KR101466892B1 - Thermoplastic resin composition and resin article - Google Patents

Abstract

The present invention relates to a polycarbonate resin composition comprising: a polycarbonate resin; An ethylene-propylene copolymer having a Mooney viscosity (ML1 + 4, 100 占 폚) of at least 60; An ethylene-propylene-non-conjugated diene terpolymer having a Mooney viscosity (ML1 + 8, 125 DEG C) of at least 100; And a carbon fiber; and a resin molded article produced from the thermoplastic resin composition.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a thermoplastic resin composition,

More particularly, the present invention relates to a thermoplastic resin composition capable of providing a resin molded article having a high esthetic feeling by realizing a low gloss characteristic while having excellent mechanical properties and processability, and to provide a thermoplastic resin composition And a resin molded article obtained therefrom.

Recently, as interest in the design of various industrial products such as automobiles and electronic products has increased, a method of imparting aesthetics by using plastic having low gloss characteristics for manufacturing interior / exterior materials of automobiles and exterior materials of electronic products is applied .

Examples of the method of imparting low gloss characteristics using such a plastic include a method of mechanically texturing the surface of the plastic, a method of coating with a matte paint or a method of using a resin composition of low gloss .

Among them, the mechanical texturing method and the matte paint coating method for the plastic surface require not only a low production efficiency because of additional processing after the molding process of the resin composition, but also a low gloss characteristic disappears . Therefore, it is preferable to use a resin composition having a low gloss level so that low-gloss characteristics can be exhibited without further processing.

In this connection, attempts have been made to lower the gloss of the resin composition itself by incorporating a polycarbonate resin known as excellent in mechanical properties as a base resin and adding a quencher thereto.

However, inorganic quenching agents such as silica, talc, and glass fiber have not only a sufficient quenching effect but also deteriorate workability and breakage. Organic quenching agents such as siloxane and crosslinked acrylate are being applied instead of such inorganic quenching agents. However, organic quenching agents are limited in commercial application because they are expensive, and their mechanical properties are deteriorated with the addition of organic quenchers .

Korean Patent No. 0361631 discloses a polycarbonate resin composition comprising a polycarbonate, a modified olefin rubber and a linear or branched fatty acid ester. The resin composition has high flexibility and fluidity and is easily applied to various molded articles .

Korean Patent Registration No. 0722149 relates to a polycarbonate thermoplastic resin composition containing a polycarbonate resin, a rubber-modified vinyl-based graft copolymer, a non-linear vinyl copolymer, a phosphorus-based flame retardant and a fluorinated polyolefin resin. When the composition is used, the extrusion processability can be enhanced and the impact resistance of the final product can be improved.

Korean Patent No. 0709878 relates to a resin composition comprising a polycarbonate resin, a polyester resin, a core-shell graft impact modifier, and a branched graft impact modifier. The resin composition is required to have excellent impact resistance and fluidity And can be applied to the manufacture of various molded articles such as portable mobile communication devices, precision electric / electronic parts, and automobile precision parts.

Previously known methods, such as the above-mentioned Korean Patent No. 3, are characterized in that various polymer resins or additives are applied with a view to improving flexibility, workability and mechanical properties of a resin composition containing a polycarbonate resin.

However, there is no known method which can sufficiently improve the appearance characteristics of the resin molded article or significantly reduce the glossiness while sufficiently securing flexibility, workability and mechanical properties.

Korea Patent No. 0361631 Korean Patent No. 0722149 Korean Patent No. 0709878

The present invention provides a thermoplastic resin composition capable of providing a molded resin article having a high esthetic feeling by realizing a low gloss characteristic while having excellent mechanical properties and processability.

The present invention also provides a resin molded article containing the thermoplastic resin composition.

The present invention relates to a resin composition comprising 70 to 95% by weight of a polycarbonate resin; 0.1 to 10% by weight of an ethylene-propylene copolymer having a Mooney viscosity (ML1 + 4, 100 占 폚) of at least 60; 0.1 to 10% by weight of an ethylene-propylene-non-conjugated diene terpolymer having a Mooney viscosity (ML1 + 8, 125 DEG C) of at least 100; And 0.1 to 20% by weight of carbon fibers.

The present invention also provides a resin molded article comprising the thermoplastic resin composition.

Hereinafter, the thermoplastic resin composition and the resin molded article according to the specific embodiment of the present invention will be described in more detail.

