JP2001261902A - Polypropylene-based resin composition - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a polypropylene-based resin composition excellent in stiffness, heat resistance and scratch resistance and suitable for automotive internal trim parts. SOLUTION: This polypropylene-based resin is characterized by comprising 100 pte.wt. polypropylene-based polymer, 5-50 pts.wt. surface-treated talc and 0.05-5 pts.wt. at least one additive selected from fatty acid amides and glycerol fatty acid monoesters.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a polypropylene resin composition, and more particularly, to a polypropylene resin composition having excellent rigidity, heat resistance and scratch resistance.

[0002]

2. Description of the Related Art Polypropylene resins are used in a wide range of fields because they have good moldability and excellent physical properties. In the field of automotive interior and exterior parts, etc.,
In order to improve the rigidity and heat resistance of polypropylene resin,
Incorporation of an inorganic filler such as talc is widely performed.

In recent years, attempts have been made to control the shape and surface treatment of inorganic fillers in order to meet the demand for higher performance, and many resin compositions with improved rigidity and heat resistance have been disclosed.

[0004] However, the above-mentioned polypropylene resin blended with an inorganic filler such as talc has a drawback that when it is colored black or brown, the scratch is white and conspicuous because it is used for automobile interior parts and the like. Therefore, development of a material having rigidity and heat resistance and excellent scratch resistance is desired.

[0005]

SUMMARY OF THE INVENTION Therefore, Japanese Patent Application Publication No.
No. 09378 proposes a resin composition filled with a propylene / ethylene block copolymer, talc and silicone oil.

However, the resin composition described in Japanese Patent Application Laid-Open No. 6-509378 has improved scratch resistance, but has poor workability and is difficult to disperse uniformly because the silicone oil is liquid. There is a problem that the effect of improving the scratch resistance is not sufficiently exhibited. Further, there is a problem that the cost is low because the silicone oil is expensive.

Accordingly, it is an object of the present invention to provide a polypropylene resin composition which is excellent in rigidity, heat resistance and scratch resistance, has good workability, and is suitable for automobile interior parts and the like.

[0008]

Means for Solving the Problems The present inventors have made intensive studies to solve the above technical problems. as a result,
The present inventors have found that the above object can be achieved by blending talc subjected to a surface treatment with a polypropylene polymer and a specific additive, thereby completing the present invention.

That is, the present invention comprises 100 parts by weight of a polypropylene polymer, 5 to 50 parts by weight of a surface-treated talc, and 0.05 to 5 parts by weight of at least one additive selected from glycerin fatty acid monoester and fatty acid amide. It is a polypropylene resin composition characterized by containing.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION The polypropylene polymer used in the present invention is not particularly limited as long as it is a so-called hard plastic and is a crystalline polymer mainly composed of propylene. And a copolymer of α-olefins other than propylene, and a mixture of these polymers. The copolymer may be a random copolymer or a block copolymer.

The α-olefin is not particularly limited, and includes, for example, ethylene, 1-butene, 1-pentene, 1-hexene, 1-heptene, 1-octene and the like. Among them, ethylene is preferred. It is. Also the monomer unit amount based on α-olefin in the copolymer,
Although not particularly limited, generally, a range of 0.5 to 20% by weight is preferable.

Among these polymers, a propylene-ethylene block copolymer is preferred in view of the effects of the present invention.

The melt flow rate (hereinafter referred to as MFR) of the polypropylene polymer is not particularly limited, but is preferably from 5 to 80 g / 10 min in consideration of the moldability of the obtained composition. 10-70
g / 10 min is more preferable. The MFR in the present invention is a value measured at 230 ° C. according to JIS K7210.

The talc used in the present invention can be used without particular limitation as long as the talc has been subjected to a surface treatment for binding and / or adsorbing a treating agent to the talc surface.

As the treating agent for subjecting the talc to a surface treatment, known agents can be used without any limitation. For example, various organic titanate-based coupling agents, various organic silane-based coupling agents, various polysiloxane compounds,
Various surfactants, various silane compounds, metal soaps, higher alcohols, fatty acids, fatty acid metal salts, fatty acid esters, and other treating agents can be given. Among them, good rigidity, heat resistance and scratch resistance can be imparted. In view of this, an organic silane coupling agent and a polysiloxane compound are preferable, and a modified polysiloxane compound obtained from a silazane compound is more preferable.

