crash pad for automobiles including the same, even when molding to a thin thickness.

Embodiments of the present invention may provide a polyolefin-based elastomer composition having excellent impact resistance and rigidity, and a crash pad for a vehicle including the same.

Embodiments of the present invention can provide a polyolefin-based elastomer composition having excellent moldability and processability, and a crash pad for a vehicle including the same.

Polyolefin-based elastomer composition according to an embodiment of the present invention includes a mixture (A) containing a propylene-based polymer; Non-Control Rheology ethylene-propylene copolymer (B); Long fiber reinforcement (C); Thermoplastic elastomer (D); Graft-modified propylene copolymer (E); And antimony oxide (F); Includes.

(A) a mixture containing a propylene polymer

The mixture (A) containing the propylene-based polymer contains two or more propylene-based polymers having different melt indexes.

In the present specification, the propylene-based polymer may be optionally classified into a "first propylene-based polymer", a "second propylene-based polymer", and the like according to the range of the melt index.

The mixture (A) containing a propylene-based polymer according to an embodiment includes a first propylene polymer having a melt index of 0.1 g/10 minutes to 5 g/10 minutes at a temperature of 230° C. and a load of 2.16 kg; And a second propylene polymer having a melt index of 50 g/10 minutes to 100 g/10 minutes at a temperature of 230° C. and a load of 2.16 kg. It may include. In this case, while improving the impregnation property of the long fiber reinforcement to be described later, it is possible to impart physical properties suitable for use as a crash pad. In addition, it is possible to suppress the generation of organic volatile substances.

Each of the first propylene polymer and the second propylene polymer may be a polypropylene polymer polymerized with a metallocene catalyst. The polypropylene polymer polymerized with the metallocene catalyst may be, for example, isotactic polypropylene, syniotactic polypropylene, or hemiisotactic polypropylene. In one embodiment, the first propylene polymer and the second propylene polymer are polymerized with a metallocene catalyst, so that the Isotactic Index is, for example, 95% or more, 95% to 100%, 95% to 99.9. % Or 98% to 99.9%. In the case of using such a propylene-based polymer, it is possible to lower the polydispersity index while improving the heat resistance of the polyolefin-based elastomer.

The content of the first propylene polymer may be 0.1 parts by weight to 5.0 parts by weight based on 100 parts by weight of the mixture (A) including the total propylene polymer. Within the above range, it is possible to prevent a decrease in processability of the composition, a decrease in impregnation property, and a decrease in rigidity.

The content of the second propylene polymer may be from 50 parts by weight to 100 parts by weight based on 100 parts by weight of the mixture (A) including the total propylene polymer. Within the above range, it is possible to prevent impregnation and rigidity of the long fibers from deteriorating, and to reduce the amount of volatile organic compounds generated.

The mixture (A) containing the propylene-based polymer may have a polydispersity index (PDI) of 2 to 5, 2 to 4, or 2 to 3. Within the above range, it is possible to prevent a decrease in the stiffness and heat resistance while preventing the processability of the composition from deteriorating. In addition, due to its excellent dispersibility, the amount of volatile organic compounds generated can be reduced.

The content of the mixture (A) containing the propylene polymer is, for example, 35 to 55 parts by weight, 40 to 55 parts by weight, or 45 to 50 parts by weight based on 100 parts by weight of the total polyolefin-based elastomer composition. I can. In the above range, the content of the propylene-based polymer is low, so that the heat resistance is prevented from deteriorating, and the rigidity and impact resistance of the polyolefin-based elastomer are deteriorated.

(B) Ethylene-propylene copolymer

Ethylene-propylene copolymer (B) is a Non-Control Rheology ethylene-propylene copolymer.

The term "Non-Control Rheology" used in the present specification may specifically mean that the polymer has not undergone a cracking process. The cracking process may mean, for example, a process of artificially decomposing a polymer. Specifically, the cracking process may be a process of artificially controlling fluidity by introducing peroxide into the extruder.

