KR101067141B1 - Environmentally Friendly Resin Composition - Google Patents

Abstract

 The present invention relates to an eco-friendly resin composition having excellent heat resistance and impact resistance, and uses polylactic acid resin, polycarbonate resin, and acrylonitrile-butadiene-styrene copolymer resin as a base resin, and MBS as polyethylene terephthalate resin and impact modifier. Carbodiimide type compounds are included as a copolymer and a hydrolysis agent.

Eco-friendly, polylactic acid, polycarbonate, ABS resin, polyethylene terephthalate, carbodiimide

Description

Eco-friendly resin composition {Environmentally Friendly Resin Composition}

The present invention relates to an environment-friendly resin composition excellent in heat resistance and impact resistance. More specifically, the present invention can reduce environmental pollution load, including environmentally friendly polylactic acid resin, polycarbonate resin, acrylonitrile-butadiene-styrene copolymer resin, polyethylene terephthalate and impact modifier, hydrolysis agent In addition, the present invention relates to an environment-friendly resin composition that can be usefully applied as a material for components such as automobile interior and exterior materials, housings of electrical and electronic devices, etc., because of excellent physical properties including heat resistance and impact resistance.

Plastic materials (PP, ABS, etc.) that use fossil resources such as petroleum and coal have excellent physical properties, but they emit carbon dioxide during disposal, causing global warming due to the increase of carbon dioxide in the atmosphere. Therefore, in view of preventing global warming, it is desirable to reduce the amount of petrochemical materials derived from such petroleum and the like, and there is a need for development of environmentally friendly materials that can replace them.

On the other hand, even if the plant-derived resin produced by photosynthetic reaction using carbon dioxide and water as the raw material is incinerated to generate carbon dioxide, the generated carbon dioxide corresponds to the carbon dioxide originally present in the atmosphere. It does not increase. When using carbon neutral material, the importance is emphasized from the viewpoint of preventing global warming by not increasing the total amount of carbon dioxide in the atmosphere.

Representative examples of such plant-derived resins include polylactic acid resins, which are obtained from corn or sugar cane and finally biodegradable (carbon neutral) into water and carbon dioxide, as well as excellent mechanical properties and melt molding. Therefore, it is used for various purposes in various fields. The polylactic acid resin has recently been attracting attention because it can be used in parts of automobiles or electronic products. In addition, it is advantageous from the viewpoint that stable supply is possible because the raw material is made from a permanent renewable plant, not a petroleum resource that is depleted due to limited reserves. In this regard, "biodegradable resins" are known as resins that can be degraded by the action of naturally occurring microorganisms such as bacteria and the like.

However, polylactic acid resin alone exhibits relatively hard and brittle properties as compared to other general-purpose polymer materials, and because of its low heat resistance, it is often difficult to be used for a member requiring high impact resistance and heat resistance, and the crystallization rate during molding processing. There is a disadvantage that the productivity is lowered because is slow.

In order to solve the problems caused by the application of the polylactic acid described above, a method of blending a polycarbonate resin or another heterogeneous polymer to a polylactic acid resin is known.

Japanese Patent No. 3279768 discloses a resin composition composed of an aromatic polycarbonate / polylactic acid alloy, having a pearl luster and excellent impact resistance and heat resistance. However, in the literature, it is described that it is preferable to use polylactic acid-based resin in the composition at about 10 to 50% by weight in terms of thermal and mechanical properties. In the case of more than%, there is a disadvantage that the compatibility is not good, the appearance is not good, heat resistance and impact resistance is significantly reduced. Moreover, since both polycarbonate and polylactic acid are hygroscopic resins, commercially available fields such as hydrolysis upon long-term use are limited, but the document does not recognize this.

In the technique disclosed in Japanese Patent Application Laid-open No. 2004-272620, there is a disadvantage in that the carbon dioxide reduction effect is not large by limiting the amount of polylactic acid-based resin to 50 wt% or less in order to satisfy both heat resistance and impact resistance of the resin composition. .

In the case of most prior arts, including the above-mentioned literatures, when two or more polymers are blended, they are separated into their respective phases, which causes swelling during extrusion, which makes it difficult to pellet the strands. It may also cause the occurrence of flow marks or surface peeling.

