KR20130128203A - Biodegradable resin composition including polylactic acid and method for manufacturing thereof - Google Patents

Abstract

The present invention relates to a biodegradable resin composition including polylactic acid and a manufacturing method thereof and, more specifically, to a film which has excellent flexibility is prevented from being torn by adding a plasticizer and a molecular weight controller to the composition. A biodegradable film of the present invention manufactured by using the biodegradable composition has excellent tearing strength (kgf/cm), elongation (%), and heat fusion strength (kgf/cm) compared to those of a resin film manufactured by using a conventional biodegradable resin, thereby improving use efficiency which has been insufficient due to low physical properties and improving environment by being completely decomposed in a natural state. [Reference numerals] (AA) Elongation, Longitudinal direction (%);(BB,KK) Example 1;(CC,LL) Example 2;(DD,MM) Example 3;(EE,NN) Example 4;(FF,OO) Example 5;(GG,PP) Example 6;(HH,QQ) Comparative example 1;(II,RR) Comparative example 2;(JJ) Elongation, Width direction (%)

Description

TECHNICAL FIELD The present invention relates to a biodegradable resin composition comprising polylactic acid and a biodegradable resin composition including polylactic acid and a method for manufacturing the same.

The present invention relates to a biodegradable resin composition comprising polylactic acid (hereinafter referred to as PLA) and a method for producing the same. And more particularly to a film produced by adding a plasticizer and a molecular weight modifier to the composition, which is excellent in flexibility and does not easily tear.

Plastics are widely used as packaging materials that are indispensable to the life of modern people due to their excellent physical properties and low cost and light characteristics. However, environmental pollution caused by the plethora of plastic products world-wide is getting serious. Polyethylene, polypropylene, and polyethylene terephthalate (hereinafter, PET) are widely used as plastic for general packaging, but these materials have a risk of damaging the incinerator due to a high calorific value at the time of burning. Chemical and biological stability, it causes problems such as remaining in the environment, polluting the environment, shortening the life time of the landfill, and disposal cost. In order to solve this problem, biodegradable plastics have been developed which have low calorific value of combustion, are decomposed in soil, and decompose at the time of landfilling, thereby realizing early stabilization of landfill.

Biodegradation technology, photolysis technology, and biodegradation technology that combines these two technologies are divided into technologies related to degradable plastics. Biodegradable plastics include microbial production polymers such as PHB (poly-β-hydroxybutylate), microbial biomaterials, natural polymers such as aliphatic polyesters synthesized chemically, chitin, Starch, etc., and biodegradable materials that have been put into practical use now include polylactic acid, starch mixtures, and aliphatic polyesters. In order to achieve similar physical properties and price competitiveness to conventional plastics, various methods It is being tried.

Particularly, PLA is a biodegradable resin made from starch produced from carbonic acid gas and water by photosynthesis. Since it is hydrolyzed in soil or water with a small amount of heat generated by combustion, it becomes a harmless degradation product by microorganisms, It is called biodegradable resin. It is also a biodegradable resin approved by the US Food and Drug Administration (FDA) for use in food. However, despite its many advantages, PLA has a low flexibility and low melting point due to "brittle", which limits application to hollow molded products and foamed products. In order to overcome such drawbacks, researches have been actively carried out to increase the melt strength. Recently, a lot of studies have been conducted to expand application fields such as extrusion foaming and hollow molded products. In order to improve the brittleness of high- Studies have been actively made on the preparation of copolymers using other monomers, blending using low molecular weight plasticizers, or physical modification through addition of nucleophiles or annealing. However, the physical properties of the PLA films have been improved so that elongation (%) and tear strength It is very urgent to propose alternatives to overcome this problem by increasing the back of the film and increasing the blowing of the film.

Korea Patent Publication No. 2010-0036872

An object of the present invention is to provide a biodegradable resin composition excellent in mechanical properties and processability and a method of producing the same, in order to solve the above problems.

It is still another object of the present invention to provide a film using the biodegradable resin composition.

