KR20140074715A - Emulsion composition comprising polyalkyene carbonate and polylactic acid and biodegradable molded article produced therefrom - Google Patents

Abstract

The present invention relates to an emulsion composition including polyalkylene carbonate and polylactide and a biodegradable molded product produced from the same. The emulsion composition according to the present invention has excellent mechanical properties such as tensile strength, elasticity, and elongation rates and exhibits biodegradation properties. Accordingly, the emulsion composition can be applied as an environmentally-friendly material widely to various fields including not only the field of disposable molded products such as disposable gloves, packing films, disposable cups, disposable dishes, etc. but also the field of construction materials and the field of vehicle interior materials.

Description

TECHNICAL FIELD [0001] The present invention relates to an emulsion composition comprising a polyalkylene carbonate and a polylactide, and a biodegradable molded article prepared from the emulsion composition and a biodegradable molded article obtained from the emulsion composition. ≪ Desc / Clms Page number 1 >

The present invention relates to an emulsion composition comprising a polyalkylene carbonate and a polylactide, and a biodegradable molded article produced therefrom.

In recent years, disposable plastic molded articles have been widely used, such as disposable gloves, packaging films, disposable containers such as disposable cups and disposable dishes, and rubber molded articles for building materials and automobile interior materials. For example, disposable gloves are difficult to recycle after being used. They are widely used in industrial fields such as medical field or chemical / chemical field. In recent years, they are widely used in various fields related to hygiene or human health such as food and cosmetics And are consumed.

Such disposable resin molded articles, such as disposable gloves, etc., can be made from a variety of resins that are thin, elastic, and have rubber-like properties. For example, synthetic polyisoprene, polychloroprene, polyurethane, polyvinyl chloride, polystyrene butadiene styrene, styrene isoprene styrene, silicone, polybutadiene methyl methacrylate, polyacrylonitrile or polystyrene ethylene butylene styrene Or from various resins having similar properties.

However, disposable resin molded articles produced from these resins are difficult to be decomposed environmentally after use, and there is a possibility of causing environmental pollution due to generation of noxious gas due to incomplete combustion or incineration at the time of filling.

For this reason, attempts have been made to produce a disposable resin molded article from various resins having biodegradability. However, it has been attempted to produce a disposable resin molded article having biodegradability by using various resorbable resins such as disposable plastic molded articles such as disposable gloves, Disposable resin molded articles satisfying mechanical properties have not been developed.

Accordingly, the present invention is to provide an emulsion composition capable of providing a molded article having biodegradability with properties similar to rubber.

The present invention also provides a biodegradable molded article produced from the emulsion composition.

According to the present invention,

A polyalkylene carbonate comprising a repeating unit represented by the following formula (1); And

A polylactide comprising a repeating unit represented by the following formula (2)

There is provided an emulsion composition for manufacturing a biodegradable molded article comprising:

[Chemical Formula 1]

In Formula 1,

R ¹ to R ⁴ are each independently hydrogen, a linear or branched alkyl group having 1 to 20 carbon atoms, an aryl group having 6 to 20 carbon atoms, an alkenyl group having 1 to 20 carbon atoms, or a cycloalkyl group having 3 to 20 carbon atoms; At least any two of R ¹ to R ⁴ may be connected to each other to form a cycloalkyl group having 3 to 10 carbon atoms;

n is an integer from 10 to 1,000;

(2)

In Formula 2, m is an integer of 1 to 6,000.

The emulsion composition may comprise 1 to 50 parts by weight of the polylactide, based on 100 parts by weight of the polyalkylene carbonate.

And, the polyalkylene carbonate may have a weight average molecular weight of 10,000 to 1,000,000; The polylactide may have a weight average molecular weight of 100,000 to 1,000,000.

In particular, according to the present invention, the emulsion composition comprises a continuous phase comprising water; And

Shell particles having a shell dispersed in the continuous phase and comprising a core comprising the polyalkylene carbonate, the polylactide, and a solvent, and a surfactant surrounding the core.