As a method of the above-mentioned surface treatment, a known method, that is, a dry method or a wet method may be appropriately used.
More specifically, a dry method in which a surface treatment agent is directly sprayed or pulverized on a ground talc, or a wet method in which a talc and a treatment agent are stirred and treated at room temperature or under heating in a solvent such as water. And the like.

The treatment amount of the treatment agent is not particularly limited,
The amount is preferably 0.2 to 5 parts by weight, more preferably 0.3 to 3 parts by weight, and even more preferably 0.4 to 2 parts by weight based on 100 parts by weight of talc.

The average particle diameter of the talc is not particularly limited, but is preferably 0.5 μm to 7.0 μm in consideration of imparting good rigidity and heat resistance. , More preferably 1.0 µm to 6.0.
μm, and more preferably 2.0 μm to 5.0 μm. The average particle diameter in the present invention is a particle diameter value at a cumulative amount of 50% by weight measured by a laser diffraction / scattering method.

The amount of the surface-treated talc is 5 to 50 parts by weight, preferably 10 to 40 parts by weight, based on 100 parts by weight of the polypropylene polymer. When the amount of the surface-treated talc is less than 5 parts by weight, the effect of improving the rigidity and heat resistance of the obtained composition is small, such being undesirable. If the amount is more than 50 parts by weight, the resulting composition has poor scratch resistance, which is not preferable.

It is necessary that the polypropylene resin composition of the present invention contains at least one additive selected from glycerin fatty acid monoester and fatty acid amide, in addition to the polypropylene polymer and the surface-treated talc. It is.

The glycerin fatty acid monoester used in the present invention has the general formula

[0022]

Embedded image (Wherein, R represents an alkyl group or an alkenyl group having 10 to 21 carbon atoms), and specifically, glycerin laurate monoester, glycerin silistinic acid monoester, glycerin palmitic acid Monoester, glycerin stearic acid monoester and the like can be mentioned. Among them, the fatty acid amide used in the present invention, in which glycerin stearic acid monoester is preferable, has a general formula

[0023]

Embedded image (Wherein, R represents an alkyl group or an alkenyl group having 6 to 21 carbon atoms), and specific examples thereof include oleamide, erucamide, and stearamide. Of these, oleic acid amide and erucic acid amide are preferred.

The above-mentioned glycerin fatty acid monoester and fatty acid amide may be used alone or in combination of two or more.

The amount of these additives is 0.05 to 5 parts by weight, preferably 0.1 to 4 parts by weight, more preferably 0.2 to 3 parts by weight, based on 100 parts by weight of the polypropylene polymer. Parts by weight. When the amount is less than 0.05 part by weight, the effect of improving the scratch resistance is small, and
If the amount is more than 5 parts by weight, not only the rigidity and heat resistance of the obtained composition are reduced, but also mold stains due to bleed-out and stickiness of the molded product surface become problems.

The polypropylene resin composition of the present invention may further contain, for example, calcium carbonate, clay, silica, magnesium carbonate, barium sulfate, aluminum hydroxide, magnesium hydroxide, magnesium hydroxide, as long as the effects of the present invention are not impaired. Inorganic fillers such as lastonite, magnesium oxysulfate, fibrous potassium titanate, wood flour,
Additives such as rice husk powder, organic fillers such as cellulose, stabilizers, antistatic agents, release agents, foaming agents, pigments, nucleating agents, flame retardants, ultraviolet absorbers, plasticizers, decomposers, etc. as appropriate Is also good.

In the present invention, considering that a composition having both good impact resistance and good scratch resistance is obtained, it is preferable to further blend a thermoplastic elastomer with the polypropylene resin composition.