The present invention relates to a biodegradable resin composition comprising a polyester resin containing polylactic acid, a molecular weight modifier containing at least one selected from peroxide and diisocyanate, and a plasticizer, and a method for producing the same. More particularly, the present invention relates to a biodegradable resin composition comprising 10 to 40 parts by weight of a plasticizer and 0.3 to 1.5 parts by weight of a molecular weight regulator, based on 100 parts by weight of a polyester resin containing polylactic acid (PLA).

The polyester resin used in the present invention may contain, in addition to polylactic acid (PLA), polybutylene succinate (PBS), polybutylene adipate-co-terephthalate (PBAT) Polybutylene succinate-co-adipate (PBSA), polyhydroxy alkanoate (PHA), polyhydroxybutyrate (PHB), polypropylene carbonate carbonate, PPC), but the present invention is not limited thereto.

The present invention preferably comprises 70 to 100 parts by weight of polylactic acid (PLA) relative to 100 parts by weight of the polyester-based resin. The polylactic acid (PLA) may be a mixture of a crystalline polylactic acid composed of L-polylactic acid or D-polylactic acid and an amorphous polylactic acid composed of a mixture of L-polylactic acid and D- 0.3 to 3.0 (amorphous polylactic acid) weight ratio.

The main feature of the present invention is that the film produced using the biodegradable resin composition does not easily break or tear, and plasticizers and molecular weight regulators for promoting plasticization to facilitate plastic working . By using the plasticizer and the molecular weight modifier used in the present invention, excellent results of elongation, tear strength and thermal fusion strength were obtained and the above-mentioned characteristics were confirmed (see Table 1).

The plasticizer used in the present invention includes at least one selected from a citrate based plasticizer, triacetin, polyethylene glycol (PEG), lactide monomer, and soybean oil (Epoxy soybean oil) . More preferably, the citrate based plasticizer is selected from the group consisting of tributyl citrate, triethyl citrate (TEC), triethylhexyl citrate, acetyl tributyl citrate, But is not limited thereto.

The molecular weight modifier is preferably at least one selected from the group consisting of peroxide, diisocyanate, cross-linking agent, modified acrylic resin and modified imide resin.

The peroxide is selected from the group consisting of dibenzoyl peroxide, 2,5-dimethyl-2,5 di (t-butylperoxy) -Hexane, Di-t-butylperoxide, Di- (2-t-butylperoxyisopropyl) benzene, Oxide (Dicumyl peroxide), but it is not limited thereto.

The diisocyanate is preferably, but not limited to, toluene diisocyanate (TDI), diphenylmethane diisocyanate (MDI), hexamethylene diisocyanate (HDI), or isophorone diisocyanate (IPDI).

The crosslinking agent may be selected from the group consisting of trially isocyanulate (TAIC), box (2,2'-bis (2-oxazoline)), Butyl acrylate rubber-styrene copolymer (TMPTA), butyl acrylate-methylmethacrylate grafted co-polymer, butyl acrylate rubber-styrene copolymer ), A styrene acrylate copolymer, a modified uretonimine, a polycarbodiimide, a bis- (2,6-diisopropylphenyl) carbomide (Bis - (2,6-diisopropylphenyl) carbodimide) or a monomeric carbodiimide, but is not limited thereto.

  The biodegradable resin composition of the present invention may further comprise 1 to 30 parts by weight of an inorganic filler and 0.3 to 1.5 parts by weight of a processing additive, based on 100 parts by weight of a polyester resin containing polylactic acid. The inorganic filler is preferably at least one selected from calcium carbonate, wollastonite, and talc, Clay, and bentonite.

In addition, the processing additives include amide waxes such as antioxidants, oleamide, stearamide, erucylamide, and ethylene bis stearamide EBS wax, which is a film composition enhancer, and processability improvers Stearate wax, and may further comprise a UV stabilizer, a pigment, or a mixture thereof as a processing additive.

The antioxidant (3,5-di - t - butyl-4-hydro-dihydro when cinnamate) methane ((3,5-di- t -butyl- 4-hydroxyhydrocinnamate) methane) , or tris (2,4-di - t - should preferably butylphenyl phosphite ((Tris (2,4-di- t -butylphenyl) phosphite) , but not limited thereto.