The core-shell particles may include 50 to 1200 parts by weight of the solvent, and 1 to 20 parts by weight of the surfactant, based on 100 parts by weight of the resin including the polyalkylene carbonate and the polylactide.

And, the emulsion composition may have a solid content of 5 to 50% by weight based on the total weight.

On the other hand, according to the present invention,

Preparing an organic solution comprising a polyalkylene carbonate containing a repeating unit represented by the formula (1), a polylactide containing a repeating unit represented by the formula (2), and a solvent;

Preparing an aqueous solution comprising a surfactant; And

Mixing the organic solution and the aqueous solution to form an emulsion

A method for producing an emulsion composition for manufacturing a biodegradable molded article, comprising the steps of:

According to the present invention, there is also provided a biodegradable molded article produced from the emulsion composition.

Here, the biodegradable molded article may comprise a disposable glove, a disposable film, a disposable container, or a disposable rubber article.

The biodegradable molded article can be produced by a method including the step of applying the emulsion composition described above to a mold and drying the emulsion composition without a separate crosslinking step.

The emulsion composition according to the present invention can exhibit biodegradability with excellent mechanical properties such as tensile strength, elasticity and elongation. Therefore, the emulsion composition can be widely applied as an environmentally friendly material in various fields such as disposable gloves, packaging films, disposable cups, disposable dishes, as well as building materials and automobile interior materials.

Hereinafter, an emulsion composition according to a specific embodiment of the present invention and a biodegradable molded product produced from the emulsion composition will be described.

Prior to that, unless expressly stated otherwise, some terms used throughout this specification are defined as follows.

Prior to that, unless explicitly stated throughout the present specification, the terminology is for reference only, and is not intended to limit the invention.

And, the singular forms used herein include plural forms unless the phrases expressly have the opposite meaning.

Also, as used herein, the term " comprises " embodies specific features, regions, integers, steps, operations, elements or components, and does not exclude the presence of other specified features, regions, integers, steps, operations, elements, It does not.

In the present specification, the term 'disposable resin molded article' is not used semi-permanently or permanently, but is discarded after being used within one or several times, for example, within 10 times, preferably within 5 times Refers to any resin molded article that is cleaned or reprocessed through a predetermined process. Such "disposable resin molded articles" may include or consist of a resin layer that meets a range of elongation and strength similar to rubber. Examples of such molded articles may include disposable gloves, disposable films, disposable cups, disposable containers such as disposable dishes, and building materials or automotive interiors. The use of such a disposable resin molded article is not particularly limited and may include molded articles used in various fields such as medical, chemical, chemical, food or cosmetic.

On the other hand, the inventors of the present invention have found that when emulsion compositions containing polyalkylene carbonate and polylactide are used in the course of research on biodegradable resins, mechanical properties such as elongation and tensile strength, It was confirmed that it is possible to provide an excellent molded article. Furthermore, the present inventors have completed the present invention by confirming that the emulsion composition can form a resin film having a uniform thickness and excellent mechanical properties more stably through a simple method such as deep molding or coating without a separate crosslinking step.

According to an embodiment of the present invention,

A polyalkylene carbonate comprising a repeating unit represented by the following formula (1); And

A polylactide comprising a repeating unit represented by the following formula (2)

There is provided an emulsion composition for manufacturing a biodegradable molded article comprising:

[Chemical Formula 1]

In Formula 1,

R ¹ to R ⁴ are each independently hydrogen, a linear or branched alkyl group having 1 to 20 carbon atoms, an aryl group having 6 to 20 carbon atoms, an alkenyl group having 1 to 20 carbon atoms, or a cycloalkyl group having 3 to 20 carbon atoms; At least any two of R ¹ to R ⁴ may be connected to each other to form a cycloalkyl group having 3 to 10 carbon atoms;

n is an integer from 10 to 1,000;

(2)

In Formula 2, m is an integer of 1 to 6,000.