In order to solve the above problems, Korean Patent Publication No. 2007-104555 is based on 100 parts by weight of a polycarbonate resin composition consisting of 50 to 95% by weight of polycarbonate resin and 50 to 5% by weight of polylactic acid resin. A thermoplastic resin composition containing 5 to 65 parts by weight of a graft copolymer is disclosed.

WO 2006/38506 discloses carbon nanotubes 0.1 with respect to 100 parts by weight of a resin component consisting of 50 to 95% by weight of aromatic polycarbonate resins and 50 to 5% by weight of polylactic acid obtained from natural resins and / or synthetic lactic acid. An aromatic polycarbonate resin composition including 30 parts by weight is disclosed.

As such, there is a continuous development of technology to solve the degradation of physical properties such as impact resistance and heat resistance of the polycarbonate and polylactic acid resin blend or alloy and to have more improved characteristics.

On the other hand, PET (polyethylene terephthalate) is a container material such as various beverages, and has been rapidly spread due to its convenience, and a large amount of PET waste is generated every day. Legal and administrative standards for recycling such PET waste are being prepared, and methods such as manufacturing polyester fibers for garments using recycled PET or manufacturing them from polymer concrete and using them as building materials have been proposed. Has been. However, there is a continuous need for recycling PET waste to a broader and higher value-added sector.

The present invention overcomes the limitations of conventionally known polylactic acid resin and polycarbonate resin blends, and provides a resin composition excellent in impact resistance, heat resistance and durability.

In addition, the present invention is to provide a resin composition having a large effect on reducing the environmental load by recycling waste plastics, especially PET waste occupying a significant amount of household waste.

According to an embodiment of the invention,

Basic resin 100 comprising (A) 20 to 80 wt% of (a1) polylactic acid resin, (a2) 2 to 72 wt% of polycarbonate resin and (a3) 2 to 72 wt% of acrylonitrile-butadiene-styrene copolymer About parts by weight,

(B) 1 to 15 parts by weight of polyethylene terephthalate resin;

(C) 2 to 15 parts by weight of a methyl methacrylate-butadiene-styrene type copolymer having a core-shell structure as an impact modifier; And

(D) 0.2 to 3 parts by weight of a carbodiimide compound as a hydrolysis agent;

There is provided an eco-friendly resin composition comprising a.

According to another embodiment of the present invention, a molded article prepared from the resin composition is provided.

The resin composition according to the present invention can reduce environmental load by using polylactic acid as part of the base resin. In particular, in order to improve physical properties such as low heat resistance and impact resistance, which are a problem in the conventional polylactic acid resin and polycarbonate resin blend, there is an advantage of further improving environmental friendliness by using a PET resin available from recycled PET.

Therefore, it is expected that the present invention can be widely applied to materials for components such as automobile parts and housings of electric and electronic devices.

The present invention can all be achieved by the following description. It is to be understood that the preferred embodiments of the invention are described, but the invention is not necessarily limited thereto.

(A) basic resin

(a1) polylactic acid resin

In the present invention, the polylactic acid resin, which is one of the components constituting the base resin, is generally 2-hydroxy lactate (lactic acid) or a thermoplastic polyester of lactide (L- and D-lactic acid as a raw material, or a mixture thereof, Any of lactide, a dimer of lactic acid, is possible) and has a repeating unit of-[O-CH (CH ₃ ) -CO]-. The alpha carbon of the monomer has optical activity (L-form). In this connection, it is preferable to use a resin having high optical purity of the lactic acid component. Specifically, it is preferable that L-form (ie, poly-L-lactic acid) is included in the total lactic acid component of about 80% or more, and includes about 95% or more. More preferred. The higher the optical purity of 95% or more, the better the compatibility, the faster the crystallization rate and excellent mechanical properties can be obtained.

The molecular weight of the polylactic acid resin is not particularly limited as long as it can be molded, but is preferably about 50,000 to 400,000, more preferably 100,000 to 350,000 based on the weight average molecular weight (Mw). If the weight average molecular weight is less than 50,000, the mechanical properties may be lowered, while if the weight average molecular weight is more than 400,000, there may be a problem that the fluidity is lowered.

The melting point of the polylactic acid resin is also not particularly limited, but is preferably about 145 ° C or higher. In particular, since the melting point tends to be higher with higher optical purity, it is preferable to use a resin having high optical purity when a high temperature is required during processing.