The content of the processing additive is 0.1 to 0.5 parts by weight of an antioxidant, 0.1 to 0.5 parts by weight of an amide wax, and 0.5 to 5 parts by weight of a stearate wax, based on 100 parts by weight of a polyester resin containing polylactic acid (PLA) And 1.0 part by weight of the water-soluble polymer.

In the method of producing a film using the above composition, the above composition except for the plasticizer was uniformly mixed with a super mixer capable of rotating at a high speed of 400 rpm or more, and the plasticizer was fed side by side using a liquid level dosing device.

In addition, a co-rotating twin-screw extruder capable of screw combination was used for uniform mixing, and the screw combination of the extruder was made so that the length of the kneading zone was 40 to 70% of the total screw length so as to include one or more reverse screw components. Respectively. When the content is less than 40%, the kneading property is insufficient. Above all, the residence time for the reaction is extremely shortened. When the content is over 70%, the resin is deteriorated and excessive reaction occurs due to excessive shear force, thereby deteriorating the physical properties of the final compound.

The compound condition is preferably a temperature of 120 to 250 DEG C and a screw speed of 200 to 500 rpm. When the temperature is 120 ° C or less and the screw is 200rpm or less, the melting state of the resin is not uniform. When the temperature is 250 ° C or more and the screw is 500rpm or more, volatilization of the plasticizer and deterioration of the resin occur. The motor load is characterized by more than 50%. When the motor load is 50% or less, the additives do not uniformly mix due to insufficient filling rate.

Screen pack The actual opening size is 180 ~ 40μm. Below 170 microns, the fineness of the added filler can not be properly filtered to reduce the surface quality of the film. If the packing density is over 40 microns, the productivity of the film is drastically reduced due to excessive pack pressure.

In another aspect, the present invention relates to a biodegradable resin composition which has good brittleness and has good flexibility (i.e., excellent toughness) with excellent internal tearing strength, elongation and thermosetting strength Or hardness and can be easily manufactured at low cost. This film can overcome the limit of tearing of existing film, has excellent heat sealing strength, and has a low melting strength, And thus it is possible to overcome the problem that the blowing of the film is not easy.

The elongation, tensile strength and tearing strength of the film according to the present invention were measured by KPS M 1015, and elongation was 200% or more, tensile strength was 250 kgf / cm ² or more, tear strength (1 mm notch) was 60 kgf / cm < / RTI > The heat sealing strength measured according to KPS M1013 is 0.5 kgf / cm or more.

The biodegradable film produced using the biodegradable resin composition according to the present invention has a tear strength (kgf / cm), an elongation percentage (%) and a tensile strength (%) as compared with a resin film made of a conventional biodegradable resin by adding a plasticizer and a molecular weight- , And thermal fusion strength (kgf / cm), which can overcome the problem of use due to low physical properties and can contribute to the improvement of the environment by completely biodegrading in a natural state.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a view showing elongation ratios of Examples and Comparative Examples of the present invention. Fig.
2 is a view showing tearing strengths of Examples and Comparative Examples of the present invention.
Fig. 3 is a graph showing the thermal fusion strengths of Examples and Comparative Examples of the present invention.

Hereinafter, the present invention will be described in more detail with reference to examples and comparative examples. These examples are only for illustrating the present invention in more detail, and it is obvious to those skilled in the art that the scope of the present invention is not limited by these examples according to the gist of the present invention. will be.

Example 1.