In the case of using the non-flow-controlled ethylene-propylene copolymer, the generation of low molecular weight substances can be minimized, and thus the amount of volatile organic compounds can be reduced.

The ethylene-propylene copolymer (B) subjected to Non-Control Rheology may be a copolymer of an ethylene monomer and a propylene monomer. For example, the ethylene-propylene copolymer may be a block copolymer including an ethylene monomer and a propylene monomer as a copolymerization unit. In this case, it is possible to improve the impact resistance while maintaining the heat resistance and rigidity of the polyolefin-based elastic body.

The polymerization ratio or the like of the ethylene-propylene copolymer is not particularly limited, and an appropriate ratio may be adjusted according to desired physical properties.

In one embodiment, the non-controlled ethylene-propylene copolymer (B) contains 20% to 50% by weight or 30% to 50% by weight of ethylene in the ethylene-propylene copolymer (B). Can include. It is possible to prevent the stiffness and impact resistance from deteriorating within the above range.

In another embodiment, the non-controlled ethylene-propylene copolymer (B) contains 50% to 80% or 50% to 70% by weight of propylene in the ethylene-propylene copolymer (B). Can include. It is possible to prevent the stiffness and impact resistance from deteriorating within the above range.

In another embodiment, the ethylene-propylene copolymer (B) subjected to Non-Control Rheology may have a ratio of ethylene to propylene of 1:1 to 1:4 or 1:1 to 1:2. In the above range, it is possible to prevent the heat resistance from being lowered, and to prevent the rigidity and impact resistance from being lowered.

Non-controlled ethylene-propylene copolymer (B) has a melt index at a temperature of 230° C. and a load of 2.16 kg, for example, 10 g/10 min to 20 g/10 min or 15 g It may be from /10 minutes to 20 g/10 minutes. Within the above range, it is possible to further improve the rigidity and impact resistance while preventing the impregnation from deteriorating.

The content of the non-controlled ethylene-propylene copolymer (B) may be, for example, 30 to 40 parts by weight or 30 to 35 parts by weight based on 100 parts by weight of the total polyolefin-based elastomer composition. . Within the above range, it is possible to maintain the appropriate rigidity for application as a crash pad while preventing the impact resistance from deteriorating. In addition, it is possible to minimize the generation of organic volatile substances.

(C) Long fiber reinforcement

The term "long fiber" or "long fiber reinforcement" as used herein may mean a fiber having a length of 2 mm or more or a processed product thereof. The length of the long fibers is not particularly limited as long as it can be classified as generally long fibers. For example, it may be 2mm to 20mm, 2mm to 18mm, 3mm to 18mm, or 8mm to 12mm. Within the above range, it is possible to improve the impact resistance while effectively reducing the brittleness of the elastic body. In addition, even when the polyolefin-based elastomer composition is formed thinly within the above range, sufficient rigidity and physical properties can be secured.

In one embodiment, the long fibers may have a length of 2 mm or more, 3 mm or more, specifically 8 mm to 12 mm, in an elastic body manufactured by injecting a polyolefin-based elastic body composition.

In another embodiment, the long fiber reinforcement material (C) may be included in the polyolefin-based elastomer composition and processed into plastic pellets. In this case, the length of the long fiber reinforcement may be the same as the length of the pellet. The length of these pellets may be, for example, 8mm to 12mm or 8mm to 10mm.

The long fiber reinforcement material (C) is impregnated in the polyolefin-based elastic body, so that rigidity and impact resistance can be improved. In this case, even if the polyolefin-based elastic body is molded into a thin film, sufficient rigidity and impact resistance can be exhibited. At the same time, the brittleness of the crash pad can also be remarkably lowered, which has an excellent effect on weight reduction.

The long fiber reinforcing material (C) is not particularly limited, but may be, for example, at least one of glass fiber, carbon fiber, basalt fiber, polymer fiber, natural fiber, and mixtures thereof. When using the above exemplary type of long fiber reinforcement may be more advantageous in weight reduction.

