KR101299316B1 - Polypropylene Resin Composition - Google Patents

Abstract

The present invention relates to a polypropylene resin composition, the polypropylene resin composition according to the present invention is a crystalline olefin resin; Polyolefin elastomers; Talc; And needle-shaped calcium meta-silicate filler, wherein the needle-shaped calcium meta-silicate filler is included in an amount of 3 to 30 parts by weight based on the polypropylene resin composition. The polypropylene resin composition according to the present invention provides excellent scratch resistance while maintaining excellent mechanical properties.
Therefore, the polypropylene resin composition according to the present invention can provide excellent surface properties with little damage to friction or impact, etc., so that the interior / exterior materials of automobiles can be manufactured only by the injection process without a separate scratch prevention process.

Description

Polypropylene Resin Composition < RTI ID = 0.0 >

The present invention relates to a polypropylene resin composition.

Conventional polypropylene resin composition has been used as a material for automotive interior / exterior materials due to excellent mechanical properties and the like. However, when used for such interior / exterior materials, the surface of the unpainted exterior material may be damaged due to the crushing of gravel, sand, and mechanical car wash while driving, and the surface of the interior material may be easily caused by the driver's or passenger's hands and shoes, etc. The problem of damage occurs. In order to prevent such surface damage, a method of coating the surface or wrapping the surface with polyurethane or the like is used, but such a method has problems such as cost increase of parts and difficulty of recycling. Accordingly, various methods have been studied for improving the surface performance of parts with only the polypropylene resin composition itself without coating and without surface wrapping.

As part of this research, there are methods of applying styrene ethylene-butylene crystalline block copolymer having excellent impact resistance and scratch resistance, or applying crystalline polypropylene resin or modified resin of a partial crosslinking system. However, these methods are difficult to apply to automotive interior materials or household goods because odors are generated in the process or the manufactured parts of the resin composition.

An object of the present invention for solving the above problems is to provide a polypropylene resin composition excellent in mechanical properties such as stiffness, impact resistance and shrinkage rate, scratch resistance is improved and excellent surface properties.

The present invention to achieve the above object,

Crystalline olefin resins which are single or a mixture thereof selected from the group consisting of isotactic polypropylene and alpha-olefin-propylene copolymers;

Polyolefin elastomers;

Talc; And

Comprising needle-shaped calcium meta-silicate fillers,

The acicular calcium meta-silicate filler relates to a polypropylene resin composition contained in an amount of 3 to 30 parts by weight based on the polypropylene resin composition.

The crystalline olefin resin may be included in 40 to 95 parts by weight based on the polypropylene resin composition.

The crystalline olefin resin may have a melt index of 10 to 80 (g / 10 min) (230 ° C.).

The polyolefin-based elastomer may be included in 3 to 30 parts by weight based on the polypropylene resin composition.

The polyolefin-based elastomer may have a melt index of 0.05 to 15.0 (g / 10 min) (230 ° C.).

The talc may be included in an amount of 3 to 30 parts by weight based on the polypropylene resin composition.

The alpha-olefin-propylene copolymer may be a single or a mixture thereof selected from the group consisting of propylene-ethylene copolymers, propylene-butene copolymers, propylene-hexene copolymers and propylene-methyl-pentene copolymers.

The polyolefin-based elastomers are ethylene propylene copolymer rubber, ethylene propylene dicyclo pentadiene rubber, ethylene propylene hexadiene rubber, ethylene propylene cyclopentadiene rubber, ethylene propylene methylene norbornene rubber, ethylene propylene ethylidene novoden rubber, ethylene butadiene copolymer It may be a single or a mixture thereof selected from the group consisting of polymer rubber and ethylene octadiene copolymer rubber.

The polypropylene resin composition may be used as a material for interior / exterior materials of automobiles.

The polypropylene resin composition according to the present invention is excellent in scratch resistance while maintaining mechanical properties such as impact resistance, rigidity and heat resistance, thereby reducing surface damage of a molded article due to impact, friction, and the like.

Therefore, the polypropylene resin composition according to the present invention does not need a separate scratch prevention coating process when manufacturing a molded article, and can simplify the manufacturing process, and can reduce the expensive silicone-based scratch additive used in the existing coating process. You can save money.

Hereinafter, the present invention will be described in detail so that those skilled in the art can easily practice.

The polypropylene resin composition of this invention contains crystalline olefin resin. The crystalline olefin resin can improve the flowability of the entire polypropylene resin composition, and can maintain the basic mechanical properties of the polypropylene resin composition, such as rigidity, heat resistance and heat deformation.