The content of the resin composition thickening polylactic acid resin according to the present invention is preferably in the range of about 20 to 80% by weight, more preferably about 30 to 70% by weight, based on the weight of the base resin. If the polylactic acid resin content is less than 20% by weight, the effect of reducing the environmental load is small, whereas if it exceeds 80% by weight, the impact resistance and the heat resistance are lowered, so that the intended physical property level cannot be achieved.

(a2) polycarbonate resin

The polycarbonate resin, which is one of the components constituting the base resin in the resin composition according to the present invention, is typically a polymer having a repeating unit represented by the following general formula (1) as an aromatic polycarbonate resin:

[Formula 1]

Wherein A is a divalent aromatic radical derived from a divalent phenol used in the preparation of the polymer,

n is an integer from 10 to 100.

Hydroquinone, 2,2-bis (4-hydroxyphenyl) propane (bisphenol A), bis (4-hydroxyphenyl) methane, 1,1-bis (4-hydroxyphenyl) ethane as dihydric phenol Bis (4-hydroxyphenyl) alkanes such as 1,2-bis (4-hydroxyphenyl) ethane; Bis (4-hydroxyphenyl) cycloalkanes such as 1,1-bis (4-hydroxyphenyl) cyclohexane and 1,1-bis (4-hydroxyphenyl) cyclodecane; 4,4'-dihydroxydiphenyl, bis (4-hydroxyphenyl) oxide, bis (4-hydroxyphenyl) sulfide, bis (4-hydroxyphenyl) sulfone, bis (4-hydroxyphenyl) sulfoxide Side, bis (4-hydroxyphenyl) ketone, etc. can be illustrated. In particular, bisphenols are preferable and bisphenol A is more preferable.

The polycarbonate resin is prepared by reacting the dihydric phenolic compound with phosgene on an interface or in a daily routine. A polycarbonate resin having a specific molecular weight can be obtained by controlling the amount of monophenols such as phenol, paracresol and paraisooctyl phenol using a chain terminator.

According to the present invention, the polycarbonate resin preferably has a viscosity average molecular weight of about 10,000 to 35,000, more preferably about 15,000 to 30,000. At this time, if the average molecular weight of the polycarbonate resin is added less than 10,000, the tensile strength may be lowered, while if it exceeds 35,000, there may be a problem in the processing of the resin due to the increase in the melt viscosity. Therefore, it will be desirable to adjust to the above-mentioned range.

Moreover, a polycarbonate resin can also be manufactured using dihydric phenol individually or in combination of 2 or more types, In some cases, 2 or more types of polycarbonate resin can also be mixed and used.

The content of the polycarbonate is in the range of about 2 to 72% by weight, preferably 4 to 64% by weight, based on the weight of the base resin. When the content of the polycarbonate-based resin is less than 2% by weight, impact resistance or heat resistance may not be satisfactory, whereas when the content of the polycarbonate-based resin exceeds 72% by weight, fluidity may be lowered, thereby causing processing problems.

(a3) Acrylonitrile-butadiene-styrene copolymer (ABS) resin

 According to the present invention, the acrylonitrile-butadiene-styrene copolymer resin (hereinafter referred to as "ABS resin") which is one of the components of the base resin improves the compatibility between the polylactic acid resin and the polycarbonate resin, Impact resistance and cost reduction effect can be provided.

ABS resin according to the present invention can be applied to the polymer prepared by emulsion polymerization or bulk polymerization, it can be used alone or in combination. In a preferred aspect of the present invention, the butadiene rubber content in the ABS resin is preferably in the range of about 5 to 75% by weight, more preferably about 10 to 60% by weight. If the butadiene rubber content in the copolymer is too low, the impact strength may not be satisfactory, while if too high, the fluidity of the resin composition is lowered may cause difficulties in processing. Therefore, it is preferable to adjust to the above-mentioned range.

On the other hand, according to a preferable aspect of the present invention, it is preferable to appropriately adjust the ratio between the polycarbonate resin and the ABS resin in the base resin. That is, from about 10:90 to about 90:10, more preferably from about 20:80 to about 80:20 by weight. If it is less than the above range, the heat resistance and tensile strength may be sharply lowered to achieve the intended properties, while if it exceeds the above range, the extrusion process may be performed due to a decrease in compatibility between the polycarbonate resin and the polylactic acid resin. Sea swelling may occur and it may be difficult to pellet the strands.