According to one embodiment of the invention, 70 to 95% by weight of a polycarbonate resin; 0.1 to 10% by weight of an ethylene-propylene copolymer having a Mooney viscosity (ML1 + 4, 100 占 폚) of at least 60; 0.1 to 10% by weight of an ethylene-propylene-non-conjugated diene terpolymer having a Mooney viscosity (ML1 + 8, 125 DEG C) of at least 100; And carbon fibers in an amount of 0.1 to 20% by weight based on the total weight of the thermoplastic resin composition.

The present inventors have found that a thermoplastic resin composition produced by adding and mixing a carbon fiber together with a specific ethylene-propylene copolymer and an ethylene-propylene-non-conjugated diene terpolymer to a polycarbonate resin has excellent mechanical properties and processability It is possible to provide a resin molded article having a high esthetic feeling by realizing a low gloss characteristic while confirming through experiments that the invention has been completed.

The thermoplastic resin composition and the resin molded product containing the same have high flexibility and molding processability, and have physical properties such as tensile properties, flexural modulus, impact strength and heat resistance, which are equal to or higher than those of polycarbonate materials previously known, And can have a low surface gloss.

Specifically, the thermoplastic resin composition and the resin molded article containing the thermoplastic resin composition may have a surface gloss of 30% or less, or 25% or less, and preferably 20% or less according to ISO 2813 (60 degrees).

An ethylene-propylene copolymer having a Mooney viscosity (ML1 + 4, 100 ° C) of at least 60 and an ethylene-propylene-nonconjugated diene terpolymer having a Mooney viscosity (ML1 + 8, 125 ° C) A resin composition or a resin molded product produced by mixing with the polycarbonate resin and the carbon fiber can have physical properties such as high tensile strength, flexural strength, flexural elasticity and heat distortion temperature, The strength can be greatly improved.

By using the specific ethylene-propylene copolymer and the ethylene-propylene-non-conjugated diene terpolymer, the thermoplastic resin composition has excellent appearance characteristics and low glossiness A molded article can be provided.

On the other hand, the carbon fibers have high compatibility with the polycarbonate resin, the specific ethylene-propylene copolymer and the ethylene-propylene-non-conjugated diene terpolymer. In addition, as the carbon fiber is included, the thermoplastic resin composition can improve the appearance characteristics and lower the glossiness without deteriorating physical properties such as tensile strength, flexural strength, flexural elasticity, and heat distortion temperature. That is, the above-mentioned characteristic of the thermoplastic resin composition is that the carbon fiber is added and mixed with the polycarbonate resin together with the specific ethylene-propylene copolymer and the ethylene-propylene-non-conjugated diene terpolymer.

On the other hand, the polycarbonate resin is used as a base resin of the thermoplastic resin composition for securing basic physical properties, mechanical properties, processability, and the like of the composition.

As the polycarbonate resin, a conventional polycarbonate resin known in the art can be used without any particular limitation. However, according to the present invention, the polycarbonate resin may be a polymer containing a repeating unit represented by the following formula (1):

[Chemical Formula 1]

In formula (1), R ¹ is an aliphatic, alicyclic or aromatic organic radical and may have a structure -A ¹ -Y ¹ -A ² -, wherein A ¹ and A ² each independently represent an alkyl group having 1 to 20 carbon atoms Alkylne, Alkylene having 2 to 20 carbon atoms, cycloalkylene having 4 to 20 carbon atoms, or arylene having 6 to 20 carbon atoms; The Y ¹ may be a bridge radical, and may be a hydrocarbon group such as methylene, cyclohexylidene, or isopropylidene.

The term "alkylene" as used herein means a divalent functional group derived from a linear or branched alkane, and "Alkylene" means a functional group derived from a linear or branched alkene 'Cycloalkylne' means a divalent functional group derived from cycloalkane, 'arylene' means a divalent functional group derived from arene, .

The polycarbonate resin may be a linear polycarbonate, a branched polycarbonate, or a blend thereof.

The polycarbonate resin may have a weight average molecular weight of from 5,000 to 50,000, or from 15,000 to 35,000, in order to ensure the properties as a base resin, that is, basic physical properties, mechanical properties, processability and the like.