The long fiber reinforcement material (C) may have, for example, an average fiber diameter of 6 μm to 20 μm, 6 μm to 15 μm, and 10 μm to 20 μm. The average fiber diameter is calculated by dividing the sum of the fiber diameters of the long fibers by the number of the total long fibers. Within the above range, physical properties such as impact resistance and strength of the elastic body can be effectively improved. At the same time, even when thinning, brittleness is low and light weight can be imparted to the polyolefin elastomer.

Long fibers have a length-to-diameter ratio (Aspect ratio), for example, 100: 1 to 3500: 1, 100: 1 to 1000: 1, 100: 1 to 500: 1 or 100: 1 to 200: 1 day I can. Within the above range, the impregnation property is excellent, and physical properties can be improved without disturbing the flowability of the composition.

The processing form of the long fiber reinforcement (C) is, for example, fiber roving, multi-end roving, single end roving, roving cloth, and surface mat. mat) or tissue (tissue), but is not limited thereto. In the case of processing in the above exemplary form, the polyolefin-based elastomer can be further thinned, which is effective in reducing weight. The processing form may be used by adopting an appropriate method according to the desired physical properties and other properties of the elastic body without limitation.

The content of the long fiber reinforcing material (C) may be, for example, 15 to 30 parts by weight, 15 to 25 parts by weight, or 20 to 25 parts by weight based on 100 parts by weight of the total polyolefin-based elastomer composition. Within the above range, a decrease in weld strength due to a decrease in flowability may be prevented while preventing a decrease in rigidity and impact resistance, and an increase in weight may be prevented.

The long fiber reinforcement material (C) may further include, for example, a bundling agent. The bundling agent can improve the impregnation and compatibility of the long fibers and the composition impregnated with the long fibers.

The type of the bundling agent is not particularly limited, and those having excellent compatibility with the long fiber reinforcing material may be used. For example, it is known to be used together with a material of a long fiber reinforcement material, or a binding agent or a binder known to have excellent compatibility may be used by employing an appropriate one.

The bundling agent may be included, for example, in 3 parts by weight to 5 parts by weight, 3 parts by weight to 4 parts by weight, or 4 parts by weight to 5 parts by weight based on 100 parts by weight of the total long fiber. While improving the impregnation and compatibility of the long fibers within the above range, the physical properties of the entire polyolefin-based elastomer composition are not reduced.

(D) Thermoplastic elastomer

The thermoplastic elastomer (D) may be an ethylene-olefin copolymer, a styrene-diene copolymer, or a mixture thereof.

The ethylene-olefin copolymer may include an ethylene monomer and an olefin monomer as a copolymerization unit. The olefin contained in the ethylene-olefin copolymer may be an alpha-olefin having 4 or more carbon atoms. For example, the olefin may be an alpha-olefin having 4 to 20 carbon atoms or an alpha-olefin having 4 to 10 carbon atoms. Specifically, for example, 1-butene, 1-pentene, 1-hexene, 1-heptene, 1-octene, 1-nonene, 1-decene, and the like, but are not limited thereto.

The ethylene-olefin copolymer may be a block copolymer or a graft copolymer. The polymerization ratio of the ethylene-olefin copolymer is not particularly limited, and an appropriate ratio may be adjusted and used according to desired physical properties. In one embodiment, the ethylene-olefin copolymer may include 0.1% to 99.9% by weight of ethylene. In another embodiment, the ethylene-olefin copolymer may contain 0.1% to 99.9% by weight of olefin. Within the above range, the ethylene-olefin copolymer may further improve impact resistance and processability of the polyolefin-based elastomer.

The content of the ethylene-olefin copolymer may be 0% to 100% by weight, 20% to 80% by weight, or 40% to 60% by weight of the thermoplastic elastomer (D). Within the above range, the ethylene-olefin copolymer may prevent a decrease in flowability of the polyolefin-based elastomer and improve impact resistance.

