KR19990079124A - Impact Resistant Resin Composition - Google Patents

Abstract

The present invention relates to a resin composition for an automobile bumper that has excellent impact resistance and heat resistance, various fluidity, and improved paintability through crosslinking and decomposition reaction of polypropylene and thermoplastic elastomer.

The following (A) component 1-70 weight part, (B) component 10-70 weight part, (C) component 0.01-10 weight part, (D) component 0.01-2.0 weight part, (E) component 5-40 weight And 0 to 20 parts by weight of component (F).

Component (A): polypropylene homopolymer having a melt index of 0.1 to 3 g / 10 min (230 ° C., 2.16 Kgf) and a weight average molecular weight of 300,000 g / mol or more, or a propylene satisfying the same conditions and an alpha olefin having 2 to 10 carbon atoms. Mole% or less copolymer,

(B) Component: A binary air with a propylene homopolymer having a melt index of 10 to 60 g / 10 min (230 ° C., 2.16 Kgf) and a weight average molecular weight of 300,000 g / mol or more, or a C2-C10 alpha olefin satisfying the same conditions. coalescence,

(C) component: vinyl-based crosslinking aid,

(D) component: two or more organic peroxides having different decomposition temperatures,

(E) component: thermoplastic elastomer rubber,

(F) Component: Inorganic filler.

Description

Impact Resistant Resin Composition

The present invention relates to an impact resistant resin composition having excellent impact resistance and fluidity. More particularly, the present invention relates to impact resistance and heat resistance through crosslinking and decomposition reaction of polypropylene and thermoplastic elastomer, and has various fluidity and improved paintability. It relates to a resin composition for automobile bumpers to be implemented.

Polypropylene resins have excellent molding processability and chemical resistance, and have excellent advantages such as tensile strength, flexural strength, rigidity, etc., and low cost, and are being applied to various applications such as injection and compression. In addition, polypropylene resin compositions with improved physical properties through the addition of rubbers to improve impact resistance and the addition of inorganic fillers to reinforce rigidity may be used to replace the polyurethane resin compositions or PC / PBT resin compositions previously used as materials for automobile bumper covers. The trend is to expand its application range.

According to this trend, research on the polypropylene resin composition for automobile bumper covers is very active, and numerous patents and research papers have been published. In recent years, many researches have been conducted in the direction of imparting a coating function or the like to the resin composition and making it highly functional. In Japanese Patent Laid-Open No. 1-182338, methacrylates and hydroxyl groups containing long alkyl groups are described. In the Japanese Patent Laid-Open Publication No. 55-3414, a composition consisting of an acrylic acid-modified polypropylene styrene-butadiene copolymer, a polystyrene resin and a glycidyl methacrylate is disclosed. Japanese Patent Laid-Open No. 63-39950 discloses a patent such as a resin composition composed of polypropylene, ethylene-propylene rubber and styrene-ethylene-butadiene-styrene block copolymer rubber, but such resin compositions Impact strength decrease due to compatibility and solvent stability There is a problem in the mechanical properties or ppajimyeo can not ensure the desired coating properties.

On the other hand, research to give a specific function to the polypropylene has been in progress for a long time. One of them is research on a technique for providing functionality using various vinyl monomers and organic peroxides.

High functionalization of polypropylene using the monomers can be classified into two directions at present. First, a vinylsilane derivative is grafted to polypropylene, and then the silanol group of vinylsilane is crosslinked by moisture (JP59036115A, JP06065388, EP491561 A). , JP02166106), a technique for crosslinking while suppressing the decomposition reaction of polypropylene by organic peroxide by controlling the multifunctional monomer and extrusion temperature simultaneously with extrusion (DE 4308590 A, EP467178), which increases the degree of creep resistance by It aims at improving heat resistance. Secondly, grafting of vinyl monomers having polar side chains or reactive groups at the side chain ends to polypropylene is a technology that provides functionality such as adhesion and antistatic properties (JP08143744 A, JP06228520 A, JP05192386 A, EP 311722 A). Graft polypropylene is also used as a compatibilizer in blending polypropylene and other resins [US 4997884, J. Appl. Polym. Eng. Scj., 35, 41 (1995)] have many application areas.