The content of the ABS resin is in the range of about 2 to 72% by weight, preferably about 4 to 64% by weight, based on the weight of the base resin.

(B) polyethylene terephthalate (PET) resin

In the present invention, a fresh PET or recycled PET may be used as the polyethylene terephthalate resin. One of the advantages of the present invention is that it is possible to improve the physical properties of the resin composition by using PET waste, which has been required for recycling. That is, since the PET resin contained in the resin composition of the present invention is a recycled PET resin (hereinafter referred to as 'R-PET') having substantially the same composition, the recycled PET resin can be used without particular limitation. Therefore, in the present invention, the PET resin may use both recycled PET including newly synthesized PET, and it may be particularly advantageous to use recycled PET from the viewpoint of economic and environmental protection. Such R-PET may have a form in which waste flakes, which have been washed and pulverized, are pelletized through extrusion.

In the present invention, the PET component not only improves the thermal and mechanical properties of the resin composition, but also improves the recyclability of the waste PET as described above, thereby reducing the environmental load and reducing the cost.

In addition, in the composition according to the present invention, the PET resin improves heat resistance and mechanical strength by providing a reactive end group capable of reacting with the chain extender, thereby acting as a synergy in molecular weight increase. The PET resin preferably has a melting temperature of about 240 to 280 ° C., more preferably about 255 to 265 ° C., and an average intrinsic viscosity of about 0.3 to 1.3 dl / g, more preferably about 0.45 to 1.0. dl / g, and a moisture content is preferably about 0.1 to 0.4%, more preferably about 0.15 to 0.25%.

According to the present invention, the content of PET resin is in the range of 1 to 15 parts by weight, preferably 3 to 10 parts by weight, based on 100 parts by weight of the base resin. At this time, when the content of PET resin is less than 1 part by weight, tensile strength and impact strength are lowered, whereas when it exceeds 15 parts by weight, extrusion processing is difficult due to a decrease in compatibility with other resins. Since there may be an increasing disadvantage, it is necessary to adjust the range described above.

(C) Methyl methacrylate-butadiene-styrene (MBS) type copolymer

In the present invention, a methyl methacrylate-butadiene-styrene copolymer type having a core-shell structure (hereinafter, referred to as an MBS type copolymer), which is widely known in the art as an impact modifier of a resin composition. ) Resin is used.

In a preferred embodiment of the MBS type copolymer, the core is made of butadiene rubber, and the shell is preferably made of one or two or more of (meth) acrylic acid esters, styrenevinyl and vinyl cyanide. Examples of the meta (acrylic acid) ester in the components constituting the shell include methyl (meth) acrylate, ethyl (meth) acrylate, n-propyl (meth) acrylate, n-butyl (meth) acrylate and t-butyl (meth) acrylate. N-hexyl (meth) acrylate, cyclohexyl (meth) acrylate, chloromethyl (meth) acrylate, 2-chloroethyl (meth) acrylate, 2-hydroxyethyl (meth) acrylate, 3-hydroxy (meth) acrylate Propyl, etc., and examples of styrene vinyl include styrene, alpha-methylstyrene, vinyltoluene, o-ethylstyrene, and the like, and examples of vinyl cyanide include acrylonitrile, methacrylonitrile, and ethacrylonitrile.

In the present invention, the MBS type impact modifier not only improves the dispersibility of the ABS resin in the base resin (polylactic acid resin / polycarbonate resin / ABS resin), but also serves as an impact modifier to improve impact resistance. The content of the MBS type copolymer is in the range of about 2 to 15 parts by weight, preferably 3 to 10 parts by weight, based on 100 parts by weight of the base resin. At this time, if less than 2 parts by weight, the impact strength is insufficient to obtain the desired physical properties, while if it exceeds 15 parts by weight it is necessary to control the above range because the fluidity is lowered may cause difficulties in processing.

(D) Carbodiimide Compound

According to the present invention, a carbodiimide-based compound can be used as the hydrolysis agent, and typically carbodiimide of the monomer type represented by the following formula (4) and carbodiimide of the polymer type represented by the following formula (5) It is possible to use, preferably a mixture of the monomer type and polymer type.