Among them, the polyalkylene carbonate is an amorphous polymer containing the repeating unit represented by the formula (1), unlike the aromatic polycarbonate which is a similar engineering plastic, is biodegradable and pyrolyzable at a low temperature , It has the advantage that it is completely decomposed into carbon dioxide and water and there is no carbon residue. In addition, the polyalkylene carbonate can be controlled within this range with a relatively low glass transition temperature (Tg) of about 40 ° C or less, for example, about 10 to 40 ° C (Inoue et al. Polymer J. , 1982, 14, 327-330).

These polyalkylene carbonates can be obtained through copolymerization using epoxide-based compounds and carbon dioxide as monomers in the presence of an organometallic catalyst. The epoxide compound may be at least one compound selected from the group consisting of ethylene oxide, propylene oxide, 1-butene oxide, 2-butene oxide, isobutylene oxide, 1-pentene oxide, 2-pentene oxide, 1-hexene oxide, Pentene oxide, cyclohexene oxide, styrene oxide or butadiene monoxide, and the like, or a combination of two or more different epoxy compounds selected from the foregoing.

Such a polyalkylene carbonate may be a homopolymer containing a repeating unit represented by the above formula (1); Or a copolymer comprising two or more kinds of repeating units belonging to the general formula (1), or a copolymer comprising an alkylene oxide repeating unit and the like together with the repeating unit represented by the general formula (1).

However, the polyalkylene carbonate may contain one or more repeating units of the repeating unit represented by the formula (1) so that specific physical properties (for example, biodegradability or low glass transition temperature, etc.) More preferably at least about 40 mole%, more preferably at least about 60 mole%, more preferably at least about 80 mole% of the copolymer.

In the repeating unit represented by Formula 1, R ¹ to R ⁴ are each independently selected from the group consisting of hydrogen, a linear or branched alkyl group having 1 to 20 carbon atoms, an aryl group having 6 to 20 carbon atoms, an alkenyl group having 1 to 20 carbon atoms, A cycloalkyl group having 3 to 20 carbon atoms; At least any two of R ¹ to R ⁴ may be connected to each other to form a cycloalkyl group having 3 to 10 carbon atoms. At this time, R ¹ to R ⁴ may be selected as appropriate functional groups in consideration of mechanical properties or biodegradability of the polyalkylene carbonate finally obtained. For example, when the functional group is hydrogen or a functional group having a relatively small number of carbon atoms, it may be more advantageous in terms of biodegradability, and in the case of a functional group having a relatively large number of carbon atoms, it may be advantageous in terms of mechanical properties such as strength of the resin. As a specific example, it has been reported that polyethylene carbonate is biodegraded more rapidly than polypropylene carbonate (Inoue et al. Chem . Pharm . Bull , Jpn , 1983, 31, 1400; Ree et al. Catalysis Today , 2006, 115, 288-294).

In the polyalkylene carbonate, the degree of polymerization n of the repeating unit represented by the formula (1) may be 10 to 1,000, preferably 50 to 500. The polyalkylene carbonate containing the repeating unit may have a weight average molecular weight of about 10,000 to about 1,000,000, preferably about 50,000 to about 500,000. As the polyalkylene carbonate has the degree of polymerization and the weight average molecular weight, the molded article obtained from the polyalkylene carbonate can exhibit biodegradability along with mechanical properties such as appropriate strength.

On the other hand, the polylactide is a polymer containing the repeating unit represented by the above formula (2) and is based on biomass, so that the production of carbon dioxide is less in production than conventional resins based on crude oil, It is possible to utilize and biodegrade at the time of landfilling, and it is getting attention as an environmentally friendly material.

The polylactide may be prepared by direct polycondensation of lactic acid or by ring opening polymerization of lactide monomer under an organometallic catalyst.

Among them, in the formation of the polylactide by the ring-opening polymerization of the lactide monomer, at least one selected from the group consisting of D-lactide, L-lactide and meso-lactide from which moisture has been removed Can be used.