The above-mentioned thermoplastic elastomer has rubber elasticity at normal temperature, unlike the above-mentioned polypropylene-based polymer, and in the present invention, known ones can be used without any limitation. Specifically, for example, ethylene / propylene copolymer elastomer, ethylene / 1
Olefin elastomers such as butene copolymer elastomer, ethylene / 1-hexene copolymer elastomer, ethylene / 1-octene copolymer elastomer, ethylene / propylene / diene copolymer elastomer; styrene / butadiene copolymer elastomer, Styrene / butadiene / styrene copolymer elastomer, styrene
Styrene-based elastomers such as isoprene-styrene copolymer elastomers; or copolymers obtained by hydrogenating these elastomer components, for example, styrene-ethylene-butylene-styrene copolymer elastomers, and these can be used alone. They may be used alone or in combination of two or more.

Among these, ethylene / propylene copolymer elastomer, ethylene / 1-butene copolymer elastomer, ethylene / 1-octene copolymer elastomer, styrene / ethylene / butylene / styrene copolymer elastomer are preferable. 1-octene copolymer elastomer, styrene / ethylene / butylene /
Styrene copolymer elastomers are more preferred.

The MFR of the thermoplastic elastomer is not particularly limited, but is preferably 0.1 to 30 g / 10 min, more preferably 0.5 to 20 g / 10 min.
By using the one having an MFR of 0.1 g / 10 min or more, uniform dispersion in the polypropylene-based resin composition becomes possible, and the MFR is 30 g / 10 m
The impact strength can be sufficiently improved by using a material having a thickness of in or less.

The blending amount of the thermoplastic elastomer is not particularly limited. However, in consideration of imparting good impact resistance and scratch resistance, the polypropylene polymer 1
8 to 40 parts by weight, preferably 10 to 10 parts by weight,
30 parts by weight is more preferable, and 12 to 24 parts by weight is further preferable.

As a method for producing the polypropylene resin composition of the present invention, a known method may be appropriately employed. For example, a method of mixing the above-mentioned components with a tumbler or Henschel mixer, a single screw extruder, Examples of the method include a method using a melt kneader such as a screw extruder, a Banbury mixer, a kneader, and a roll.

The mixing of the components may be carried out simultaneously or separately. As a method of the division mixing, for example, a talc high filling master batch in which a polypropylene polymer is filled with talc at a high concentration, or a master in which a polypropylene polymer is filled with 10 to 40 wt% of glycerin fatty acid monoester and / or fatty acid amide A method of preparing a batch, melting and kneading it with the remaining components, and the like can be given.

The polypropylene resin composition of the present invention comprises:
By a generally adopted molding method, it can be molded into a desired shape without any limitation.

[0035]

EXAMPLES The present invention will be described more specifically with reference to examples and comparative examples, but the present invention is not limited to these examples. In addition, the symbol shown in the Example and the comparative example respectively shows the following.

1. Polypropylene-based polymer A-1: a propylene / ethylene block copolymer having an MFR of 30 g / 10 min and a monomer unit based on ethylene of 9.2% by weight

2. Talc B-1: a talc B-2 having an average particle size of 3.7 μm, which has been subjected to a surface treatment with a silazane-modified polysiloxane (treated by spraying a treating agent after pulverization, treatment amount: 0.8 wt%). Talc having an average particle size of 3.7 μm B-3: 3.7 μm average particle size, which was surface-treated with aminopropyltriethoxysilane (processed by spraying a treating agent after pulverization, treatment amount: 0.7 wt%). Unprocessed talc

3. Fatty acid amide D-1: erucamide D-2: oleic amide

4. Glycerin fatty acid monoester C-1: glycerin stearic acid monoester

5. Thermoplastic elastomer E-1: MFR 2g / 10min, density 0.87g
/ Cm ² ethylene / 1-octene copolymer

Examples 1 to 5 (1) Preliminary mixing A polypropylene polymer, talc, glycerin fatty acid monoester and 0.3 parts by weight of carbon black having the properties and ratios shown in Table 1 were blended and mixed with a Henschel mixer. .

(2) Pelletization The obtained resin composition was melt-kneaded with a twin-screw extruder to produce pellets.