[Formula 4]

In the above formula, R ₁ and R ₂ are each a hydrogen atom, an alkyl group having 1 to 20 carbon atoms or an aryl group having 6 to 36 carbon atoms.

Specific examples of the compound according to Chemical Formula 4 may include bis- (2,6-diisopropyl-phenyl) -carbodiimide.

[Chemical Formula 5]

Wherein R is an alkyl group having 1 to 20 carbon atoms or an aryl group having 6 to 36 carbon atoms,

n represents an average degree of polymerization as an integer of 2 to 30,000.

Specific examples of the compound according to Chemical Formula 5 include poly [(2,4,6-triisopropyl-phenyl) -carbodiimide].

Monomer type carbodiimide is highly reactive and reacts rapidly with the carboxyl group at the end of polyester to reduce the number of end groups, while the polymer type carbodiimide exhibits long-term hydrolysis characteristics, thereby maintaining the physical properties of the composition. It plays a role.

According to a preferred aspect of the present invention, when used in the form of a mixture of the monomer type and the polymer type carbodiimide-based compound, the composition ratio of the monomer type and the polymer type is based on weight, preferably about 90:10 to about 10: 90, more preferably about 50:50.

In addition, it is preferable to use monocarbodiimide and / or poly carbodiimide prepared in the form of granules to facilitate processing. In the present invention, the carbodiimide-based compound is contained in about 0.2 to 3 parts by weight, preferably about 0.5 to 2.5 parts by weight based on 100 parts by weight of the base resin. If it is less than 0.2 parts by weight, the hydrolysis characteristics are not expressed, while if it exceeds 3 parts by weight, mechanical properties may be lowered, and therefore, it is necessary to adjust the above range.

According to the present invention, the following components (E), (F) and (G) can be selectively added in order to impart additional advantages to the resin composition, the description thereof is as follows.

(E) Ethylene Copolymer

According to the present invention, an ethylene copolymer is used as a compatibilizer to improve dispersibility through increasing compatibility between polylactic acid resin or PET and MBS type impact modifier. As a representative example of such a compatibilizer, an ethylene-alkylacrylate-glycidyl methacrylate copolymer represented by the following formula (2) is preferably used.

[Formula 2]

Wherein R ₁ is an alkyl group having 1 to 6 carbon atoms, R ₂ is glycidyl, and x, y and z each represent an average degree of polymerization in the range of 2 to 30,000.

In a preferred aspect of the present invention, in the case of the ethylene copolymer having the above formula, more preferably about 60 to 80 wt% of ethylene content, about 15 to 30 wt% of alkyl acrylate content, and glycidyl methacrylate content Use is in the range of 5 to 12% by weight.

According to the invention, the content of the ethylene copolymer is preferably in the range of about 0.5 to 5 parts by weight, more preferably about 1.0 to 3 parts by weight, based on 100 parts by weight of the base resin. If the content of the ethylene copolymer is too small, the dispersion of rubber particles may not be affected due to the lack of commercialization effects, and thus the impact strength of the ethylene copolymer may not be improved. While the effect of reducing the can be lowered, the fluidity is lowered in too much content range, rather it causes the difficulty and physical properties of the processing is preferable to adjust to the above-mentioned range.

(F) Epoxy Group-containing Acrylic Ester Resins

According to the present invention, an acrylic ester resin may be used as the chain extender, and an acrylic ester resin containing an epoxy group represented by the following general formula (3) may be used. More specifically, it is styrene-acrylic ester resin containing an epoxy group or acrylic ester resin containing no styrene.

(3)

Wherein m and n each represent an average degree of polymerization as an integer of 2 to 30,000.

The chain extender component may react with the polylactic acid resin and the carboxyl group at the end of PET (R-PET) and the epoxy group of the chain extender to form a branched chain through chain extension, thereby improving melt strength and It contributes to the improvement of mechanical properties, thereby improving mechanical, thermal and general properties.