The polycarbonate resin may be contained in an amount sufficient to provide a balance as a base resin, but may be included to such an extent that sufficient low-gloss characteristics can be exhibited by interaction with other components. For example, the thermoplastic resin composition may include 70 to 95% by weight, or 85 to 92% by weight of the polycarbonate resin.

The ethylene-propylene copolymer may have a Mooney viscosity (ML1 + 4, 100 DEG C) of at least 60 or more and preferably 60 to 75, more preferably 65 to 75, 75 (ML1 + 4, 100 占 폚). That is, when the ethylene-propylene copolymer has a Mooney viscosity (ML1 + 4, 100 ° C) of less than 60, the gloss of the molded article is increased and the low-gloss characteristics are hardly manifested, and a peeling phenomenon may appear on the surface of the molded article.

The ethylene-propylene copolymer may be synthesized by copolymerization using an ethylenic monomer and a propylene-based monomer, and thus the copolymer may include an ethylene repeating unit and a propylene repeating unit. Specifically, the ethylene-propylene copolymer contains 60 to 75% by weight of ethylene repeating units; And 25 to 40% by weight of propylene repeating units.

The ethylene-propylene-non-conjugated diene terpolymer may have a Mooney viscosity (ML1 + 8, 125 ° C) of at least 100 or more and preferably 100 to 125, And more preferably from 105 to 120 (ML1 + 8, 125 DEG C). That is, when the ethylene-propylene-non-conjugated diene terpolymer has a Mooney viscosity (ML1 + 8, 125 ° C) of less than 100, the gloss of the molded article becomes high and it is difficult to exhibit low gloss characteristics, May appear.

The ethylene-propylene-nonconjugated diene terpolymer can be synthesized by copolymerization using an ethylenic monomer, a propylene-based monomer, and a nonconjugated diene-based monomer, and thus the copolymer has an ethylene repeating unit, a propylene repeating unit, And may contain an acryl-based monomer. Specifically, the ethylene-propylene-non-conjugated diene terpolymer has 50 to 80% by weight of ethylene repeating units; 5 to 45% by weight of propylene repeating units, and 1 to 20% by weight of nonconjugated diene repeating units.

The nonconjugated diene means a diene monomer having a chemical structure in which two or more single bonds are present between two double bonds, and the nonconjugated diene has a double bond in the chemical structure The nature does not change even if it changes.

Examples of nonconjugated dienes that can be used in the synthesis of the ethylene-propylene-nonconjugated diene terpolymer include dicyclopentadiene, ethylidene norbornene, and 1,4-hexadiene. Specifically, an ethylidene norbornene compound such as 5-ethylidene-2-norbornene (ENB) may be used as the nonconjugated diene.

Wherein the thermoplastic resin composition is an ethylene-propylene copolymer having a Mooney viscosity (ML1 + 4, 100 DEG C) of at least 60 and an ethylene-propylene-nonconjugated diene terpolymer having a Mooney viscosity (ML1 + 8, 125 DEG C) In an amount of 0.1 to 10% by weight, or 1 to 5% by weight.

The specific ethylene-propylene copolymer and the ethylene-propylene-nonconjugated diene terpolymer were each added in an amount of 0.1% by weight, in order to compensate for the mechanical properties, thermal properties and processability of the polycarbonate resin and to exhibit sufficient low- By weight or more. In addition, when each of the specific ethylene-propylene copolymer and the ethylene-propylene-non-conjugated diene terpolymer is added in an excess amount, the physical properties and uniformity of the thermoplastic resin composition may be lowered, Can be degraded.

The carbon fibers may have a length of 0.1 mm to 20 mm, or 1 to 10 mm. The carbon fibers may have a cross-sectional diameter of 0.1 to 20 탆, or 1 to 10 탆. Such carbon fibers can be obtained by firing polyacryonitrile (PAN) fibers or pitch fibers at 1000 to 3000 占 폚. As described above, the carbon fiber has high compatibility with other components of the thermoplastic resin composition, and the thermoplastic resin composition is excellent in tensile strength, bending strength, flexural elasticity, heat distortion temperature and impact strength without deteriorating physical properties , The appearance characteristics can be improved and the glossiness can be lowered.

At least one polymer selected from the group consisting of a polyester resin and a polyurethane resin may be bonded to the surface of the carbon fiber.