The styrene-diene copolymer may include a styrene monomer and a diene monomer as a copolymerization unit. In this case, the styrene-diene copolymer may be a block copolymer or a graft copolymer. The styrene monomer may be, for example, alpha-methylstyrene, alpha-ethylstyrene, alpha-propylstyrene, but is not limited thereto. The diene monomer may be butadiene or isoprene, but is not limited thereto.

The polymerization ratio or the like of the styrene-diene copolymer is not particularly limited, and an appropriate one may be employed depending on desired physical properties. In one embodiment, the styrene-diene copolymer may include 0.1% to 99.9% by weight of styrene. In another embodiment, the styrene-diene copolymer may contain 0.1% to 99.9% by weight of diene. Within the above range, the styrene-diene copolymer may further improve the rigidity of the polyolefin-based elastomer.

The content of the styrene-diene copolymer may be 0% to 100% by weight, 20% to 80% by weight, or 40% to 60% by weight based on 100% by weight of the thermoplastic elastomer (B). Within the above range, the styrene-diene copolymer may prevent a decrease in flowability of the polyolefin-based elastomer composition and improve impact resistance.

The thermoplastic elastomer (D) has a melt index at a temperature of 230° C. and a load of 2.16 kg, for example, 10 g/10 minutes to 40 g/10, 10 g/10 minutes to 30 g/10 minutes or 15 g/10 minutes To 30 g/10 minutes. Within the above range, it is possible to prevent the impregnation property from deteriorating, and to prevent the rigidity and impact resistance from deteriorating. In addition, it is possible to prevent a decrease in rigidity and reduce the amount of volatile organic compounds generated.

The content of the thermoplastic elastomer (D) may be 5 parts by weight to 15 parts by weight, 8 parts by weight to 15 parts by weight, 5 parts by weight to 10 parts by weight, or 8 parts by weight to 10 parts by weight based on 100 parts by weight of the total polyolefin-based elastomer composition. have. Within the above range, it is possible to prevent a decrease in flowability of the polyolefin-based elastomer composition and improve impact resistance. In addition, it is possible to prevent a decrease in rigidity and reduce the amount of volatile organic compounds generated.

(E) Graft modified propylene copolymer

The graft-modified propylene copolymer (E) may be obtained by introducing at least one compound of an unsaturated carboxylic acid compound, an unsaturated carboxylic acid derivative compound, an organosilane compound and an organosilane compound derivative compound into a propylene polymer with a grafting group. The grafting group may serve to impart a functional group such as an alkyl group, an aryl group, a cycloalkyl group, and an alkoxy group to the propylene polymer. Through these functional groups, the graft-modified propylene copolymer can improve compatibility with other components included in the polyolefin-based composition. In this case, it is possible to prevent the phase separation phenomenon of the composition, and improve processability and physical properties.

The propylene polymer is 90% to 95% by weight, 90% to 94% by weight, 90% to 93% by weight, 91% to 94% by weight based on 100% by weight of the total graft-modified propylene copolymer (E) Or 91% to 93% by weight. Within the above range, the compatibility between the fiber and the resin may be improved, and physical properties may be improved.

The compound used as the grafting group is 5 wt% to 10 wt%, 6 wt% to 10 wt%, 7 wt% to 10 wt%, 6 wt% based on 100 wt% of the total graft-modified propylene copolymer (E) It may be from 9% by weight or 7% by weight to 9% by weight. Within the above range, while further improving the compatibility between the fiber and the resin, excessive increase in water content and occurrence of brittleness can be prevented.

The graft-modified propylene copolymer (E) may be 0.1 parts by weight to 2.5 parts by weight, 0.5 parts by weight to 1.0 parts by weight to 2 parts by weight, or 1.5 parts by weight to 2 parts by weight based on 100 parts by weight of the total polyolefin-based elastomer composition. Within the above range, the compatibility of the composition may be improved to prevent phase separation, and processability and physical properties may be improved.