The crystalline olefin resin may be included in 40 to 95 parts by weight based on the polypropylene resin composition. Preferably 45 to 91 parts by weight may be included. When the crystalline olefin resin is included in less than 40 parts by weight, the moldability of the polypropylene resin composition is lowered, and when included in excess of 95 parts by weight, the mechanical properties of the polypropylene resin composition such as rigidity may be lowered.

Melt index of the crystalline olefin resin may be 10 to 80 g / 10min (ASTM D1238, 230 ℃), preferably 20 to 60 g / 10min.

When the melt index of the crystalline olefin resin is less than 10 g / 10 min, the fluidity of the polypropylene resin composition is lowered, so that injection molding is difficult, and when it exceeds 80 g / 10 min, a molded article made of the polypropylene resin composition The mechanical properties of may be lowered.

The crystalline olefin resin may be a single or a mixture thereof selected from the group consisting of isotactic polypropylene and alpha-olefin-propylene copolymers.

The alpha-olefin-propylene copolymer may be a single or a mixture thereof selected from the group consisting of propylene-ethylene copolymers, propylene-butene copolymers, propylene-hexene copolymers and propylene-methyl-pentene copolymers. Preferably, the alpha-olefin-propylene copolymer may use a propylene-ethylene copolymer. There is no restriction | limiting in the form of the said copolymer, Specifically, For example, a block copolymer, an alternating copolymer, or a random copolymer can be used.

The polypropylene resin composition of the present invention contains a polyolefin elastomer. The polyolefin-based elastomer provides elasticity and flexibility to the final product molded from the polypropylene resin composition and improves impact resistance.

The polyolefin-based elastomer may be included in 3 to 30 parts by weight based on the polypropylene resin composition. When the polyolefin-based elastomer is included in less than 3 parts by weight, the effect of improving the impact resistance of the molded article by the polypropylene resin composition is insignificant, and when included in excess of 30 parts by weight, the fluidity of the polypropylene resin composition is lowered, so that molding is difficult. And mechanical properties such as rigidity may be lowered.

Melt index of the polyolefin-based elastomer may be 0.05 to 15.0 g / 10min (ASTM D1238, 230 ℃). When the melt index of the polyolefin elastomer is less than 0.05 g / 10 min, the flowability of the polypropylene resin composition may be reduced, which may cause difficulty in injection processing. However, the mechanical properties of the molded article, in particular, room temperature and low temperature impact resistance may be lowered.

The polyolefin-based elastomers are ethylene propylene copolymer rubber, ethylene propylene dicyclo pentadiene rubber, ethylene propylene hexadiene rubber, ethylene propylene cyclopentadiene rubber, ethylene propylene methylene norbornene rubber, ethylene propylene ethylidene novoden rubber, ethylene butadiene copolymer It may be a single or a mixture thereof selected from the group consisting of polymer rubber and ethylene octadiene copolymer rubber.

The polypropylene resin composition of the present invention may include talc.

The talc improves the rigidity and heat resistance of the polypropylene resin composition.

The talc may be included in an amount of 3 to 30 parts by weight based on the polypropylene resin composition. When the talc is included in an amount less than 3 parts by weight, the effect of improving the rigidity and heat resistance of the polypropylene resin composition is insignificant. When the talc is included in an amount exceeding 30 parts by weight, the specific gravity of the polypropylene resin composition is increased to increase the weight of the final product. In addition, impact resistance of the polypropylene resin composition may be lowered and scratch resistance may be greatly reduced.

The talc may have a weight average diameter of 0.1 to 15 μm, and preferably 5 to 15 μm, measured by laser diffraction scattering. If the diameter is less than 0.1 μm, the production cost of the polypropylene resin composition is not high, and if it is more than 15 μm, the effect of increasing the rigidity, which is the purpose of talc filling, may be lowered.

The polypropylene resin composition according to the present invention may include a metal silicate filler.

The filler of the metal silicate system improves the scratch resistance and the odor of the polypropylene resin composition.

The metal silicate filler may be included in an amount of 3 to 30 parts by weight based on the polypropylene resin composition. When the filler of the metal silicate system is included in less than 3 parts by weight, the rigidity of the polypropylene resin composition is lowered, and when included in more than 30 parts by weight, the scratch resistance of the polypropylene resin composition is reduced again, Higher specific gravity may cause a problem that the weight of the final product increases.