Since the carbon fiber contains carbon as a main component, the carbon fiber may have low reactivity and adhesion with the polymer. Accordingly, the thermoplastic resin composition of one embodiment of the present invention may include carbon fibers in which at least one polymer selected from the group consisting of a polyester resin and a polyurethane resin is bonded to the surface. Accordingly, the carbon fibers may have high compatibility, adhesiveness, and reactivity with respect to the polycarbonate resin, the ethylene-propylene copolymer and the ethylene-propylene-non-conjugated diene terpolymer.

The carbon fiber may include 0.01 to 10% by weight of at least one polymer selected from the group consisting of a polyester resin and a polyurethane resin. The polymer is bonded to the surface of the carbon fiber at an excessively low content, and the effect of improving the compatibility, adhesion and reactivity described above may be insignificant. Further, when the polymer is bonded to the surface of the carbon fiber at an excessively high content, the physical properties of the carbon fiber itself or the resulting effect may not be easily exhibited.

The polyester resin and the polyurethane resin may have a weight average molecular weight of 500 to 50,000.

The thermoplastic resin composition may further comprise 1 to 15% by weight of at least one polymer selected from the group consisting of an acrylonitrile-butadiene-styrene copolymer and an aromatic vinyl copolymer.

The acrylonitrile-butadiene-styrene copolymer (hereinafter referred to as 'ABS resin') and the aromatic vinyl copolymer are components that can be added to complement the mechanical properties, thermal properties, and processability of the above-mentioned polycarbonate resin, Can be used together with a specific ethylene-propylene copolymer, an ethylene-propylene-non-conjugated diene terpolymer and a carbon fiber to improve the physical properties and glossiness of the thermoplastic resin composition and the resin molded article produced therefrom .

The ABS resin may be copolymerized with a vinyl cyanide compound (e.g., acrylonitrile, methacrylonitrile and the like) in the presence of a diene rubber (e.g., polybutadiene, butadiene-styrene copolymer, butadiene- Means a graft copolymer obtained by polymerizing an aromatic vinyl compound (such as styrene, alpha-methylstyrene, dimethylstyrene, vinyltoluene).

Although the ABS resin contained in the thermoplastic resin is not limited to a great extent, it is advantageous to use an ABS resin having a diene rubber content of 50% by weight or more, preferably 55 to 65% by weight in terms of securing impact resistance and workability have.

The aromatic vinyl copolymer may be a polymer prepared using a monovinyl aromatic hydrocarbon, and may include a styrene copolymer. Such aromatic vinyl copolymers include, as comonomers, vinyl monomers such as ethylene, propylene, butene, pentene and the like; Acrylic monomers such as (meth) acrylonitrile, alpha-chloro (meth) acrylonitrile, methyl (meth) acrylate, ethyl (meth) acrylate and butyl (meth) acrylate; Maleic anhydride such as maleimide, N-alkyl maleimide, N-aryl maleimide and the like.

Specifically, the aromatic vinyl copolymer may include a styrene-acrylonitrile copolymer. The content of the comonomer contained in the aromatic vinyl copolymer may be controlled according to the physical properties required for the copolymer. In the case of the styrene-acrylonitrile copolymer, it is preferable that 60 to 90% by weight of styrene and 10 to 40% by weight of acrylonitrile are contained in terms of manifesting effects such as mechanical properties, thermal properties and workability of the polycarbonate resin Do.

The one or more polymers selected from the group consisting of the ABS resin and the aromatic vinyl copolymer may be used in an amount of 1 to 15% by weight, preferably 1 to 10% by weight, more preferably 2 to 8% by weight, As shown in FIG. That is, in view of manifesting effects such as mechanical properties, thermal properties and workability of the polycarbonate resin, it is advantageous that the polymer is contained in an amount of 1% by weight or more. If the polymer is added in an excess amount, the overall physical properties of the composition may be lowered. To prevent this, it is advantageous that the polymer is contained in an amount of 15 wt% or less.

The thermoplastic resin composition may further contain additives such as a quencher, a UV stabilizer, a heat stabilizer, a plasticizer, a releasing agent, a colorant, an antistatic agent, a flame retardant, a fluorescent whitening agent, and an impact modifier in addition to the above components.

As described above, the thermoplastic resin composition can attain an excellent light extinction effect by including the carbon fiber together with the specific ethylene-propylene copolymer and the ethylene-propylene-non-conjugated diene terpolymer, And a quencher known to be capable of having low gloss, but additionally commonly used.