However, when looking at the problems in the above two directions, most of the crosslinking techniques aim to have a crosslinking degree of at least 60% in the direction of increasing the degree of crosslinking, which is crosslinked and becomes thermosetting, thereby approaching diversification of fluidity, which is the primary criterion for a wide range of applications. Attempts have been made, and polypropylene functionalization technology is grafted, resulting in severe degradation of polypropylene, which is why various products have low satisfaction as raw materials.

However, according to the inventors who have been invented and patented (Korean Patent Application No. 98-10099), a small amount of crosslinked structure is dispersed phase and high flow index by controlling the degree of crosslinking of polypropylene resin itself and morphological control of dispersed phase and continuous phase. If the resin having a continuous phase, the cross-linked structure acts as an impact modifier, such as rubber or elastomer, and has been found to have good moldability. In addition, it has been found that it can serve as the polypropylene and have good moldability. In addition, the technology for crosslinking and grafting of polypropylene shows that in most cases, polypropylene resins having a high weight average molecular weight and a low flow index resin are used, and the higher the molecular weight, the higher the probability of crosslinking rather than decomposition. Because. From this point of view, a large amount of high molecular weight polypropylene and a small amount of high flow resin are used for extrusion resin with a low flow index, and a small amount of high molecular weight polypropylene and a large amount of high flow resin are used when high flow is required such as injection. By controlling the degree of crosslinking and flow, plastics having various fluidity and excellent physical properties can be obtained by themselves, and when a mixture of organic peroxide and high organic peroxide having a low half-life temperature is used, the low temperature is a crosslinking efficiency. The low and high degree of decomposition of polypropylene is low, but the decomposition reaction is severe, indicating that the control range for fluidity can be extended even more than the control of fluidity by the two polypropylene compositions. Moreover, it turned out that the graft reaction of the reactive monomer which has a polar group as polypropylene can harmonize the improvement of the coating property of polyolefin resin itself.

Based on the polypropylene having improved impact resistance, heat resistance, flowability, and paintability as described above, automobiles may be added through the addition of rubbers and inorganic fillers to reinforce the impact resistance and rigidity that can be used as a material for automobile bumper covers. The resin composition for the bumper cover could be completed.

Therefore, the present inventors mix polypropylene resin having a high weight average molecular weight and polypropylene resin having high fluidity and excellent fluidity in a proportion, and as a crosslinking aid, styrene derivatives, acrylate derivatives, vinyl ethers, vinyl ester derivatives, and the like. Polypropylene resin composition reacted or extruded using single or mixed monomers and two or more organic peroxides having different decomposition temperatures, alone or in combination. (It has a certain level of crosslinking, resulting in an increase in impact resistance, heat resistance and stiffness, and low melt resin. Of various types of fluidity that can be molded from extruded products to large injection products of high melt resins), and the impact resistance, heat resistance and paintability are harmonized by adding rubbers and inorganic fillers for higher impact resistance and rigidity reinforcement. Resin composition for automobile bumper implemented I know that you can get, thereby completing the present invention.

That is, the object of the present invention is 1 to 70 parts by weight of the following (A) component, 10 to 70 parts by weight of (B) component, and 0.01 to 10 PHR (Part Per Hundred Resin: hereinafter PHR) (C). D) Component 0.01-2.0 PHR, (E) component 5-40 weight part, (F) component 0-20 weight part It is providing the resin composition for automobile bumper covers characterized by the above-mentioned.

As the component (A), a propylene homopolymer or a C2-C10 alken-1 (hereinafter referred to as C2-10) monomer such as propylene and ethylene, butene-1, 4-methyl-pentene-1, hexene-1, octene, etc. As a copolymer with a polypropylene resin having a C2-10 monomer content of 0 to 10 mol%, a melt index of 0.1 to 3 g / 10 min (230 ° C.) and a weight average molecular weight of 300,000 g / mol or more,

Component (B) is a copolymer of propylene and C2-10 monomers, a polypropylene resin having a C2-10 content of 11-25 mol% and a melt index of 10-60 g / 10 min (230 ° C.),