(F) antimony oxide

Antimony oxide (F) may play a role of adsorbing low molecular weight substances generated in the entire polyolefin-based elastomer composition. In this case, it is possible to reduce the amount of organic volatile substances eluting out.

Antimony (Sb) has an atomic number of 51 and may be a trivalent ion or a pentavalent ion. Antimony oxide (F) may react with oxygen to form, for example, SbIII ₂ O ₃ , SbV ₂ O _5, or the like. In addition, the antimony oxide may exist as a phase in which antimony trivalent ions (SbIII) and pentavalent ions (SbV) coexist, but is not limited thereto.

In one embodiment, the antimony oxide may be represented by Sb ₂ O _n . The n may be 3≦n≦5.

Antimony oxide can be prepared in a porous form with controlled oxygen content and particle size. In this case, the antimony oxide can more effectively adsorb the organic volatile material.

Antimony oxide (F) has a specific surface area of 70 m ² /g or more, 70 m ² /g to 300 m ² /g, 70 m ² /g to 200 m ² /g, 80 m ² /g to 200 m ² /g, 90 m ² /g to 200 m ² /g, 90 m ² /g to 180 m ² /g, or 120 m ² /g to 180 m ² /g. Within the above range, the active area of the antimony oxide increases, so that the amount of volatile organic compounds generated can be more effectively reduced.

The antimony oxide (F) may have an average particle diameter of, for example, 1 μm or less, 0.001 μm to 1 μm, 0.01 μm to 1 μm, or 0.1 μm to 1 μm. Within this range, the reduction of volatile organic compounds is more efficient.

The content of the antimony oxide (F) is, for example, 0.2 to 5 parts by weight, 0.5 to 5 parts by weight, 1 to 5 parts by weight, or 3 to 5 parts by weight based on 100 parts by weight of the total elastic body composition. It may be parts by weight. Within the above range, it is possible to maintain excellent mechanical properties while lowering the amount of organic compounds generated.

In addition, the polyolefin-based thermoplastic elastomer composition may include, for example, antioxidants, ultraviolet absorbers, neutralizing agents, nucleating agents, lubricants, light stabilizers, heat stabilizers, release agents, flame retardants, pigments, Other physical properties may be imparted by including one or more additives among antistatic agents, antibacterial agents, processing aids, metal deactivating agents, antifriction agents, antiwear agents, and coupling agents.

The method of manufacturing the polypropylene elastomer composition according to the embodiments of the present invention is not particularly limited. Such a manufacturing method can be used by employing an appropriate one of methods well known in the relevant technical field.

A method for preparing a polypropylene elastomer composition according to an embodiment is a conventional mechanical kneading method, comprising: a mixture (A) containing each propylene-based polymer; Non-Control Rheology ethylene-propylene copolymer (B); Thermoplastic elastomer (D); Graft-modified propylene copolymer (E); And antimony oxide (F); Can be mixed or melted. Then, a mixture (A) containing a propylene polymer; Non-Control Rheology ethylene-propylene copolymer (B); Thermoplastic elastomer (D); Graft-modified propylene copolymer (E); And antimony oxide (F); It may be a method of kneading according to a conventional method, and impregnating a preheated long fiber reinforcement (C).

Another embodiment of the present invention relates to a crash pad used as an interior material for automobiles. The crash pad may include the polyolefin-based elastomer composition described above.

A method of applying a crash pad by molding or processing the polyolefin-based elastomer composition of one embodiment of the present invention is not particularly limited, and a suitable one of methods known in the art may be employed.

Hereinafter, the present invention will be described in more detail through the following examples. These examples are merely illustrative of the present invention, and it will be apparent to those skilled in the art that various changes and modifications are possible within the scope and spirit of the present invention.

Manufacturing example

Preparation of a mixture (A) containing two or more propylene polymers having different melt indexes

The first propylene polymer polymerized with a metallocene catalyst (melt index = 1 g/10 min at A1, 230°C and 2.16 kg, PDI = 2.7, II = 97%) and the second propylene polymerized with a metallocene catalyst A propylene polymer (A) was prepared by mixing a polymer (A1, melt index at 230°C and 2.16 kg = 100, PDI = 2.7, II = 98%).