The thermoplastic resin composition may further include a quencher, which is known to be generally usable. Examples of the quencher include an inorganic quencher such as silica, talc, glass fiber and the like; Organic quencher such as siloxane, crosslinked acrylate and the like may be added. However, when the inorganic quencher is added in an excessive amount, the processability of the composition may be deteriorated and breakage may occur. If the organic quencher is added in an excessive amount, the manufacturing cost may increase, and the mechanical properties of the composition may be deteriorated. Therefore, it is preferable that the quencher is contained in an amount of 0.1 to 5% by weight based on the total weight of the composition.

Additives such as an ultraviolet stabilizer, a heat stabilizer, a plasticizer, a releasing agent, a colorant, an antistatic agent, a flame retardant, a fluorescent whitening agent, and an impact modifier can be used. As a result, It may be added within a range not exceeding the above range.

On the other hand, the production of the thermoplastic resin composition can be carried out by any suitable mixing means known in the art. For example, the thermoplastic resin composition may be prepared by preliminarily mixing each of the above-mentioned components with a mixing device such as a Hensel mixer, a tumbler, a ribbon blender, a high-speed mixer, and then melt-kneading the mixture with an extruder or the like. The resin composition may be provided in the form of pellets.

On the other hand, according to another embodiment of the present invention, a resin molded article comprising the above-mentioned thermoplastic resin composition can be provided.

As described above, when a thermoplastic resin composition prepared by adding and mixing carbon fibers together with the above-mentioned specific ethylene-propylene copolymer and ethylene-propylene-non-conjugated diene terpolymer to a polycarbonate resin is used, excellent mechanical properties and It is possible to provide a resin molded article having a high esthetic feeling by realizing a low gloss characteristic while having processability.

Particularly, the resin molded article comprising the thermoplastic resin composition has high flexibility and moldability, and has physical properties such as tensile properties, flexural modulus, impact strength, and heat resistance, while securing a level equal to or higher than that of a previously known polycarbonate- It can have a relatively low surface gloss.

Specifically, the resin molded article may have a surface gloss of 30% or less, or 25% or less, and preferably 20% or less according to ISO 2813 (60 degrees).

The production of the resin molded article can be carried out using the resin composition described above and any suitable molding means known in the art. For example, the resin molded article can be produced by molding the resin composition by injection molding, extrusion molding, blow molding, press molding, calender molding or the like. However, since the resin composition has hygroscopicity, it is preferable to carry out the molding step in a sufficiently dried state.

Such a resin molded article can be produced by using the resin composition described above and can have a smooth surface free from the peeling phenomenon and exhibits excellent mechanical properties. In addition, it can exhibit sufficient low-gloss characteristics Lt; / RTI >

The resin molded article may have a tensile strength of 400 to 600 kgf / cm 2, a flexural modulus of 20,000 to 35,000 kgf / cm 2, and an impact strength of 5 to 30 kgcm / cm.

The resin molded article can be used as a matte reflector of an image display device such as an electric signboard, an automobile interior / exterior material, an LCD or an LED, or a matte reflector of a lighting device.

INDUSTRIAL APPLICABILITY According to the present invention, there can be provided a thermoplastic resin composition capable of providing a resin molded article having a high esthetic feeling by realizing a low gloss characteristic while having excellent mechanical properties and processability, and a resin molded article obtained from such a thermoplastic resin composition.

The thermoplastic resin composition and the resin molded article have excellent appearance characteristics and low glossiness while sufficiently ensuring physical properties such as tensile strength, flexural strength, flexural elasticity, heat distortion temperature and impact strength, and are excellent in electric signboards, automotive interior / exterior materials, An LED light-reflecting plate of a video display device, a matt reflection plate of a lighting device, and the like.

The invention will be described in more detail in the following examples. However, the following examples are illustrative of the present invention, and the present invention is not limited by the following examples.

< Example  And Comparative Example : Production of thermoplastic resin composition and resin molded article>

The resin compositions of Examples and Comparative Examples were prepared by mixing the components shown in Tables 1 to 2 below (content unit: wt%). Here, the specific contents of each component are as follows.