Amorphous polylactic acid (PLA) having a glass transition temperature of 55 to 60 占 폚, 11 to 13 parts by weight of D-lactic acid and 89 to 87 parts by weight of L-lactic acid based on 100 parts by weight of amorphous polylactic acid (PLA) ) 65 parts by weight; And a crystalline polylactic acid (PLA) having a glass transition temperature of 60 to 65 占 폚, 1 to 2 parts by weight of D-lactic acid and 99 to 98 parts by weight of L-lactic acid based on 100 parts by weight of crystalline polylactic acid , 10 parts by weight of triacetin and 12 parts by weight of tributyl citrate as a plasticizer were added to 100 parts by weight of a polyester-based resin containing 35 parts by weight of terephthalic acid. 10 parts by weight of inorganic filler calcium carbonate (average particle diameter 1 micron, Omiya Korea, Korea); , 0.6 part by weight of diphenylmethane diisocyanate (MDI), 0.1 part by weight of peroxide (di- (2-t-butylperoxyisopropyl) benzene) 0.4 parts by weight of trially isocyanulate (TAIC), and (3, 5-di- t -butyl-4-hydrocyanhydinnamate) methane ((3 t - -, 5-di- t -butyl-4-hydroxyhydrocinnamate) methane), Chem chyura, USA), 0.2 parts by weight, and the second tris (2,4-di-a tea antioxidant-butylphenyl) phosphite ((tris ( and mixed by adding; Nobel, Netherlands) 0.2 parts by weight - 2,4-di- t -butylphenyl) phosphite ), Chem chyura, USA), 0.2 parts by weight of amide wax (Erucyl amide, Akzo. The mixture was extruded at a temperature of 185 캜 (extruded at a temperature of 140 to 230 캜 at any temperature using a co-rotating twin screw extruder (TEK30MHS, SM PLATEK) capable of combining screw elements, Extruded under the conditions of a vacuum pressure of 8 Torr (all can be performed at less than 10 Torr), a screen mesh of 80/150/200/80, a screw of 250 rpm, and a motor load of 70%. Then, the temperature was 160 DEG C (the temperature was 120 DEG C to 180 DEG C, which was carried out at 160 DEG C in this embodiment) using a blow film molding machine having a diameter of 58 mm. Blow up ratio ) 2.5. ≪ / RTI > Tensile strength (kgf / cm), elongation percentage (%), and heat fusion strength (kgf / cm) of the film prepared in Example 1 were measured and the results are shown in Figs. 1 to 3 and Table 1 .

Example 2.

Amorphous polylactic acid (PLA) having a glass transition temperature of 55 to 60 占 폚, 11 to 13 parts by weight of D-lactic acid and 89 to 87 parts by weight of L-lactic acid based on 100 parts by weight of amorphous polylactic acid (PLA) ) 30 parts by weight; A crystalline polylactic acid 60 having a glass transition temperature of 60 to 65 占 폚, a content of D-lactic acid of 1 to 2 parts by weight and a content of L-lactic acid of 99 to 98 parts by weight based on 100 parts by weight of crystalline polylactic acid (PLA) Weight part; And 5 parts by weight of polybutylene adipate-co-terephthalate (PBAT, MI 1.5 (190 캜 x 2.16 KG load)) and 5 parts by weight of polybutylene succinate (PBS) 5 , 5 parts by weight of triacetin and 15 parts by weight of tributyl citrate as plasticizers, 9.1 parts by weight of calcium carbonate as an inorganic filler; As the molecular weight regulator, 0.4 part by weight of (diphenylmethane diisocyanate (MDI), reagent), 2 parts by weight of peroxide (di- (2-t-butylperoxyisopropyl) benzene) Reagent) and 0.4 parts by weight of a crosslinking agent (TAIC); And a processing additive, a primary antioxidant ((3,5-di - t - butyl-4-hydro-dihydro when cinnamate) methane ((3,5-di- t -butyl- 4-hydroxyhydrocinnamate) methane), Chem chyura) 0.2 part by weight, the secondary antioxidant (tris (2,4-di - t - butylphenyl phosphite ((tris (2,4-di- t -butylphenyl) phosphite), chyura-Chem) 0.2 parts by weight And 0.2 part by weight of an amide wax (Erucyl amide, Akzo-nobel) were added, mixed and extruded to prepare pellets. The extrusion and molding conditions were the same as in Example 1, Respectively.

Tensile strength (kgf / cm), elongation percentage (%), and thermal fusion strength (kgf / cm) of the film produced through Example 2 were measured and the results are shown in Figs. 1 to 3 and Table 1 .