Component (C) is a crosslinking aid that minimizes decomposition of polypropylene and promotes crosslinking. Styrene, α-Methyl Styrene, Methyl Methacrylate, and Ethyl-Methacrylate ( Ethyl Methacrylate, Cyclohexyl Methacrylate, Phenyl Methacrylate, Benzyl Methacrylate, Benzyl Methacrylate, Glycidyl Methacrylate, Benzyl Acrylate , Ethyl acrylate (Ethyl Acrylate), cyclohexyl acrylate (Cyclohexyl Acrylate), phenyl acrylate (Phenyl Acrylate), benzyl acrylate (Benzyl Acrylate), butyl acrylate (Butyl Acrylate), glycidyl acrylate (Glycidyl Acrylate) ), Vinyl acetate, vinyl benzoate, methyl vinyl ether, ethyl vinyl ether,, propyl vinyl ether opyl Vinyl Ether), Butyl Vinyl Ether, etc.

Component (D) is benzoyl peroxide, lauryl peroxide, dicumyl peroxide, bis (t-butylperoxyisopropyl) benzene [Bis (t-Butyl) as a reaction initiator. Peroxy Isopropyl) Benzene], 2.5-dimethyl-2,5-di (t-butylperoxy) hexane [2,5-Dimethyl-2,5-di (t-Butyl Peroxy) Hexane], 2,5-dimethyl- Organic peroxide compounds such as 2,5-di (t-butylperoxy) hexane-3 [2,5-Dimethyl-2,5-di- (t-Butyl Peroxy) Hexane-3],

As the component (E), ethylene-propylene rubber (EPR), ethylene-propylene-diene rubber (EPDM), ethylene-octene copolymer, styrene-butadiene rubber (SBR) and the like used for reinforcing impact resistance may be used. Among them, it is preferable to use an ethylene-octene copolymer which can reduce the stiffness as much as possible. %, Preferably 23 to 25%, melt index of 0.5 to 8 g / 10 min (190 ° C., 2.16 Kgf), density of 0.868 to 0.885 / cc (Dupont-Dow Elastomer ENGAGE series),

(F) component is an inorganic filler used as a rigid reinforcement of the resin composition may be used talc, silica, calcium carbonate, clay, carbon black, etc. Among them, talc using a distinctive increase in the rigidity of the resin composition with increasing content It is preferable that the average particle size thereof is 1 to 30 µm, and preferably 5 to 10 µm.

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

The present invention is 1 to 70 parts by weight of component (A), 1 to 70 parts by weight of component (B), 0.01 to 10 PHR of component (c) 0.01 to 2.0 PHR of component (D), 5 to 40 parts by weight of component (E), (F) Component 0-20 weight part, It is related with the resin composition for automobile bumper covers characterized by the above-mentioned.

Component (A) is a high molecular weight polypropylene in which crosslinking reaction occurs mainly, and is a propylene homopolymer or a copolymer of propylene and C2-10 monomers, and has a C2-10 monomer content of 0-10 mol% and a melt index of 0.1-3 g / 10 min (230 ° C) or more, preferably C 2 ~ 10 monomer content of 15 to 25 mol%, it is good to use a melt index of 20 to 60 g / 10 min (230 ° C).

Component (C) is a crosslinking aid that inhibits decomposition of polypropylene during crosslinking, promotes crosslinking reaction, and improves coating properties, such as styrene, alphamethylstyrene, methyl methacrylate, ethyl methacrylate, cyclohexyl methacrylate, Phenyl methacrylate, benzyl methacrylate, glycidyl methacrylate, methyl acrylate, ethyl acrylate, cyclohexyl acrylate, phenyl acrylate, benzyl acrylate, butyl acrylate, glycidyl acrylate, vinyl acetate And vinyl benzoate, methyl vinyl ether, ethyl vinyl ether, propyl vinyl ether, butyl vinyl ether, and the like. Preferably, a mixture of an acrylate or methacrylate derivative and a styrene derivative is used.

Component (D) is an organic peroxide that performs the reaction of the reaction initiator, benzoyl peroxide, lauryl peroxide, dicumyl peroxide, bis (t-butylperoxyisopropyl) benzene, 2,5-dimethyl-2,5- Di (t-butylperoxy) hexane, 2,5-dimethyl-2,5-di (t-butylperoxy) hexane-3 and the like are preferably used in combination with a low half-life temperature and a high one for the purpose of fluidity control. .