[Ingredients Used]

1) PC: Polycarbonate resin (weight average molecular weight: 25,000, manufacturer: Lotte Chemical, product name: PC-1100S)

2) EPM: ethylene-propylene copolymer (pattern viscosity: 69 (ML1 + 4, 100 캜), ethylene content: 70.5% by weight, manufactured by Kumho Polychem, product name: KEP-070P)

3) EPDM: ethylene-propylene- (5-ethylidene-2-norbornene) terpolymer (having a pattern viscosity of 115 (ML1 + 8, 125 ° C), ENB content of 7% by weight, ethylene content of 70% Manufacturer: Kumho Polychem, product name: KEP-2371)

4) Carbon fiber: PAN-based carbon fiber, Polyester binder, 6 mm in length, 7 μm in diameter [Taekwang Industrial, TKS40]

5) ABS: acrylonitrile-butadiene-styrene copolymer (butadiene content 60% by weight, manufacturer: Kumho Petrochemical, product name: ABS 181)

6) g-SAN: a grafted SAN (manufactured by Chemtura, product name: B-MAT)

7) Silica: Extinguishing agent (Manufacturer: Eskemec)

8) g-MMA: crosslinked acrylate (manufacturer: MRC, product name: F-410)

9) G / F: glass fiber (manufacturer: Owens Corning, product name: 473A)

[Experimental Method]

The resin compositions obtained by the above examples and comparative examples were respectively extruded using a twin-screw extruder (Model: TEM-26SS, manufactured by Toshiba), and then extrusion was carried out using an extruder (Model: 170MT, ). The prepared specimens were tested in the following manner, and the results are shown in Tables 1 to 2 below.

Experimental Example 1 : Surface gloss measurement

Surface polish according to ISO 2813 (60 degrees) was measured on a circular specimen with a diameter of 55 mm and a thickness of 3.2 mm using a gloss meter (model: REFO60, manufacturer: DRLANGE).

Experimental Example 2 : Measurement of mechanical properties

Tensile strength-yield stress according to ISO 37 (II) AStM D638, and flexural modulus and impact strength according to ASTM D790 were measured using a universal testing machine (Universal Materials Testing Machine, Instron).

Experimental Example 3 : Measurement of heat distortion temperature

A load of 6.4 18.6 kgf / cm 2 was applied to the specimen according to the method of ASTM D648 using a thermal deformation tester (model name: 6A-2, manufacturer: _Toyoseiki), the specimen was immersed in oil and preheated for about 5 minutes , And the temperature was measured when the swing length of the specimen was 0.254 mm while heating the oil at a rate of 120 ° C / h.

Experimental Example 4 : Impact strength measurement

The impact strength was measured according to the method of ASTM D256 using an IZOD impact tester (manufactured by Toyoseiki).

The specific composition of the thermoplastic resin compositions of Examples 1 to 5 and the physical properties of the resin molded articles prepared using the compositions Example 1 Example 2 Example 3 Example 4 Example 5 ingredient
(wt%) PC 91 85 83 78 88 Carbon fiber 5 5 5 5 5 EPM 2 5 3.5 3.5 3.5 EPDM 2 5 3.5 3.5 3.5 ABS 0 0 5 10 0 Properties Glossiness (%) 20.75 18.74 19.5 18.98 22.74 liquidity 14.13 15.5 11.4 7.8 17.4 density 1.1958 1.1688 1.1659 1.157 1.1875 Tensile Strength - Yield Stress
(kgf / cm2) 569 502 477 471 550 Flexural modulus (kgf / cm2) 29,500 26,400 25,800 28,600 30,000 Impact strength (kgcm / cm) 11.4 17.4 18 16.4 6.4 Heat deformation temperature (캜) 131 128.2 126.9 129.3 129.5 Shrinkage rate 0.72 0.64 0.64 0.6 0.67

The specific compositions of the thermoplastic resin compositions of Comparative Examples 1 to 7 and the physical properties of the resin molded articles prepared using the compositions Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Comparative Example 5 Comparative Example 6 Comparative Example 7 ingredient
(wt%) PC 97 95 95 95 95 93 95 Carbon fiber 3 EPM 0 0 0 0 3.5 0 EPDM 0 0 0 0 3.5 0 g-SAN 5 0 0 0 0 0 g-MMA 0 5 0 0 0 0 Silica 0 0 5 0 0 0 G / F 0 0 0 5 0 0 ABS 0 0 0 0 0 5 Properties Glossiness (%) 34 31.74 48.54 30.3 45.28 49.4 90.1 liquidity 14.1 14.8 14.6 23.3 14.5 15.8 13.8 density 1.2081 1.1832 1.1921 1.2155 1.2279 1.1715 1.1885 The tensile strength-
Yield stress
(kgf / cm2) 606 594 592 625 607 513 554 Flexural modulus
(kgf / cm2) 28,400 24,600 24,600 27,700 26,800 21,400 22,900 Impact strength (kgcm / cm) 9.9 18 13.2 5.7 8.6 62.6 63.6 Heat distortion temperature
(° C) 130.6 123.2 123.7 119.4 127.4 123.2 124.4 Shrinkage (MD) 0.79 0.78 0.8 0.65 0.78 0.79 0.83