Example 3.

Amorphous polylactic acid (PLA) having a glass transition temperature of 55 to 60 占 폚, 11 to 13 parts by weight of D-lactic acid and 89 to 87 parts by weight of L-lactic acid based on 100 parts by weight of amorphous polylactic acid (PLA) ) 45 parts by weight; Crystalline polylactic acid 37 having a glass transition temperature of 60 to 65 占 폚, 1 to 2 parts by weight of D-lactic acid and 99 to 98 parts by weight of L-lactic acid based on 100 parts by weight of crystalline polylactic acid (PLA) Weight part; 10 parts by weight of polybutylene adipate-co-terephthalate (PBAT); And 8 parts by weight of polybutylene succinate (PBS, MI 1.5 (190 占 폚 占 2.16 KG load)), 5 parts by weight of triacetin as a plasticizer, 15 parts by weight of tributyl citrate; 24 parts by weight of calcium carbonate as an inorganic filler;

0.5 parts by weight of diisocyanate (MDI) and 0.1 parts by weight of di- (2-t-butylperoxyisopropyl) benzene as a molecular weight modifier; And 0.15 part by weight of a second antioxidant (same as in Example 1) and 0.15 part by weight of an amide wax (same as in Example 1), 0.15 part by weight Were added, mixed, and extruded to prepare pellets. Extrusion and molding conditions were carried out under the same conditions as in Example 1 to prepare a film having a thickness of 30 탆.

The tear strength (kgf / cm), the elongation percentage (%), and the heat fusion strength (kgf / cm) of the film prepared in Example 3 were measured and the results are shown in Figs. 1 to 3 and Table 1 .

Example 4.

Amorphous polylactic acid (PLA) having a glass transition temperature of 55 to 60 占 폚, 11 to 13 parts by weight of D-lactic acid and 89 to 87 parts by weight of L-lactic acid based on 100 parts by weight of amorphous polylactic acid (PLA) ) 50 parts by weight; And a crystalline polylactic acid (PLA) having a glass transition temperature of 60 to 65 占 폚, 1 to 2 parts by weight of D-lactic acid and 99 to 98 parts by weight of L-lactic acid based on 100 parts by weight of crystalline polylactic acid 27 parts by weight; 5 parts by weight of polybutylene adipate-co-terephthalate (PBAT); 5 parts by weight of triacetin and 10 parts by weight of tributyl citrate as a plasticizer were added to 100 parts by weight of a polyester resin containing 10 parts by weight of polybutylene succinate (PBS) ; 20 parts by weight of calcium carbonate as an inorganic filler; As a molecular weight modifier, 0.1 part by weight of peroxide and 0.2 part by weight of a crosslinking agent (TAIC, reagent); And 0.2 part by weight of a second oxidation inhibitor (same as in Example 1) and 0.15 part by weight of an amide wax (same as in Example 1) Were added, mixed, and extruded to prepare pellets. Extrusion and molding conditions were carried out under the same conditions as in Example 1 to prepare a film having a thickness of 30 탆. Tensile strength (kgf / cm), elongation percentage (%) and thermal fusion strength (kgf / cm) of the film produced through Example 4 were measured and the results are shown in Figs. 1 to 3 and Table 1 .

Example 5.

Amorphous polylactic acid (PLA) having a glass transition temperature of 55 to 60 占 폚, 11 to 13 parts by weight of D-lactic acid and 89 to 87 parts by weight of L-lactic acid based on 100 parts by weight of amorphous polylactic acid (PLA) ) 45 parts by weight; Crystalline polylactic acid 25 having a glass transition temperature of 60 to 65 占 폚, 1 to 2 parts by weight of D-lactic acid and 99 to 98 parts by weight of L-lactic acid based on 100 parts by weight of crystalline polylactic acid (PLA) Weight part; 25 parts by weight of polybutylene adipate-co-terephthalate (PBAT); 10 parts by weight of triacetin and 20 parts by weight of tributyl citrate as a plasticizer were added to 100 parts by weight of a polyester resin containing 5 parts by weight of polybutylene succinate (PBS) ; 22 parts by weight of calcium carbonate as an inorganic filler; As the molecular weight regulator, 0.4 part by weight of diisocyantate and 0.1 part by weight of peroxide; And 0.12 parts by weight of a second antioxidant (same as in Example 1) and 0.15 part by weight of an amide wax (same as in Example 1), 0.15 parts by weight of a second antioxidant Were added, mixed and extruded. Extrusion and molding conditions were carried out under the same conditions as in Example 1 to prepare a film having a thickness of 30 탆. The results are shown in Figs. 1 to 3 and Table 1 by measuring the tear strength (kgf / cm), elongation percentage (%), and heat fusion strength (kgf / cm) .