The I.I (isotactic index) uses a soxhlet extractor to extract the polymer to be measured, and then measures the weight that does not dissolve in boiling n-heptane. Then, I.I (isotactic index) can be calculated according to Equation 1 below.

<Equation 1>

I.I (isotactic index) = (weight of polymer remaining after extraction/weight of polymer before extraction) * 100

Preparation of ethylene-propylene copolymer (B) subjected to non-control rheology

As an ethylene-propylene copolymer (B1), a copolymer having a melt index of 20 g/10 min at 230° C. and 2.16 kg and an ethylene content of 20 wt% in the ethylene-propylene copolymer (B1) was prepared. The ethylene-propylene copolymer (B1) was controlled non-flow.

As an ethylene-propylene copolymer (B2), a copolymer having a melt index of 20 g/10 min at 230° C. and 2.16 kg and an ethylene content of 20 wt% in the ethylene-propylene copolymer (B1) was prepared. The ethylene-propylene copolymer (B2) was flow controlled.

The ethylene content in the ethylene-propylene copolymer was measured through FT-IR.

Preparation of long fiber reinforcement (C)

Glass fibers having a cross-sectional area of 17 μm and TEX=2400 were processed with fiber roving with a long fiber reinforcement (C).

Thermoplastic elastomer (D)

As the thermoplastic elastomer (D1), an ethylene-(1-butene) copolymer (melt index at 230° C. and 2.16 kg = 30, butene content = 25 wt%) was prepared.

As a thermoplastic elastomer (D2), a styrene-diene copolymer (melt index at 230° C. and 2.16 kg = 10, styrene content = 14 wt%) was prepared.

In this case, the content (% by weight) of butene or styrene is based on an ethylene-butene copolymer or a styrene-diene copolymer, respectively.

Grafted Modified Propylene Polymer (E)

A grafted modified propylene polymer (E) containing a carboxyl group (-COOH) derived from an unsaturated carboxylic acid compound in a grafting ratio of 5 wt% was used. The graft ratio (Fc) was measured by FT-IR.

Antimony oxide (F)

An antimony oxide having an average particle diameter of 1 μm and a specific surface area of 100 m ² /g was used. The average particle diameter was measured through a particle size analyzer (PSA).

In the above, the melt index was measured under the conditions of ASTM D1238 (temperature 230° C., load 2.16 kg), and the polydispersity index (PDI) was measured through gel permeation chromatography (GPC).

Examples 1 to 4 and Comparative Examples 1 to 4

(A), (B), (D), (E) and (F) prepared according to the above preparation example were added to Henschel mixer according to the content ratio in Table 1, and then dry blended for 3 minutes to obtain a mixture Was prepared. The mixture was melt-kneaded using a twin screw extruder (diameter 45 mm ψ) set at 230° C. and put into an impregnation tank. At the same time, a polyolefin-based elastomer composition was prepared by passing a long fiber reinforcement (C) processed by fiber roving through an impregnation tank.

The polyolefin-based elastomer composition was prepared as a composition pellet so that the length of the pellet was 10 mm. Each of the obtained pellets was injected under conditions of an injection machine nozzle temperature of 250°C and a cylinder temperature of 220°C to 240°C to prepare a specimen of an elastic body.

After the specimen was molded, the experiment was performed after leaving it for 48 hours under constant temperature and humidity conditions of 23°C and 50% relative humidity.

division
(Unit: parts by weight) A B C D E F A1 A2 B1 B2 D1 D2 Example One 12 27 30 0 18 8 0 2 3 2 12 27 30 0 18 0 8 2 3 3 10 27 30 0 18 8 0 2 5 4 13 27 30 0 18 8 0 One 3 5 11.5 27 30 0 18 8 0 2.5 3 Comparative example One 12 27 0 30 18 8 0 2 3 2 15 27 30 0 18 8 0 2 0 3 0 32 30 0 18 8 0 2 10 4 12.5 27 30 0 18 8 0 4.5 0

<Physical property evaluation>

Physical properties were evaluated for the elastic specimens prepared in Examples 1 to 4 and Comparative Examples 1 to 4 according to the evaluation method described in Table 2 below. The results of the physical property evaluation are shown in Table 3.