In such a polylactide, the polymerization degree m of the repeating unit represented by the formula (2) may be 1 to 6,000, preferably 100 to 3,000. And, the polylactide containing the repeating unit may have a weight average molecular weight of about 100,000 to about 1,000,000, preferably about 200,000 to about 800,000. As the polylactide has the polymerization degree and the weight average molecular weight, the molded article obtained from the polylactide can exhibit biodegradability along with mechanical properties such as appropriate strength.

Meanwhile, the emulsion composition according to the present invention includes the polyalkylene carbonate and the polylactide described above, and the mixing ratio thereof is not particularly limited.

However, the content of the polylactide contained in the emulsion composition is 1 to 50 parts by weight, preferably 1 to 45 parts by weight, more preferably 5 to 35 parts by weight, based on 100 parts by weight of the polyalkylene carbonate .

That is, since the emulsion composition includes the polyalkylene carbonate and the polylactide, the polyalkylene carbonate can exhibit improved tensile strength and elasticity as compared with the inherent properties of the polyalkylene carbonate. In order to sufficiently exhibit such effects, The polylactide is preferably contained in an amount of 1 part by weight or more based on 100 parts by weight of the polyalkylene carbonate. However, if the content of the polylactide contained in the emulsion composition exceeds a certain level, the mechanical properties such as tensile strength, elasticity and elongation may be somewhat lowered. Therefore, the polylactide is preferably a polylactide having a weight of 100 And 50 parts by weight or less based on 100 parts by weight of the resin.

Meanwhile, the emulsion composition according to the present invention may be an oil-in-water type emulsion composition in which small particles containing the above-mentioned polyalkylene carbonate and polylactide are dispersed in water.

As an example, the emulsion composition according to the present invention may contain,

A continuous phase comprising water; And

Shell particles having a shell dispersed in the continuous phase and comprising a core comprising the polyalkylene carbonate, the polylactide, and a solvent, and a surfactant surrounding the core.

That is, the emulsion composition of this embodiment is a core-shell particle in which a discontinuous phase in the form of core-shell particles is dispersed in a continuous phase containing water, wherein the core and the shell particle have a structure in which the polyalkylene carbonate and the polylactide And the surfactant surrounding the core may be a shell.

Here, the description of the polyalkylene carbonate and the polylactide contained in the core of the core-shell particle is omitted.

On the other hand, the solvent contained in the core is not particularly limited as long as the polyalkylene carbonate and the polylactide are soluble. However, according to the present invention, the solvent is selected from the group consisting of methyl acetate, ethyl acetate, propyl acetate, isopropyl acetate, vinyl acetate, methyl ethyl ketone, dichloromethane, dichloroethane, chloroform, acetonitrile, methylpyrrolidone, dimethylsulfoxide, At least one compound selected from the group consisting of nitromethane, nitropropane, caprolactone, acetone, polypropylene oxide, tetrahydrofuran, benzene, and styrene.

The content of the solvent may be determined in consideration of the formation efficiency and stability of the core-shell particles. According to the present invention, the solvent is used in an amount of 50 to 1200 parts by weight, preferably 100 to 1100 parts by weight, more preferably 300 to 1000 parts by weight, per 100 parts by weight of the resin comprising polyalkylene carbonate and polylactide .

According to the present invention, the surfactant may be at least one compound selected from the group consisting of an anionic surfactant and a nonionic surfactant; It may preferably be at least one compound selected from the group consisting of carboxylic acid salts, sulfonic acid salts, sulfuric acid ester salts, phosphoric acid ester salts, quaternary ammonium salts, ether type, ester ether type, ester type, Such a compound is not particularly limited as it can be selected in a conventional manner in the art to which the present invention belongs.