Example 6.

Amorphous polylactic acid (PLA) having a glass transition temperature of 55 to 60 占 폚, 11 to 13 parts by weight of D-lactic acid and 89 to 87 parts by weight of L-lactic acid based on 100 parts by weight of amorphous polylactic acid (PLA) ) 37 parts by weight; And a crystalline polylactic acid (PLA) having a glass transition temperature of 60 to 65 占 폚, 1 to 2 parts by weight of D-lactic acid and 99 to 98 parts by weight of L-lactic acid based on 100 parts by weight of crystalline polylactic acid 43 parts by weight; 10 parts by weight of polybutylene adipate-co-terephthalate (PBAT); 8 parts by weight of triacetin and 11 parts by weight of tributyl citrate were added as a plasticizer to 100 parts by weight of a polyester resin containing 10 parts by weight of polybutylene succinate (PBS) 8 parts by weight of calcium carbonate as an inorganic filler; 0.3 parts by weight of diisocyantate, 0.2 parts by weight of peroxide and 0.5 parts by weight of a crosslinking agent as molecular weight modifiers; And 0.15 part by weight of a second oxidation inhibitor (same as in Example 1) and 0.15 part by weight of an amide wax (same as in Example 1) 0.16 part by weight (same as in Example 1) Were added, mixed and extruded.

Extrusion and molding conditions were carried out under the same conditions as in Example 1 to prepare a film having a thickness of 30 탆. The tear strength (kgf / cm), the elongation percentage (%), and the heat fusion strength (kgf / cm) of the film prepared in Example 6 were measured and the results are shown in Figs. 1 to 3 and Table 1 .

Comparative Example  One.

Amorphous polylactic acid (PLA) having a glass transition temperature of 55 to 60 占 폚, 11 to 13 parts by weight of D-lactic acid and 89 to 87 parts by weight of L-lactic acid based on 100 parts by weight of amorphous polylactic acid (PLA) ) 52 parts by weight; And a crystalline polylactic acid (PLA) having a glass transition temperature of 60 to 65 占 폚, 1 to 2 parts by weight of D-lactic acid and 99 to 98 parts by weight of L-lactic acid based on 100 parts by weight of crystalline polylactic acid 40 parts by weight; 8 parts by weight of tributyl citrate, which is a plasticizer, was added to 100 parts by weight of a polyester resin containing 8 parts by weight of polybutylene succinate (PBS). 12 parts by weight of calcium carbonate as an inorganic filler; 0.07 part by weight peroxide as a molecular weight regulator; And 0.15 parts by weight of a first antioxidant as a processing additive, 0.15 part by weight of a second antioxidant, and 0.10 part by weight of an amide wax were mixed and extrusion molded into a film having a thickness of 30 μm. (The constituent materials and methods except for the content of this comparative example are the same as those used in Example 1).

Tensile strength (kgf / cm), elongation percentage (%) and thermal fusion strength (kgf / cm) of the film prepared in Comparative Example 1 were measured and the results are shown in Figs. 1 to 3 and Table 1 .