(E) Component is a thermoplastic elastomer rubber used for reinforcing impact resistance. Ethylene-propylene rubber (EPR), ethylene-propylene-diene rubber (EPDM), ethylene-octene copolymer, styrene-butadiene rubber (SBR), etc. can be used. Among these, it is preferable to use the ethylene-octene copolymer which can reduce the stiffness as much as possible, and the impact strength improvement effect is remarkably reduced by the long side chain octene group. The ethylene-octene copolymer has an octene content of 10 to 39%, preferably 23 to 25%, a melt index of 0.5 to 8 g / 10 min (190 ° C, 2.16 Kgf) and a density of 0.868 to 0.885 g / cc (Dupont) -Dow Elastomers' ENGAGE series).

(F) component is an inorganic filler used as a rigid reinforcement of the resin composition may be used talc, silica, carbon carbonate, clay, carbon black, etc. Among them, using a talc distinctly increased stiffness of the resin composition with increasing content It is preferable. The average particle size thereof is 1 to 30 µm, preferably 5 to 10 µm.

Hereinafter, the present invention will be described in detail through various examples.

The physical property evaluation method of the various compositions adopted by the following example and the comparative example was performed by the following test method.

1) Melt index was measured by ASTM D1238, test conditions 230 ℃, 2.16Kgf.

2) The flexural strength and flexural modulus were measured by ASTM D 790 method. The test piece was 127 × 6.4mm and the test speed (crosshead speed) was 28mm / min.

3) IZOD impact strength was measured by ASTM D 256 method. Specimen size is 63.5 × 12.7 × 3㎜.

4) The heat deflection temperature was measured by ASTM D 648, and the specimen size was 4.6 kgf used for the 127 × 12.7 × 6.4 mm test.

5) Peel strength (180 °, Peel Strength) was coated with a two-component urethane paint with a thickness of 50㎛ without pretreatment, dried for 30 minutes at 90 ℃ and left for 48 hours at room temperature to obtain a test specimen for measurement. The test piece thus prepared was cut into 1 cm in width and 15 cm in length, and then measured by an Instron universal testing machine.

[Example 1] to [Example 6]

(A) 10, 20, 30, 40, 50, 60 parts by weight of a polypropylene resin having a melt index of 0.5 g / 10 min (230 ° C., 2.16 Kgf), a weight average molecular weight of 500,000 g / mol, and an ethylene content of 60% (A) (B) 60, 50, 40, 30, 20, 10 parts by weight of a polypropylene resin having a melt index of 35 g / 10 min and an ethylene content of 18% mol as the component (C), methyl methacrylate 2.0 PHR and styrene 2.0 PHR, Ethylene benzoyl peroxide 0.3PHR and bis (t-butylperoxyisopropyl) benzene 0.1PHR as (D) component, octene content 25% as (E) component, 0.5g / 10min (190 degreeC, 2.16Kgf) melt index 20 parts by weight of an octene copolymer and 10 parts by weight of talc having an average diameter of 7 μm as a component (F) were mixed with a Henschel mixer for 3 minutes, followed by injection at 190 to 250 ° C. with an extruder. Physical properties were measured by the method described above, and the measurement results are shown in Table 1.

EXAMPLE 7

Melt Index 0.5g / 10min (230 DEG C, 2.16Kgf) as (A) Component, Weight average molecular weight 500,000g / mol, 20 parts by weight of polypropylene resin having 6% ethylene content, Melt Index 60g / 10min as (B) component, 50 parts by weight of a polypropylene resin having an ethylene content of 18 mol%, (meth) methacrylate 2.0PHR and styrene 2.0PHR as components (c), 0.3PHR of benzoyl peroxide and bis (t-butylperoxyisopropyl) as components (D) Benzene 0.1PHR, 20 parts by weight of ethylene octene copolymer having an octene content of 25%, melt index of 0.5g / 10min (190 ° C, 2.16Kgf) as component (E), talc 10 having an average diameter of 7 μm as component (F) The resin composition to which the weight part was added was manufactured and measured in the same manner as in Example 1, and the measurement results are shown in Table 1 below.