Test Items Method (ASTM) unit density D792 g/cm3 Tensile strength (50mm/min) D638 MPa Elongation (elongation at break, 50mm/min) D638 % Flexural strength (10mm/min) D790 MPa Flexural strain (10mm/min) D790 J/m Izod impact strength (23 ℃) D256 J/m Izod impact strength (minus 10℃) D256 J/m Heat deflection temperature D648 ℃ Mineral content D2584 Parts by weight

<Evaluation of Volatile Organic Compounds Generation>

Prepare a 3L airtight container and seal the inside. Thereafter, it was left in an oven at 65° C. for 2 hours, and then left at room temperature for 30 minutes. A TVOC (total volatile organic compound) measuring instrument with a resolution of less than 0.01ppm measures the amount of TVOC and aldehyde-based compounds generated inside a sealed container.

The elastic specimens (4cm*9cm) prepared in Examples 1 to 4 and Comparative Examples 1 to 4 described above were put in a 3L sealed container and sealed. Thereafter, it was left in an oven at 65° C. for 2 hours, and then left at room temperature for 30 minutes. A TVOC (total volatile organic compound) measuring instrument with a resolution of less than 0.01ppm measures the amount of TVOC and aldehyde-based compounds generated inside a sealed container.

From the amount of TVOC and aldehyde-based compounds measured after placing the specimen, subtract the amount of generation before placing the specimen. Through this, the amount of TVOC and aldehyde compounds in the specimen is calculated. The results are shown in Table 3 below.

Test Items Example 1 Example 2 Example 3 Example 4 Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 density 1.035 1.035 1.045 1.035 1.03 1.014 1.056 1.035 The tensile strength 73 74 74 72 73 71 75 72 Elongation 3.1 3 2.6 3 2.9 3.2 2.2 3 Flexural strength 87 88 87.5 86 86 85 90 84 Flexural strain 3950 4100 4150 4000 3900 3790 4600 3660 Izod impact strength (image 23℃) 220 235 210 220 220 230 170 240 Izod impact strength (minus 10℃) 200 200 185 200 200 220 145 220 Heat deflection temperature 156 156 158 156 154 148 164 156 Mineral content 21 21 23 21 21 18 25 21 TVOC 2.63 2.86 2.06 2.52 5.1 4.58 1.9 8.4 Aldehyde compound 1.26 1.21 0.6 0.84 2.25 1.56 0.5 3.38

As shown in Table 3, it can be seen that the compositions of Examples 1 to 4 satisfy physical properties such as tensile strength, elongation, flexural strength, flexural strain, Izod impact, and thermal strain temperature.

On the other hand, in the case of Comparative Example 1 in which the non-flow-controlled ethylene-propylene copolymer was not used, the generation of volatile organic compounds was high.

In addition, it was found that in Comparative Examples 2 and 4 in which antimony oxide was not used, the amount of volatile organic compounds was high.

In Comparative Example 3, the first propylene polymer was not used and the antimony oxide was contained in an excessive amount, and the impact strength was not sufficient. In this case, it may be unsuitable to be used for application purposes such as crash pads for automobiles.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above embodiments, but may be manufactured in various different forms, and those of ordinary skill in the art to which the present invention pertains are It will be appreciated that it can be implemented in other specific forms without changing any or essential features. Therefore, it should be understood that the embodiments described above are illustrative in all respects and not limiting.