(3) Preparation of Test Piece A test piece was prepared by using an injection molding machine using the pellet. The resin temperature was 210 ° C and the mold temperature was 40 ° C.

(4) Test method 1) Flexural modulus: Measured according to JIS K7203.

2) Deflection temperature under load: JIS K 720
7 (stress: 0.45 MPa).

3) Izod impact value: JIS K71
It measured according to 10.

4) Scratch resistance: 80 mm having a textured surface
A flat plate of × 50 mm × 2 mm (thickness) is formed, a 0.5 mm hemispherical steel bar is subjected to a load of 500 g using a cross-cut tester manufactured by Yasuda Seiki Seisaku-sho, and a grid pattern is formed on the grain surface at 2 mm intervals. Scratched. After that, Suga Test Machine SM-
The lightness difference (ΔL) before and after the test was measured by 3-HV.

5) Bleed-out of molded article: A flat plate having a mirror surface of 80 mm x 50 mm x 2 mm (thickness) was formed, annealed at 120 ° C for 3 days, and visually inspected for bleed-out on the surface of the plate. Observed.

The results are shown in Table 1.

Examples 6 and 7 Except that the fatty acid amides shown in Table 1 were included in place of the glycerin fatty acid monoester in the proportions shown in Table 1,
In the same manner as in Example 1, premixing, pelletization, preparation of a test piece, and a test method were performed. The test results are shown in Table 1.

[0051]

[Table 1]

As shown in Table 1, the polypropylene resin composition of the present invention is a resin composition having excellent rigidity, heat resistance and scratch resistance.

Comparative Examples 1 and 2 The procedure of Example 1 was repeated except that no glycerin fatty acid monoester was added.
Pelletization, preparation of test pieces and test methods were performed. The test results are shown in Table 2.

Comparative Examples 3 and 4 and Comparative Examples 8 and 9 The same procedures as in Example 1 were carried out except that the polypropylene polymer, talc and glycerin fatty acid monoester shown in Table 2 were blended in the proportions shown in Table 2. In the same manner, premixing, pelletization, preparation of a test piece, and a test method were performed. The test results are shown in Table 2.

Comparative Examples 5 and 6 In Example 6, premixing was carried out in the same manner as in Example 6, except that the polypropylene polymer, talc and fatty acid amide shown in Table 2 were blended in the proportions shown in Table 2. Pelletization, preparation of test pieces and test methods were performed. The test results are shown in Table 2.

Comparative Example 7 Premixing, pelletization, preparation of a test piece, and a test method were carried out in the same manner as in Example 1 except that talc not subjected to a surface treatment was used. The test results are shown in Table 2.

[0057]

[Table 2]

As shown in Table 2, a resin composition outside the range specified in the present invention does not satisfy at least one of physical properties such as rigidity and heat resistance and scratch resistance.

Examples 8 and 9 Premixing, pelletization, preparation of test pieces and test methods were carried out in the same manner as in Example 1 except that the thermoplastic elastomer was contained in the proportions shown in Table 1. . The test results are shown in Table 1.

[0060]

[Table 3]

As shown in Table 3, by further using a thermoplastic elastomer, a resin composition having excellent impact resistance and scratch resistance can be obtained.

[0062]

According to the present invention, it is possible to obtain a polypropylene resin composition which is superior in rigidity, heat resistance and scratch resistance as compared with conventional polypropylene resin compositions.

Therefore, the polypropylene-based resin composition of the present invention can be used for an instrument panel, a column cover, a trim, a glove box,
It can be widely applied to automotive interior parts such as pillars and console boxes.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification code FI Theme coat ゛ (Reference) C08L 21/00 C08L 21/00

Claims (2)

[Claims] 1. A composition comprising 100 parts by weight of a polypropylene polymer, 5 to 50 parts by weight of a surface-treated talc, and 0.05 to 5 parts by weight of at least one additive selected from glycerin fatty acid monoester and fatty acid amide. A polypropylene resin composition characterized by the above-mentioned. 2. The propylene resin composition according to claim 1, further comprising 8 to 40 parts by weight of a thermoplastic elastomer based on 100 parts by weight of the polypropylene polymer.