EXAMPLE 8

Melt index 1.5g / 10min (230 ° C, W.16Kgf) as component (A), weight average molecular weight 400,000g / mol, 20 parts by weight of polypropylene resin having 6% ethylene content, melt index 35g / 10min as component (B) , 50 parts by weight of a polypropylene resin having an ethylene content of 18 mol%, methyl methacrylate 2.0PHR and styrene 2.0PHR as (C) component, 0.3PHR of benzoyl peroxide as a component (D) and bis (t-butylperoxyisopropyl) ) The resin composition to which 10 parts by weight of talc having an average diameter of 7 μm was added as 0.1 PHR and (E) component was manufactured and measured in the same manner as in Example 1, and the measurement results are shown in Table 1 below.

EXAMPLE 9

Melt Index 1.5g / 10min (230 ° C., 2.16Kgf) as Component (A), Weight Average Molecular Weight 400,000g / mol, 20 parts by weight of polypropylene resin with 6% Ethylene Content, Melt Index 60g / 10min as Component (B), 50 parts by weight of a polypropylene resin having an ethylene content of 18 mol%, methyl methacrylate 2.0 PHR and styrene 2.0 PHR as (C) component, 0.3 PHR of benzoyl peroxide and bis (t-butylperoxy isopropyl) as (D) component Benzene 0.1PHR, 20 parts by weight of octene content of 25% octene as component (E), melt index 0.5g / 10min (190 ° C, 2.16Kgf), talc 10 with average diameter of 7 μm as component (F) The resin composition to which the weight part was added was manufactured and measured in the same manner as in Example 1, and the measurement results are shown in Table 1 below.

[Example 10] to [Example 12]

Melt Index 0.5g / 10min (230 DEG C, 2.16Kgf) as (A) Component, Weight average molecular weight 500,000g / mol, 20 parts by weight of polypropylene resin having 6% ethylene content, Melt Index 35g / 10min as (B) component, 50 parts by weight of a polypropylene resin having an ethylene content of 18 mol%, methyl methacrylate 1.0, 3.0, 5.0 PHR and styrene 1.0, 3.0, 5.0 PHR, and (B) benzoyl peroxide 0.3 PHR and bis, respectively, as components (C) (t-butylperoxyisopropyl) benzene 0.1PHR, 20 parts by weight of an ethylene-octene copolymer having an octene content of 25%, a melt index of 0.5g / 10min (190 ° C, 2.16Kgf) as a component (E) and (F) As a resin composition in which 10 parts by weight of talc having an average diameter of 7 μm was added as in Example 1, the preparation and physical properties were measured, and the measurement results are shown in Table 1 below.

EXAMPLE 13

Melt Index 0.5g / 10min (230 DEG C, 2.16Kgf) as (A) Component, Weight average molecular weight 500,000g / mol, 20 parts by weight of polypropylene resin having 6% ethylene content, Melt Index 35g / 10min as (B) component, 50 parts by weight of a polypropylene resin having an ethylene content of 18 mol%, methyl methacrylate 2.0 PHR and ethyl methacrylate 2.0 PHR as (C) component, 0.3 benzoyl peroxide as component (D) and bis (t-butylperoxy) Isopropyl) benzene 0.1PHR, 20 parts by weight of an ethylene-octene copolymer having an octene content of 25% as the (E) component, a melt index of 0.5g / 10min (190 ° C, 2.16Kgf), and an average diameter of 7 µm as the component (F) The resin composition to which 10 parts by weight of phosphorous talc was added was prepared in the same manner as in Example 1 and physical properties were measured, and the measurement results are shown in Table 1.

[Example 14] to [Example 15]

Melt Index 0.5g / 10min (230 DEG C, 2.16Kgf) as (A) Component, Weight average molecular weight 500,000g / mol, 20 parts by weight of polypropylene resin having 6% ethylene content, Melt Index 35g / 10min as (B) component, 50 parts by weight of a polypropylene resin having an ethylene content of 18 mol%, methyl methacrylate 2.0 PHR and styrene 2.0 PHR as (C) component, 0.2, 0.3 PHR as benzoyl peroxide as (D) component, and octene as (E) component, respectively A resin composition having a content of 25%, 20 parts by weight of an ethylene-octene copolymer having a melt index of 0.5 g / 10 min (190 ° C., 2.16 Kgf) and 10 parts by weight of talc having an average diameter of 7 μm as a component (F) Preparation and physical properties were measured in the same manner as in Example 1, and the measurement results are shown in Table 1.