Claims (17)

A mixture (A) comprising two or more propylene-based polymers having different melt indexes from each other; Non-Control Rheology ethylene-propylene copolymer (B); Long fiber reinforcement (C); Thermoplastic elastomer (D); Graft-modified propylene copolymer (E); And antimony oxide (F); Polyolefin-based elastomer composition comprising a. The method of claim 1,
Based on 100 parts by weight of the total polyolefin-based elastomer composition
35 to 55 parts by weight of a mixture (A) comprising two or more propylene-based polymers having different melt indexes;
Non-Control Rheology ethylene-propylene copolymer (B) 30 parts by weight to 40 parts by weight;
Long fiber reinforcement (C) 15 parts by weight to 30 parts by weight;
5 to 15 parts by weight of thermoplastic elastomer (D);
Graft-modified propylene copolymer (E) 0.1 to 2.5 parts by weight; And
Antimony oxide (F) 0.2 parts by weight to 5.0 parts by weight; polyolefin-based elastomer composition comprising. The method of claim 1,
The mixture (A) containing a propylene polymer is
A first propylene polymer having a melt index of 0.1 g/10 min to 5 g/10 min at a temperature of 230° C. and a load of 2.16 kg; And
A second propylene polymer having a melt index of 50 g/10 min to 100 g/10 min at a temperature of 230° C. and a load of 2.16 kg; Polyolefin-based elastomer composition comprising a. The method of claim 3,
The first propylene polymer and the second propylene polymer are each polymerized with a metallocene catalyst, and a polyolefin-based elastomer composition having an isotactic degree of 95% to 100%. The method of claim 1,
The mixture (A) containing a propylene polymer is a polyolefin-based elastomer composition having a polydispersity index (PDI) of 2 to 5. The method of claim 1,
Non-controlled ethylene-propylene copolymer (B) is a polyolefin-based polyolefin containing 20% to 50% by weight of ethylene and 50% to 80% by weight of propylene in the ethylene-propylene copolymer (B) Elastomer composition. The method of claim 1,
Non-control rheology (Non-Control Rheology) ethylene-propylene copolymer (B) is a polyolefin-based elastomer composition in which the ratio of ethylene to propylene is 1:1 to 1:4. The method of claim 1,
Non-controlled (Non-Control Rheology) ethylene-propylene copolymer (B) is a polyolefin-based elastomer composition having a melt index of 10g/10 minutes to 20g/10 minutes at a temperature of 230°C and a load of 2.16kg. The method of claim 1,
Long fiber reinforcement (C) is a polyolefin-based elastomer composition having a length of 2mm to 20mm. The method of claim 1,
The long fiber reinforcement material (C) is a polyolefin-based elastomer composition comprising at least one of glass fibers, carbon fibers, basalt fibers, polymer fibers, natural fibers, and mixtures thereof. The method of claim 1,
The thermoplastic elastomer (D) comprises an ethylene-olefin copolymer, a styrene-diene copolymer, or a mixture thereof,
The olefin is an alpha-olefin having 4 to 20 carbon atoms, a polyolefin-based elastomer composition. The method of claim 1,
The thermoplastic elastomer (D) is a polyolefin-based elastomer composition having a melt index of 10 g/10 minutes to 40 g/10 minutes at a temperature of 230° C. and a load of 2.16 kg. The method of claim 1,
Graft-modified propylene copolymer (E) is a polyolefin-based elastomer composition in which at least one compound of an unsaturated carboxylic acid compound, an unsaturated carboxylic acid derivative compound, an organosilane compound and an organosilane derivative compound is introduced into a propylene polymer with a grafting group . The method of claim 13,
The compound introduced into the grafting group is a polyolefin-based elastomer composition contained in 5% to 10% by weight of the total graft-modified propylene copolymer (E). The method of claim 1,
Antimony oxide (F) is a polyolefin-based elastomer composition having a specific surface area of 70 m ² /g to 300 m ² /g. The method of claim 1,
Antimony oxide (F) is a polyolefin-based elastomer composition having an average particle diameter of 0.001 μm to 1 μm. A crash pad for a vehicle comprising the polyolefin-based elastomer composition according to claim 1.