However, according to the present invention, the surfactant may be selected from the group consisting of sodium alkylbenzenesulfonate, sodium alkylsulfonate, polyethylene oxide alkyl ether, polyethylene oxide alkyl phenyl ether, polyethylene oxide alkyl ether sulfonate, polyethylene oxide alkyl ether phosphate, sodium lauryl sulfate, Anionic surfactants such as carbonates, alkyl ether sulfates, alkylaryl ether sulfates, alkylamide sulfates, alkyl phosphates, alkyl ether phosphates, and alkyl aryl ether phosphates; Alkyl polyoxyethylene ether, alkylaryl polyoxyethylene ether, alkylaryl formaldehyde condensed polyoxyethylene ether, block polymer having polyoxypropylene as a hydrophilic group, polyoxyethylene ether of glycerin ester, polyoxyethylene ether of sorbitan ester, Polyoxyethylene fatty acid amides, polyoxyethylene alkyl amines, and amine oxides, such as polyoxyethylene alkyl ethers of sorbitol esters, polyethylene glycol fatty acid esters, glycerin esters, sorbitan esters, propylene glycol esters, sugar esters, fatty acid alkanolamides, polyoxyethylene fatty acid amides, Ionic surfactants; Or a mixture thereof.

Such a surfactant may be contained in an amount of 1 to 20 parts by weight, preferably 1 to 15 parts by weight, more preferably 1 to 10 parts by weight, based on 100 parts by weight of the resin containing the polyalkylene carbonate and the polylactide . In other words, in consideration of problems such as workability and mechanical property deterioration of a molded product which may be caused when an excess amount of a surfactant is added, while the shell surrounding the core can be sufficiently formed, the content of the surfactant should be within the above- .

On the other hand, the core of the core-shell particle may further contain an auxiliary surfactant.

That is, apart from the surfactant contained in the shell of the core-shell particle (hereinafter referred to as the 'main surfactant'), when the core further contains an auxiliary surfactant, the core-shell particles are formed in a more uniform size The formed particles may be more stably dispersed to exhibit improved storage stability, and a molded article having a more uniform thickness can be formed upon application of the emulsion composition.

These co-surfactants serve to minimize the solubility of the core-shell particles in the dispersion medium to minimize aggregation between the particles. Therefore, according to one embodiment of the present invention, in the case of a water solvent, the auxiliary surfactant preferably has a lower hydrophilicity than the main surfactant, more preferably, It is advantageous in the above-mentioned effect realization to use one having a lower HLB (Hydrophile-Lipophile Balance) value than the active agent.

Therefore, the cosurfactant may be selected in view of the above relationship with the main surfactant; Preferably at least one compound selected from the group consisting of alcohols having 10 to 40 carbon atoms, alkanes having 10 to 40 carbon atoms, mercaptans, carboxylic acids, ketones, amines, and nonionic surfactants having HLB 11 or less . According to one embodiment of the present invention, such cosurfactant is selected from the group consisting of hexadecane, cetyl alcohol, polyoxyethylene stearyl ether, polyoxyethylene stearylamine, polyoxyethylene stearyl ester, polyoxyethylene monostearate, polyoxy Polyoxyethylene lauryl ether, ethoxylated alcohols having 10 to 20 carbon atoms, ethoxylated octylphenol, ethoxylated fatty esters, sorbitan laurate, sorbitan monostearate, propylene glycol monostearate, sorbitan monostearate, Ethylene glycol monostearate, sorbitan fatty acid ester, polyoxyethylene sorbitan fatty acid ester, or a mixture thereof.

Such an auxiliary surfactant may be contained in an amount of 1 to 20 parts by weight, preferably 1 to 15 parts by weight, more preferably 1 to 10 parts by weight, based on 100 parts by weight of the resin containing the polyalkylene carbonate and the polylactide have. That is, considering the difficulty in controlling the particle size and composition stability that may occur when an excessive amount of the co-surfactant is added, and the change in physical properties of the resin molding, while giving the minimum effect that the core-shell particles can be more stably formed, It is advantageous that the content of the cosurfactant is in the above-mentioned range.

Furthermore, the weight ratio of cosurfactant to said main surfactant is from 1: 0.1 to 1: 2, preferably from 1: 0.2 to 1: 1, more preferably from 1: Preferably 1: 0.3 to 1: 0.6.

The emulsion composition may have a solid content of 5 to 50% by weight, preferably 5 to 40% by weight, and more preferably 5 to 30% by weight, based on the total weight of the composition, . At this time, the viscosity of the composition may be advantageously from 1 to 70 cp, preferably from 2 to 10 cp, and more preferably from 3 to 5 cp in terms of processability and the like.