As shown in Tables 1 and 2, the resin molded articles produced using the resin compositions of Examples 1 to 5 exhibited relatively low gloss, and had mechanical properties equal to or higher than those of the resin molded articles obtained in Comparative Examples, It is confirmed that it has characteristics.

Specifically, the resin molded articles produced using the resin compositions of Examples 1 to 5 had a gloss of 22.74 or less, a tensile strength of about 500 kgf / cm 2, a flexural modulus of about 25,000 to 30,000 kgf / It was confirmed that an impact strength of about 18 kgcm / cm was secured and a heat distortion temperature of 126 캜 or more was obtained.

On the contrary, it was confirmed that the resin molded articles obtained in Comparative Examples 1 to 7 had a glossiness of 30 or more, and the glossiness of the resin molded articles obtained in Comparative Examples 3, 5, 6 and 7 reached 45 or more. In addition, it was confirmed that the resin composition of the comparative example has a relatively low heat distortion temperature although a certain degree of mechanical properties can be secured.

Claims (15)

70 to 95% by weight of a polycarbonate resin;
0.1 to 10% by weight of an ethylene-propylene copolymer having a Mooney viscosity (ML1 + 4, 100 占 폚) of at least 60;
0.1 to 10% by weight of an ethylene-propylene-non-conjugated diene terpolymer having a Mooney viscosity (ML1 + 8, 125 DEG C) of at least 100; And
0.1 to 20% by weight of carbon fibers.
The method according to claim 1,
Wherein the polycarbonate resin has a weight average molecular weight of 5,000 to 50,000.
The method according to claim 1,
Wherein the ethylene-propylene copolymer has a Mooney viscosity (ML1 + 4, 100 DEG C) of 60 to 75.
The method according to claim 1,
The ethylene-propylene copolymer has 60 to 75% by weight of ethylene repeating units; And 25 to 40% by weight of a propylene repeating unit.
The method according to claim 1,
Wherein the ethylene-propylene-non-conjugated diene terpolymer has a Mooney viscosity (ML1 + 8, 125 DEG C) of 100 to 125.
The method according to claim 1,
The ethylene-propylene-non-conjugated diene terpolymer has 50 to 80% by weight of ethylene repeating units; 5 to 45% by weight of a propylene repeating unit, and 1 to 20% by weight of a nonconjugated diene repeating unit.
The method according to claim 1,
Wherein the carbon fibers have a length of 0.1 mm to 20 mm and a cross-sectional diameter of 0.1 to 20 μm.
The method according to claim 1,
Wherein at least one polymer selected from the group consisting of a polyester resin and a polyurethane resin is bonded to the surface of the carbon fiber.
The method according to claim 1,
Wherein the carbon fiber comprises a result of firing polyacrylonitrile fiber or pitch fiber at 1000 to 3000 占 폚.
The method according to claim 1,
Wherein the nonconjugated diene comprises at least one member selected from the group consisting of dicyclopentadiene, ethylidene norbornene and 1,4-hexadiene.
The method according to claim 1,
1 to 15% by weight of at least one polymer selected from the group consisting of acrylonitrile-butadiene-styrene copolymers and aromatic vinyl copolymers.
12. The method of claim 11,
Wherein the aromatic vinyl copolymer comprises a styrene-acrylonitrile copolymer.
The method according to claim 1,
Wherein the surface gloss according to ISO 2813 (60 degrees) is 25% or less.
A resin molded article comprising the thermoplastic resin composition of claim 1.
15. The method of claim 14,
The surface gloss according to ISO 2813 (60 degrees) is 25% or less,
A light-reflecting plate of an image display device, and a matte reflector of a lighting device.