The filler of the metal silicate system may be a single or a mixture thereof selected from the group consisting of aluminum silicate, calcium silicate, calcium metasilicate and magnesium silicate. Preferably, the filler of the metal silicate system may be acicular calcium metasilicate.

The polypropylene composition of the present invention may further include various additives, reinforcing materials, fillers and the like within the scope of not impairing the object of the present invention. Specifically, heat stabilizers, weather stabilizers, antistatic agents, lubricants, slip agents (SLIP agents), nucleating agents, flame retardants, calcium carbonate, mica, kaolin, clay, barium sulfate, calcium sulfate and the like can be added. The content of the component to be added can be appropriately adjusted by those skilled in the art within a range that does not impair the object of the present invention.

The polypropylene resin composition of the present invention can be used as a material for interior / exterior materials of automobiles.

The interior / exterior may be an automobile instrument panel, a pillar trim, a door trim, a bumper, a side mold, or the like.

Hereinafter, the present invention will be described in more detail with reference to Examples and Comparative Examples. This is for the purpose of illustrating the invention only, and thus the scope of the invention is not limited.

< Example  1 to 8>

In Table 1, each component was collectively added to the kneading extruder at the composition of Table 1 below. 　 Kneading to prepare a polypropylene resin composition of the present invention in the form of pellets. The units in Table 1 below are by weight.

ingredient Example
One Example
2 Example
3 Example
4 Example
5 Example
6 Example
7 Example
8 PP-1 54 30 37 30 30 25 17 20 PP-2 37 17 20 37 30 25 30 30 EP-1 3 20 20 10 10 10 - - EP-2 - - - 10 10 10 20 30 Talc-1 3 3 3 3 10 20 30 10 Needle Filler-1 3 30 20 10 10 10 3 10 system 100 100 100 100 100 100 100 100

PP-1: Propylene-ethylene copolymer having melt index of 15-30 g / 10min (230 ° C), ethylene unit content 5-20 mol%

PP-2: Propylene-ethylene copolymer with melt index of 30-50 g / 10min (230 ° C), ethylene unit content 5-20 mol%

EP-1: ethylene-propylene copolymer rubber, melt index 5.0-15.0 g / 10min (230 ° C)

EP-2: Ethylene-propylene copolymer rubber, melt index 0.05-1.5 g / 10min (230 ° C)

Talc-1: 10 micrometers of average particle diameters

Needle-shaped filler-1: calcium meta-silicate, needle-shaped, white

< Comparative Example  1 to 4>

To prepare a polypropylene resin composition in the form of pellets in the same manner as in the above Examples in the composition of Table 2. The unit in Table 1 below is weight percent.

ingredient Comparative Example
One Comparative Example
2 Comparative Example
3 Comparative Example
4 PP-1 38 30 20 30 PP-2 40 30 20 30 EP-1 - 10 10 10 EP-2 2 10 10 10 Talc-1 20 20 - 18 Needle Filler-1 - - 40 2 system 100 100 100 100

< Experimental Example > Specimen Fabrication and Property Evaluation

The polypropylene resin compositions prepared in Examples and Comparative Examples were dried in an oven at 80 ° C. for 2 hours in consideration of deterioration of physical properties due to moisture absorption. This composition was injection molded into a surface embossed plate sample for evaluation of physical properties and scratches using a normal injection machine (140 tons of clamping force).

In injection molding, the injection temperature is 30/200/200/200/200 ℃ from the feeding hopper to the nozzle, the mold temperature is 60 ℃ and the injection pressure is 60 to 100 bar. Produced.

Measurement of the physical properties of the propylene composition of each Example and Comparative Example was carried out in the same manner as Table 3, the results are shown in Table 4 and Table 5.

Test Items unit Experimental Method One liquidity g / 10min ASTM D-1238 2 density g / cm3 ASTM D-792 3 Tensile Strength (Yield Point) kg / ㎠ ASTM D-638 4 Flexural modulus kg / ㎠ ASTM D-790 5 Rockwell Hardness R-Scale ASTM D-785 6
IZOD impact strength Room temperature kgcm / cm ASTM D-256 -30 ℃ ASTM D-256 7 Exterior Scratch resistance
evaluation Upper, middle, lower Surface whitening visual evaluation (panel evaluation)

Test Items Example
One Example
2 Example
3 Example
4 Example
5 Example
6 Example
7 Example
8 liquidity 26.1 24.3 21.2 22.5 23.1 20.5 15.6 11.8 density 0.94 1.12 1.05 0.98 1.03 1.10 1.12 1.02 The tensile strength
(yield point) 269 200 193 195 194 193 190 150 Flexural modulus 17,100 21,000 17,300 13,500 16.100 20,200 21,400 12,140 Rockwell Hardness 91 60 50 50 48 46 44 30 Izod impact strength (room temperature) 9.5 44 49 48 50 51 51 65 Exterior Imagination Prize Imagination Imagination Prize slander medium Prize