The emulsion composition according to an embodiment of the present invention may further contain additives such as a defoaming agent and a water-soluble polymer in order to exhibit more uniform physical properties upon application of the composition. At this time, as the antifoaming agent, those which are customary in the technical field to which the present invention belongs can be used, and therefore the constitution thereof is not particularly limited, but may preferably be a silicone type antifoaming agent. The antifoaming agent may be added in an amount of 0.001 to 0.1 part by weight based on the total weight of the composition. The water-soluble polymer may include polyvinyl alcohol, polyacrylic acid, polymethacrylic acid, and the like.

Meanwhile, according to another embodiment of the present invention,

Preparing an organic solution comprising a polyalkylene carbonate containing a repeating unit represented by the formula (1), a polylactide containing a repeating unit represented by the formula (2), and a solvent;

Preparing an aqueous solution comprising a surfactant; And

Mixing the organic solution and the aqueous solution to form an emulsion

A method for producing an emulsion composition for manufacturing a biodegradable molded article, comprising the steps of:

The emulsion composition may be prepared in the oil-in-water type, which is conventional in the art, except that the above-mentioned polyalkylene carbonate, polylactide, solvent, surfactant and the like are used. For example, a direct emulsification method or a phase inversion emulsification method, and the like.

According to an embodiment of the present invention, in the method for producing the emulsion composition, the organic solution may be prepared by adding the polyalkylene carbonate and the polylactide to the solvent and completely dissolving the same using a homogenizer. At this time, a more homogeneous organic solution can be obtained by further adding the aforementioned cosurfactant together with the above components. Separately, the emulsion composition can be prepared by preparing an aqueous solution containing a surfactant, and then stabilizing each of the prepared organic solution and aqueous solution by mixing and stirring.

At this time, the type and content of each component are replaced with the above contents, and each step of the above production method can be performed in consideration of the content ratio of each component, the solid content, the viscosity of the composition, and the like.

On the other hand, according to another embodiment of the present invention, there is provided a biodegradable molded article produced from the above-mentioned emulsion composition.

Here, the biodegradable molded article may be a disposable glove, a disposable film, a disposable container, or a disposable rubber molded article.

The biodegradable molded article may comprise or consist of a resin film formed from the emulsion composition according to the present invention. Examples of such molded articles include disposable gloves, disposable films, disposable containers such as disposable cups or disposable dishes, disposable rubber or resin molded articles which are used as building materials or automobile interior materials, and which can be incinerated. The use of such a disposable resin molded article is not particularly limited, and may include a molded article used in various fields such as medicine, chemistry, chemical industry, foodstuff or cosmetics.

The biodegradable molded article can be produced by applying the above-mentioned emulsion composition to a mold having a molded product form and drying (or curing) the emulsion composition. That is, the biodegradable molded article according to the present invention can be produced by a simplified process including a step of applying the emulsion composition and drying the moisture without a separate crosslinking step.

Best Mode for Carrying Out the Invention Hereinafter, preferred embodiments are described to facilitate understanding of the present invention. It is to be understood, however, that the following examples are for illustrative purposes only and are not intended to limit the scope of the invention.

Example  One

An organic solution prepared by mixing about 720 g of dichloromethane, about 2.6 g of hexadecane, about 72 g of polyethylene carbonate (weight average molecular weight: 200,000) and about 8 g of polylactide (weight average molecular weight: 200,000) Respectively.

Separately, about 5.2 g of a surfactant (sodium dodecylbenzenesulfonate) was added to about 300 g of distilled water and stirred to prepare an aqueous solution containing a surfactant.

The emulsion composition was prepared by slowly stirring the organic solution into the aqueous solution and stirring the solution at about 10,000 rpm for about 20 minutes to stabilize the emulsion composition. Thereafter, dichloromethane contained in the composition was removed using a rotary evaporator.