EXAMPLE 16

Melt Index 0.5g / 10min (230 DEG C, 2.16Kgf) as (A) Component, Weight average molecular weight 500,000g / mol, 20 parts by weight of polypropylene resin having 6% ethylene content, Melt Index 35g / 10min as (B) component, 50 parts by weight of a polypropylene resin having an ethylene content of 18 mol%, methyl methacrylate 2.0PHR and styrene 2.0PHR as (C) component, 0.3PHR and 2.5-dimethyl-2.5-di (t-) as benzoyl peroxide as (D) component. Butylperoxy) hexane-3 0.1 PHR, 20 parts by weight of an ethylene-octene copolymer having an octene content of 25% as the component (E), a melt index of 0.5 g / 10 min (190 DEG C, 2.16 Kgf), and an average diameter as the component (F) The resin composition to which 10 weight part of this talc which is 7 micrometers was added was manufactured and measured in the same manner as Example 1, and the measurement result is shown in Table 1.

[Example 17] to [Example 21]

Melt Index 0.5g / 10min (230 DEG C, 2.16Kgf) as (A) Component, Weight average molecular weight 500,000g / mol, 20 parts by weight of polypropylene resin having 6% ethylene content, Melt Index 35g / 10min as (B) component, 65, 60, 55, 45, 40 parts by weight of polypropylene resin having an ethylene content of 18 mol%, methyl methacrylate 2.0 PHR and styrene 2.0 PHR as (C) component, and 0.3 PHR and benzoyl peroxide as (D) component, respectively (t-butylperoxyisopropyl) benzene 0.1PHR, ethylene-octene copolymer with octene content 25% and melt index 0.5g / 10min (190 ° C, 2.16Kgf) as component (E) 5, 10, 15, 25 , 30 parts by weight, and a resin composition containing 10 parts by weight of talc having an average diameter of 7 μm as a component (F) were prepared and measured in the same manner as in Example 1, and the measurement results are shown in Table 1 below.

[Example 22] to [Example 27]

Melt Index 0.5g / 10min (230 DEG C, 2.16Kgf) as (A) Component, Weight average molecular weight 500,000g / mol, 20 parts by weight of polypropylene resin having 6% ethylene content, Melt Index 35g / 10min as (B) component, 50 parts by weight of a polypropylene resin having an ethylene content of 18 mol%, methyl methacrylate 2.0 PHR and styrene 2.0 PHR as (C) component, 0.3 PHR of benzoyl peroxide and bis (t-butylperoxy isopropyl) as (D) component 20 parts by weight of ethylene-propylene-diene rubber (Example 23) and (F) components having a propylene content of 26% and a melt index of 3.2 g / 10 min (230 ° C., 2.16 Kgf) as the benzene 0.1 PHR and (E) components, respectively. The resin composition to which 10 parts by weight of talc having a diameter of 7 μm was added was manufactured and measured in the same manner as in Example 1, and the measurement results are shown in Table 1 below.

[Example 24] to [Example 27]

Melt Index 0.5g / 10min (230 DEG C, 2.16Kgf) as (A) Component, Weight average molecular weight 500,000g / mol, 20 parts by weight of polypropylene resin having 6% ethylene content, Melt Index 35g / 10min as (B) component, 60, 55, 45, 40 parts by weight of polypropylene resin having an ethylene content of 18 mol%, methyl methacrylate 2.0 PHR and styrene 2.0 PHR as (C) component, 0.3 PHR and bis (t) as benzoyl peroxide as (D) component -Butyl peroxyisopropyl) benzene 0.1PHR, 20 parts by weight of an ethylene-octene copolymer having an octene content of 25% as the (E) component, a melt index of 0.5g / 10min (190 DEG C, 2.16Kgf), and an average as the component (F) The resin compositions in which 0, 3, 6, and 13 parts by weight of talc having a diameter of 7 μm were added were prepared and measured in the same manner as in Example 1, and the measurement results are shown in Table 1 below.