Test Items Comparative Example
One Comparative Example
2 Comparative Example
3 Comparative Example
4 liquidity 23.7 18.9 12.9 14.5 density 1.04 1.03 1.17 1.04 The tensile strength
(yield point) 272 380 190 300 Flexural modulus 23,200 16,100 24,500 16,500 Rockwell Hardness 89 48 45 47 Izod impact strength (room temperature) 6.5 49 50 49 Exterior Ha Ha Medium Ha

As shown in Table 4 and Table 5, when the polypropylene composition of the present invention includes a needle-like calcium meta-silicate filler, it is confirmed that the mechanical properties such as impact resistance, stiffness, etc. are improved while scratch resistance is improved during injection. Can be.

In addition, Examples 3, 4 and 5 are presented as the content of the resin composition of a raw material for general automotive parts, and scratch resistance compared to Comparative Examples 1 and 2 containing only talc when acicular calcium meta-silicate filler is included. You can see that the improved sex.

Looking at Comparative Example 1, it can be seen that the impact strength is significantly reduced when the content of the polyolefin-based elastomer is out of the range suggested by the present invention.

As in Comparative Examples 3 to 4, when the content of acicular calcium meta-silicate filler is outside the range suggested in the present invention, it can be seen that the scratch resistance decreases and the density increases. Such an increase in density may cause problems such as an increase in the weight of the product and an increase in manufacturing cost.

Compared to the polypropylene resin composition containing talc and polyolefin elastomer, the polypropylene resin composition according to the present invention has improved scratch resistance and can maintain mechanical properties such as rigidity and impact resistance at a similar level.

The polypropylene resin according to the present invention can manufacture molded articles having excellent surface properties without post-processing such as painting and wrapping, so that the process can be simplified and the cost can be reduced.

Therefore, the polypropylene resin composition according to the present invention can produce an automotive interior / exterior material having excellent mechanical properties and scratch resistance in an economical manner.

Claims (10)

Crystalline olefin resins which are single or a mixture thereof selected from the group consisting of isotactic polypropylene and alpha-olefin-propylene copolymers;
Polyolefin elastomers;
Talc; And
Comprising needle-shaped calcium meta-silicate fillers,
The polyolefin-based elastomer is an ethylene-propylene copolymer rubber having a melt index of 0.05 to 1.5 g / 10 min (230 ° C., ASTM D1238) and an ethylene-propylene copolymer rubber having a melt index of 5.0 to 15.0 g / 10 min (230 ° C., ASTM D1238). Including,
The needle-shaped calcium meta-silicate filler is 3 to 30 parts by weight based on the polypropylene resin composition.
The method of claim 1,
The crystalline olefin resin is polypropylene resin composition, characterized in that contained in 40 to 95 parts by weight based on the polypropylene resin composition.
The method of claim 1,
The crystalline olefin resin is a polypropylene resin composition, characterized in that the melt index is 10 to 80 (g / 10min) (230 ℃, ASTM D1238).
The method of claim 1,
The polyolefin elastomer is 3 to 30 parts by weight based on the polypropylene resin composition.
delete The method of claim 1,
The talc is 3 to 30 parts by weight with respect to the polypropylene resin composition polypropylene resin composition.
The method of claim 1,
The average diameter of the talc is 0.1 to 15 ㎛ polypropylene resin composition.
The method of claim 1,
The alpha-olefin-propylene copolymer is a polypropylene, characterized in that a single or a mixture thereof selected from the group consisting of propylene-ethylene copolymer, propylene-butene copolymer, propylene-hexene copolymer and propylene-methyl-pentene copolymer Propylene Resin Composition.
The method of claim 1,
The polyolefin elastomers include ethylene propylene dicyclo pentadiene rubber, ethylene propylene hexadiene rubber, ethylene propylene cyclopentadiene rubber, ethylene propylene methylene norbornene rubber, ethylene propylene ethylidene novoden rubber, ethylene butadiene copolymer rubber and ethylene octadiene Polypropylene resin composition, characterized in that it further comprises a single or a mixture thereof selected from the group consisting of copolymer rubber.
The method of claim 1,
The polypropylene resin composition is a polypropylene resin composition, characterized in that used as a vehicle interior / exterior material.