Example  2

An organic solution prepared by mixing about 720 g of dichloromethane, about 2.6 g of hexadecane, about 64 g of polyethylene carbonate (weight average molecular weight: 200,000) and about 16 g of polylactide (weight average molecular weight: 200,000) Respectively.

Separately, about 5.2 g of a surfactant (sodium dodecylbenzenesulfonate) was added to about 300 g of distilled water and stirred to prepare an aqueous solution containing a surfactant.

The emulsion composition was prepared by slowly stirring the organic solution into the aqueous solution and stirring the solution at about 10,000 rpm for about 20 minutes to stabilize the emulsion composition. Thereafter, dichloromethane contained in the composition was removed using a rotary evaporator.

Example  3

An organic solution prepared by mixing about 720 g of dichloromethane, about 2.6 g of hexadecane, about 56 g of polyethylene carbonate (weight average molecular weight: 200,000) and about 24 g of polylactide (weight average molecular weight: 200,000) Respectively.

Separately, about 5.2 g of a surfactant (sodium dodecylbenzenesulfonate) was added to about 300 g of distilled water and stirred to prepare an aqueous solution containing a surfactant.

The emulsion composition was prepared by slowly stirring the organic solution into the aqueous solution and stirring the solution at about 10,000 rpm for about 20 minutes to stabilize the emulsion composition. Thereafter, dichloromethane contained in the composition was removed using a rotary evaporator.

Manufacturing example

The glass mold to which the calcium nitrate was applied was dipped in the composition according to Example 1 and Example 2 for about 15 seconds, respectively, and the water was dried at about 130 캜 to form a resin layer. Thereafter, it was leached in flowing water for about 1 minute, and then the water was dried at about 130 캜 to obtain a resin layer (Preparation Example 1 and Production Example 2) of about 55 탆 thick.

Separately, a resin layer having a thickness of about 55 占 퐉, prepared using a composition comprising polyethylene carbonate (weight average molecular weight: 200,000) used in Example 1 and Example 2, was prepared as a control.

Experimental Example

The following tests were performed on the resin layers of the preparation examples and the control examples, and the results are shown in Table 1 below.

(1) Tensile strength (TS max, MPa): Five dumbbell specimens were prepared in accordance with ASTM D 412, and tested using a Zwick / Roell Zwick / Z010 model at 500 mm / min Tensile strength was measured. The averages of the 5 tests in total were expressed as the results.

(2) elongation (%): The elongation until the specimen was cut under the same conditions as the above tensile strength measurement was measured, and the average value of the test was measured five times in total.

(3) Modulus (Young's modulus, MPa): The slope of the initial 0 to 1% strain interval was calculated on the stress-strain curve shown in the tensile strength measurement of the specimen using a universal testing machine (UTM). The results were expressed as the results of a total of 5 tests for the elastic modulus at 300% elongation and elastic modulus at 500% elongation, respectively.

Composition The tensile strength
(MPa) Elongation
(%) Modulus at 300% elongation (MPa) Modulus at 500% elongation (MPa) Production Example 1 Example 1 15 743 5.89 8.57 Production Example 2 Example 2 8.21 616 5.02 7.44 Control Example PEC 12 853 3.8 4.9

Referring to Table 1, the resin layers according to Production Example 1 and Production Example 2 were produced from the emulsion composition comprising polyethylene carbonate and polylactide, so that the resin layer according to Production Example 1 and Production Example 2 was 300% and 500 % Elastic modulus at the elongation was high and it was confirmed that the tensile strength could be improved.