[Example 28] to [Example 30]

Melt Index 0.5g / 10min (230 DEG C, 2.16Kgf) as (A) Component, Weight average molecular weight 500,000g / mol, 20 parts by weight of polypropylene resin having 6% ethylene content, Melt Index 35g / 10min as (B) component, 50 parts by weight of a polypropylene resin having an ethylene content of 18 mol%, (meth) methyl methacrylate (Example 28), styrene (Example 29), ethyl methacrylate (Example 30) 2.0 PHR (D) 0.3 PHR of benzoyl peroxide and 0.1 PHR of bis (t-butylperoxyisopropyl) benzene as the component, 25% octene as the (E) component, and ethylene-octene air having a melt index of 0.5g / 10min (190 ° C, 2.16Kgf) The resin composition to which 20 parts by weight of the copolymer and 10 parts by weight of talc having an average diameter of 7 μm was added as the component (F) was manufactured and measured in the same manner as in Example 1, and the measurement results are shown in Table 1 below.

[Example 31] to [Example 33]

Melt Index 0.5g / 10min (230 DEG C, 2.16Kgf) as (A) Component, Weight average molecular weight 500,000g / mol, 20 parts by weight of polypropylene resin having 6% ethylene content, Melt Index 35g / 10min as (B) component, 50 parts by weight of a polypropylene resin having an ethylene content of 18 mol%, methylmethacrylate 2.0 PHR and styrene 2.0 PHR as (C) component, and benzoyl peroxide (Example 31) and bis (t-butylper) as (D) components, respectively. Oxyisopropyl) benzene (Example 32) 2,5-dimethyl-2,5-di (t-butylperoxy) hexane-3 (Example 33) 0.3 PHR, octene content 25% as component (E), molten 20 parts by weight of an ethylene-octene copolymer having an index of 0.5 g / 10 min (190 ° C., 2.16 Kgf) and 10 parts by weight of talc having an average diameter of 7 μm as a component (F) were added in the same manner as in Example 1. Preparation and physical properties were measured, and the measurement results are shown in Table 1.

[Comparative Example 1]

(A) Component: Melt index of 0.5g / 10min (230 ℃, 2.16Kgf), weight average molecular weight of 500,000g / mol, ethylene content of 6% by weight of polypropylene resin, 70 parts by weight of octene, 25% of melt index, 0.5g 20 parts by weight of an ethylene-octene copolymer of 10 min (190 ° C, 2.16 Kgf) and 10 parts by weight of talc having an average diameter of 7 µm were added as (F) component in the same manner as in Example 1 The measurement was performed and the measurement results are shown in Table 1.

[Comparative Example 2]

(B) The component has a melt index of 35g / 10min (230 ° C, 2.16Kgf), 70 parts by weight of polypropylene resin having an ethylene content of 18 mol%, an octene content of 25%, and a melt index of 0.5g / 10min (190 ° C, 2.16Kgf). The resin composition to which 20 weight part of ethylene-octene copolymers and 10 weight part of talc whose average diameter is 7 micrometers was added as (F) component was manufactured and measured in the same manner as Example 1, and the measurement result was shown in Table 1 Shown in

[Comparative Example 3] to [Comparative Example 5]

(A) 20 parts by weight of polypropylene resin having a melt index of 0.5 g / 10 min (230 ° C., 2.16 Kgf), a weight average molecular weight of 500,000 g / mol, and an ethylene content of 6%; and (B) a melt index of 35 g / 10 min ( 230 ° C., 2.16 Kgf), 50 parts by weight of a polypropylene resin having an ethylene content of 18 mol%, and (E) an ethylene-octene air having an octene content of 25% and a melt index of 0.5 g / 10 min (190 ° C., 2.16 Kgf), respectively. Coalescence (comparative example 3), propylene content 26%, ethylene-propylene rubber with melt index 3.2 g / 10 min (230 ° C., 2.16 Kgf) (comparative example 4), propylene content 28% melt index 0.14 g / 10 min (230 ° C., 20 parts by weight of an ethylene-propylene-diene rubber (Comparative Example 5) of 2.1 Kgf) and (F) a resin composition to which 10 parts by weight of talc having an average diameter of 7 µm was added in the same manner as in Example 1 The measurement was performed and the measurement results are shown in Table 1.

[Comparative Example 6]

(A) 20 parts by weight of polypropylene resin having a melt index of 0.5 g / 10 min (230 ° C., 2.16 Kgf), a weight average molecular weight of 500,000 g / mol, and an ethylene content of 6%; and (B) a melt index of 35 g / 10 min ( 230 ° C., 2.16 Kgf), 50 parts by weight of a polypropylene resin having an ethylene content of 18 mol%, an ethylene-octene copolymer having an octene content of 25% and a melt index of 0.5 g / 10 min (190 ° C., 2.16 Kgf) as an (E) component 30 The resin composition to which the weight part was added was manufactured and measured in the same manner as in Example 1, and the measurement results are shown in Table 1 below.