According to the present invention, the acrylic ester resin containing the epoxy group is preferably contained in an amount of about 0.2 to 3 parts by weight, more preferably about 0.5 to 2 parts by weight, based on 100 parts by weight of the base resin. When the content of the chain extender is too small, it does not affect the expected improvement of physical properties according to the addition, while in the case of too high, it is preferable to control the above-mentioned range because the fluidity is difficult to injection injection due to the increase in molecular weight.

(G) other additives

According to the present invention, in addition to the above-described components, various additives commonly used in the art such as heat stabilizers, antioxidants, lubricants, light stabilizers, black master batches, nucleating agents and the like within the scope of not impairing the characteristics of the present invention alone. Or in combination up to about 5 parts by weight, preferably within the range of about 0.2 to 5 parts by weight, based on the total weight of the resin composition described above, depending on the purpose of use and use.

According to a preferred embodiment of the present invention, the components constituting the composition can be obtained through a melt kneading process known in the art, for which ribbon blender, Henschel mixer, Banbury mixer, drum tumbler, single screw extruder, 2 A screw screw extruder, a corneader, a multi screw screw extruder, etc. can be used.

The resin composition described above can not only exhibit the excellent mechanical properties of polycarbonate and the environmentally friendly and excellent flow characteristics of the polylactic acid resin, but also can obtain a molded article with improved hydrolysis resistance and impact resistance. In particular, it is preferable in terms of environmental friendliness, since the possibility of using waste PET, which has been continuously studied in the past, can be further expanded. Therefore, it may be widely used in various fields such as various OA devices, information and communication devices, automobile interior and exterior materials, building members, and home telephone equipment.

The present invention can be more clearly understood by the following examples, which are only intended to illustrate the present invention and are not intended to limit the scope of the invention.

Examples 1-12

A polylactic acid resin having a weight average molecular weight of 200,000, a linear polycarbonate resin having a viscosity average molecular weight of 21,000, and an emulsion-polymerized ABS resin having a rubber content of 60% and a block-polymerized ABS resin having a rubber content of 15% are used as the base resin, and the melting temperature is 255 to 265. It was prepared by combining the recycled polyethylene terephthalate resin (R-PET) and the remaining components having an average specific viscosity of 0.65 dl / g, and a moisture content of about 0.2%.

The components constituting the resin composition shown in Table 2 were uniformly mixed and dispersed in a Henschel mixer, and then the extrusion temperature was about 200 to 245 using a coaxial twin screw extruder of L / D = 40 and Φ = 25 (mm). The resin composition was prepared by extrusion under conditions of 200 ° C. and screw rotation speed.

Comparative Examples 1 to 8

A resin composition was prepared in the same manner as in Example 1, except that the composition ratio was changed as described in Table 2 below.

[Experimental Example]

Physical property measurement experiment

After fixing the pelletized resin compositions prepared in Examples 1 to 12 and Comparative Examples 1 to 8 at a cylinder temperature of about 220 to 260 ° C. and a mold temperature of 40 ° C., the specimens were injection molded, and the properties of each of the molded specimens were It was measured by the method. The experimental results are shown in Table 2 below, and Table 1 below is a reference value of the physical properties of the automotive interior material.

Physical properties were evaluated by the following measuring method.

-Flow index: ASTM D1238 (250 ℃, 5.0kg)

-Tensile Strength and Elongation: ASTM D638 (cross head speed: 50 mm / min)

-Flexural strength and modulus: ASTM D790 (cross head speed: 10 mm / min)

-Impact Strength: ASTM D256 (1/8 inch, Notched Izod, Room Temperature)

-Heat Deflection Temperature: ASTM D648 (4.6 kg _f / cm ² )

-Hydrolysis test: After measuring for 60 days in a thermo-hygrostat and maintaining 90% RH of humidity, measured and evaluated the physical properties before and after the test.

TABLE 1

division Before constant temperature and humidity test Heat deformation
Temperature (℃) Impact strength
(kg _f · cm / cm) The tensile strength
(kg _f / cm ² ) Tensile elongation
(%) Flexural strength
(kg _f / cm ² ) Flexural modulus
(kg _f / cm ² ) Flow index
(g / 10 min) ≥60 ≥10 ≥600 ≥12 ≥800 ≥22,000 ≥15 After constant temperature and humidity test Heat deflection temperature
(℃) Impact Strength *
(%) The tensile strength*
(%) Tensile Elongation *
(%) ≥60 60 90 60

* Property retention rate (%) = (property after hydrolysis test) / (property before hydrolysis test) X100 (%)

TABLE 2

As shown in Table 2, the physical properties before and after the constant temperature and humidity test of the resin composition specimens prepared according to Examples 1 to 11 were relatively superior to the physical properties of the specimens prepared according to Comparative Examples 1 to 11, All reference values were satisfied. Therefore, it was found that the resin composition of the present invention reduces the environmental load and can be applied to materials for components such as automobile parts and housings of electric and electronic devices.