Claims (16)

A polyalkylene carbonate comprising a repeating unit represented by the following formula (1); And
A polylactide comprising a repeating unit represented by the following formula (2)
≪ RTI ID = 0.0 > emulsion < / RTI > composition for making a biodegradable molded article:
[Chemical Formula 1]

In Formula 1,
R ¹ to R ⁴ are each independently hydrogen, a linear or branched alkyl group having 1 to 20 carbon atoms, an aryl group having 6 to 20 carbon atoms, an alkenyl group having 1 to 20 carbon atoms, or a cycloalkyl group having 3 to 20 carbon atoms; At least any two of R ¹ to R ⁴ may be connected to each other to form a cycloalkyl group having 3 to 10 carbon atoms;
n is an integer from 10 to 1,000;
(2)

In Formula 2, m is an integer of 1 to 6,000.
The method according to claim 1,
And 1 to 50 parts by weight of the polylactide relative to 100 parts by weight of the polyalkylene carbonate.
The method according to claim 1,
Wherein the polyalkylene carbonate has a weight average molecular weight of 10,000 to 1,000,000.
The method according to claim 1,
Wherein the polylactide has a weight average molecular weight of 100,000 to 1,000,000.
The method according to claim 1,
A continuous phase comprising water; And
A core-shell particle having a core dispersed in the continuous phase and comprising a core comprising the polyalkylene carbonate, the polylactide, and a solvent, and a surfactant surrounding the core;
≪ / RTI >
6. The method of claim 5,
Wherein the core-shell particles comprise 50 to 1200 parts by weight of the solvent, and 1 to 20 parts by weight of the surfactant, based on 100 parts by weight of the resin comprising the polyalkylene carbonate and the polylactide, .
6. The method of claim 5,
Wherein the emulsion composition has a solids content of 5 to 50% by weight based on the total weight of the emulsion composition.
6. The method of claim 5,
The solvent is selected from the group consisting of methyl acetate, ethyl acetate, propyl acetate, isopropyl acetate, vinyl acetate, methyl ethyl ketone, dichloromethane, dichloroethane, chloroform, acetonitrile, methylpyrrolidone, dimethylsulfoxide, nitromethane, Wherein the emulsion composition is at least one compound selected from the group consisting of lactone, acetone, polypropylene oxide, tetrahydrofuran, benzene, and styrene.
6. The method of claim 5,
Wherein the surfactant is at least one compound selected from the group consisting of carboxylate, sulfonate, sulfate ester, phosphate ester, quaternary ammonium salt, ether, ester ether, ester, Emulsion composition.
6. The method of claim 5,
Wherein the core comprises at least one cosurfactant selected from the group consisting of alcohols having 10 to 40 carbon atoms, alkanes having 10 to 40 carbon atoms, mercaptans, carboxylic acids, ketones, amines and nonionic surfactants having a HLB of 11 or less Further comprising an emulsion composition for producing a biodegradable molded article.
11. The method of claim 10,
Wherein the cosurfactant is contained in an amount of 1 to 20 parts by weight based on 100 parts by weight of the resin comprising the polyalkylene carbonate and the polylactide.
11. The method of claim 10,
Wherein the cosurfactant is contained in a weight ratio of 1: 0.1 to 1: 2 with respect to the surfactant contained in the shell of the core-shell particle.
Preparing an organic solution comprising a polyalkylene carbonate containing a repeating unit represented by the following formula (1), a polylactide containing a repeating unit represented by the following formula (2), and a solvent;
Preparing an aqueous solution comprising a surfactant; And
Mixing the organic solution and the aqueous solution to form an emulsion
A method for producing an emulsion composition for producing a biodegradable molded article comprising:
[Chemical Formula 1]

In Formula 1,
R ¹ to R ⁴ are each independently hydrogen, a linear or branched alkyl group having 1 to 20 carbon atoms, an aryl group having 6 to 20 carbon atoms, an alkenyl group having 1 to 20 carbon atoms, or a cycloalkyl group having 3 to 20 carbon atoms; At least any two of R ¹ to R ⁴ may be connected to each other to form a cycloalkyl group having 3 to 10 carbon atoms;
m is an integer from 10 to 1,000;
(2)

In Formula 2, m is an integer of 1 to 6,000.
A biodegradable molded article produced from the emulsion composition according to claim 1.
15. The method of claim 14,
Disposable gloves, disposable films, disposable containers, or disposable rubber molded articles.
A process for producing a biodegradable molded article, comprising applying the emulsion composition according to claim 1 to a mold and drying.