[Comparative Example 7]

(A) 20 parts by weight of polypropylene resin having a melt index of 0.5 g / 10 min (230 ° C., 2.16 Kgf), a weight average molecular weight of 500,000 g / mol, and an ethylene content of 6%; and (B) a melt index of 35 g / 10 min ( 230 ° C., 2.16 Kgf), a resin composition in which 50 parts by weight of a polypropylene resin having an ethylene content of 18 mol% and 30 parts by weight of talc having an average diameter of 7 μm were added as a component (E) in the same manner as in Example 1 Physical properties were measured, and the measurement results are shown in Table 1.

[Comparative Example 8]

(A) 20 parts by weight of polypropylene resin having a melt index of 0.5 g / 10 min (230 ° C., 2.16 Kgf), a weight average molecular weight of 500,000 g / mol, and an ethylene content of 6%; and (B) a melt index of 35 g / 10 min ( 230 ° C., 2.16 Kgf), 50 parts by weight of a polypropylene resin having an ethylene content of 18 mol%, 0.3 PHR of benzoyl peroxide and 0.1 PHR of bis (t-butylperoxyisopropyl) benzene as component (D), (E) A resin composition was added having an octene content of 25%, a melt index of 0.5 g / 10 min (190 ° C., 2.16 Kgf) of 20 parts by weight of ethylene-octene copolymer, and (F) component of 10 parts by weight of talc having an average diameter of 7 μm. Preparation and physical properties were measured in the same manner as in Example 1, and the measurement results are shown in Table 1.

As can be seen from the above description, the resin composition for automobile bumper cover having excellent impact resistance and fluidity and paintability of the present invention has the impact strength, heat resistance and paintability of the polypropylene resin itself through a certain amount of crosslinking degree. Improved physical properties and cost of automobile bumper cover materials by having excellent impact resistance, flowability and paintability without the addition of small amounts of rubber components and inorganic fillers (impact resistance and reinforcement) and other additives for improving paintability Can contribute to

Claims (5)

The following (A) component 1-70 weight part, (B) component 10-70 weight part, (C) component 0.01-10 weight part, (D) component 0.01-2.0 weight part, (E) component 5-40 weight And 0 to 20 parts by weight of component (F). Component (A): polypropylene homopolymer having a melt index of 0.1 to 3 g / 10 min (230 ° C., 2.16 Kgf) and a weight average molecular weight of 300,000 g / mol or more, or a propylene satisfying the same conditions and an alpha olefin having 2 to 10 carbon atoms. Mole% or less copolymer, (B) Component: A binary air with a propylene homopolymer having a melt index of 10 to 60 g / 10 min (230 ° C., 2.16 Kgf) and a weight average molecular weight of 300,000 g / mol or more, or a C2-C10 alpha olefin satisfying the same conditions. coalescence, (C) component: vinyl-based crosslinking aid, (D) component: two or more organic peroxides having different decomposition temperatures, (E) component: thermoplastic elastomer rubber, (F) Component: Inorganic filler. The method of claim 1, The vinyl-based crosslinking aid is at least one selected from the group consisting of styrene derivatives, acrylate derivatives, vinyl acetate, vinyl benzoate, vinyl ether derivatives impact resistance resin composition. The method of claim 1, The organic peroxide may be benzoyl peroxide, lauryl peroxide, dicumyl peroxide, bis (t-butylperoxyisopropyl) benzene, 2,5-dimethyl-2,5di (t-butylperoxy) hexane, 2 Shock-resistant resin composition, characterized in that one of, 5-dimethyl-2,5di (t-butylperoxy) hexane-3. The method of claim 1, The thermoplastic elastomer rubber is at least one selected from ethylene-propylene rubber (EPR), ethylene-propylene-diene rubber (EPDM), ethylene-octene copolymer, styrene-butadiene (SBR) Resin composition. The method of claim 1, The inorganic filler is a resin composition for impact resistance bumper cover, characterized in that one of talc, silica, calcium carbonate, calcium silicate, clay, carbon black.