All simple modifications and variations of the present invention fall within the scope of the present invention, and the specific scope of the present invention will be apparent from the appended claims.

Claims (12)

A base resin comprising (A) 20 to 80 wt% of (a1) polylactic acid resin, (2) to 72 wt% of (a2) polycarbonate resin and (a3) 2 to 72 wt% of acrylonitrile-butadiene-styrene copolymer resin Per 100 parts by weight, (B) 1 to 15 parts by weight of polyethylene terephthalate resin; (C) 2 to 15 parts by weight of a methyl-methacrylate-butadiene-styrene type copolymer having a core-shell structure as an impact modifier; And (D) 0.2 to 3 parts by weight of a carbodiimide compound as a hydrolysis agent; Eco-friendly resin composition comprising a. The method of claim 1, wherein the resin composition further comprises (E) an ethylene copolymer as a compatibilizer, (F) an epoxy group-containing acrylic ester resin as a chain extender, or a combination thereof, The content of the ethylene copolymer is in the range of 0.5 to 5 parts by weight based on 100 parts by weight of the base resin, and the content of the epoxy group-containing acrylic ester resin is in the range of 0.2 to 3 parts by weight based on 100 parts by weight of the base resin. Eco-friendly resin composition. The eco-friendly resin composition of claim 2, wherein the ethylene copolymer is an ethylene-alkylacrylate-glycidyl methacrylate copolymer represented by the following Chemical Formula 2: [Formula 2]

Wherein R ₁ is an alkyl group having 1 to 6 carbon atoms, R ₂ is glycidyl, and x, y and z each represent an average degree of polymerization in the range of 2 to 30,000. The eco-friendly resin composition of claim 2, wherein the epoxy group-containing acrylic ester resin is represented by the following Chemical Formula 3: (3)

Wherein m and n each represent an average degree of polymerization as an integer of 2 to 30,000. The eco-friendly resin composition of claim 1, wherein the weight average molecular weight of the polylactic acid resin is 50,000 to 400,000. The eco-friendly resin composition of claim 1, wherein the polycarbonate resin has a viscosity average molecular weight of 10,000 to 35,000. The eco-friendly resin composition according to claim 1, wherein the polyethylene terephthalate resin is a recycled polyethylene terephthalate resin. The eco-friendly resin composition of claim 1, wherein the polyethylene terephthalate resin has a melting temperature of 240 to 280 ° C., an average intrinsic viscosity of 0.3 to 1.3 dl / g, and a moisture content of 0.1 to 0.4%. The eco-friendly resin according to claim 1, wherein the methyl methacrylate-butadiene-styrene type copolymer has a core made of butadiene and the shell is made of (meth) acrylic acid ester, styrenevinyl, vinyl cyanide or a combination thereof. Composition. The method of claim 1, wherein the carbodiimide-based compound is a carbodiimide of the monomer type represented by the following formula (4), a polymer type carbodiimide represented by the following formula (5), or a combination thereof Resin composition: [Formula 4]

In the above formula, R ₁ and R ₂ are each a hydrogen atom, an alkyl group having 1 to 20 carbon atoms or an aryl group having 6 to 36 carbon atoms. [Chemical Formula 5]

Wherein R is an alkyl group having 1 to 20 carbon atoms or an aryl group having 6 to 36 carbon atoms, n represents an average degree of polymerization as an integer of 2 to 30,000. The method according to claim 1 or 2, at least one additive selected from the group consisting of a thermal stabilizer, an antioxidant, a lubricant, a light stabilizer, a black master batch and a nucleating agent based on the weight of the entire resin composition is 0.2 to 5 Eco-friendly resin composition characterized in that it further comprises within the weight part range. Molded product prepared from the resin composition according to any one of claims 1 to 10.