Comparative Example 2

Crystalline polylactic acid 88 having a glass transition temperature of 60 to 65 占 폚, 1 to 2 parts by weight of D-lactic acid and 99 to 98 parts by weight of L-lactic acid based on 100 parts by weight of crystalline polylactic acid (PLA) Weight part; And 12 parts by weight of polybutylene succinate (PBS) were added 12 parts by weight of tributyl citrate as a plasticizer, 12 parts by weight of calcium carbonate as an inorganic filler; 0.13 parts by weight of peroxide as a molecular weight regulator; And 0.15 part by weight of a first oxidation inhibitor and 0.15 part by weight of a second antioxidant as a processing additive were mixed and extrusion molded into a film having a thickness of 30 μm. (The constituent materials and methods except for the content of this comparative example are the same as those used in Example 1).

Tensile strength (kgf / cm), elongation percentage (%) and thermal fusion strength (kgf / cm) of the film prepared in Comparative Example 2 were measured and the results are shown in Figs. 1 to 3 and Table 1 .

Table 1. Results of measurement of tear strength (kgf / cm), elongation (%), and heat fusion strength (kgf / cm) of the examples and comparative examples according to the present invention.

Claims (16)

To 100 parts by weight of polyester-based resin containing polylactic acid,
Biodegradable resin composition comprising 10 to 40 parts by weight of a plasticizer and 0.3 to 1.5 parts by weight of a molecular weight regulator. The method of claim 1,
To 100 parts by weight of polyester-based resin containing polylactic acid,
Biodegradable resin composition further comprising 1 to 30 parts by weight of the inorganic filler and 0.3 to 1.5 parts by weight of the processing additive. The method of claim 1,
The polyester resin is a biodegradable resin composition, characterized in that it comprises 70 to 100% by weight of polylactic acid. The method of claim 1,
Wherein the polylactic acid is a biodegradable resin composition wherein the crystalline polylactic acid: amorphous polylactic acid is 1: 0.3 to 3.0 weight ratio. The method of claim 1,
The polyester resin may be selected from the group consisting of polybutylene succinate, polybutylene adipate-co-terpalate, polybutylene succinate-co-adipate, polyhydroxyalkanoate, polyhydroxybutyrate and polypropylene carbonate Wherein the biodegradable resin composition further comprises one or more selected. The method of claim 1,
The plasticizer is a biodegradable resin composition, characterized in that at least one selected from citrate-based plasticizer, triacetin, and polyethylene glycol. The method according to claim 6,
The citrate-based plasticizer is at least one selected from tributyl citrate, triethyl citrate, triethylhexyl citrate, acetyl tributyl citrate. The method of claim 1,
The molecular weight regulator is a biodegradable resin composition, characterized in that at least one selected from peroxide, diisocyanate, crosslinking agent, modified acrylic resin and modified imide resin. The method of claim 8,
The peroxide may be selected from the group consisting of dibenzoyl peroxide, 2,5-dimethyl-2,5-di (t-butylperoxy) -hexane, di- And dicumyl peroxide. ≪ RTI ID = 0.0 > 11. < / RTI > The method of claim 8,
Wherein the diisocyanate is at least one selected from the group consisting of toluene diisocyanate, diphenylmethane diisocyanate, hexamethylene diisocyanate, and isophorone diisocyanate. The method of claim 8,
Wherein the crosslinking agent is biodegradable, characterized in that triaryl isocyanurate, trimethylolpropane triacrylate, butyl acrylate methyl methacrylate branched copolymer, butyl acrylate rubber-styrene copolymer, styrene acrylic copolymer Resin composition. The method of claim 8,
Wherein the cross-linking agent is at least one selected from the group consisting of modified uretoimine, polycarbodiimide, bis- (2,6-diisopropylphenyl) carbomide, and monomercarbodiimide. 3. The method according to claim 1 or 2,
To 100 parts by weight of polyester-based resin containing polylactic acid,
The additive for processing is a biodegradable resin composition, characterized in that at least one selected from 0.1 to 0.5 parts by weight of antioxidant, 0.1 to 0.5 parts by weight of amide wax, and 0.5 to 1.0 parts by weight of stearized wax. The method of claim 13,
The additive for processing further comprises a UV stabilizer, a pigment, or a mixture thereof. A method for producing a film using the biodegradable resin composition according to claim 1. A film produced by the manufacturing method of claim 15.

Images