KR102495995B1 - Biodegradable resin composition, its manufacturing method, and biodegradable fresh food storage bag manufactured therefrom - Google Patents

Abstract

The present invention relates to a biodegradable resin composition and a biodegradable fresh food storage bag, and more particularly, to a biodegradable resin composition prepared by mixing inorganic substances into a biodegradable resin composition to produce a biodegradable functional film to produce an bag , It relates to a biodegradable resin composition that removes gas in the bag and extends the lifespan of food, a manufacturing method thereof, and a biodegradable fresh food storage bag prepared therefrom.
In the present invention, based on 100 parts by weight of the biodegradable resin, 2 to 8 parts by weight of an inorganic material, 0.05 to 0.15 parts by weight of a primary antioxidant, 0.1 to 0.2 parts by weight of a secondary antioxidant, 0.2 to 0.4 parts by weight of a dispersant, and 0.6 to 1 part by weight of a lubricant A biodegradable resin composition containing 0.3 to 0.7 parts by weight and a pigment, a method for preparing the same, and a biodegradable fresh food storage bag prepared therefrom are provided.

Description

Biodegradable resin composition, its manufacturing method, and biodegradable fresh food storage bag manufactured therefrom

The present invention relates to a biodegradable resin composition and a biodegradable fresh food storage bag, and more particularly, to a biodegradable resin composition prepared by mixing inorganic substances into a biodegradable resin composition to produce a biodegradable functional film to produce an bag , It relates to a biodegradable resin composition that removes gas in the bag and extends the lifespan of food, a manufacturing method thereof, and a biodegradable fresh food storage bag prepared therefrom.

Plastic film is a polymer material that is relatively heat-safe, rust-free, and does not decompose by light or moisture, along with excellent light weight, moldability, processability, and economic feasibility. It is being used for various purposes ranging from industrial materials to disposable consumables by replacing existing materials such as

However, since most of the plastic films used for industrial packaging, food packaging, living, agricultural and horticultural use, etc. have been in a state that has not been decomposed in nature for more than 100 years, they are degraded to processed waste, which is waste plastic film. Due to the problem of global warming caused by the increase in carbon dioxide generated, movements to reduce its use are becoming active.

Accordingly, major countries around the world are strengthening regulations on non-degradable plastics.

Environmental issues such as global warming and resource issues such as the depletion of petrochemical-based raw materials are increasingly emerging as serious issues, and the whole world is interested in eco-friendly materials for sustainable development.

In particular, plastic films often used for packaging or food waste films include polyvinyl chloride (PVC), polyethylene (PE), polypropylene (PP), nylon, and polyethylene terephthalate (PET). However, these films generate harmful substances such as dioxin when incinerated, and when landfilled without special treatment after being used for packaging, they are hardly decomposed due to chemical and biological stability and accumulate in the ground, shortening the lifespan of landfills and causing soil contamination problems. causes

Accordingly, recently, a solution to the above problems has been proposed using a biodegradable resin, and examples of the biodegradable resin include cellulose-based resins, starch-based resins, and biodegradable polyester-based resins.

Such a resin may be biodegraded by the action of enzymes produced by microorganisms existing in the environment, decomposed into low molecular weight substances, and finally decomposed into water and carbon dioxide.

Therefore, it is desired to develop a packaging material using a biodegradable film having the same effect instead of a packaging material using a plastic film in use, and an improvement plan for this is required for long-term distribution and preservation of packaged food.

Republic of Korea Patent No. 10-1813633 (2017.12.22.) Republic of Korea Registered Utility No. 20-0389024 (2005.07.07.)

The present invention has been made to solve the above problems, and an object of the present invention is to reduce environmental pollution by manufacturing a bag for storing fresh food using a biodegradable resin, and to remove gas discharged from fresh food. It is to provide a biodegradable resin composition that extends the lifespan of fresh food, a biodegradable film prepared therefrom, and a method for manufacturing a biodegradable fresh food storage bag.

In order to achieve the above object, according to a preferred embodiment of the present invention, 2 to 8 parts by weight of an inorganic material, 0.05 to 0.15 parts by weight of a primary antioxidant, and 0.1 to 0.2 parts by weight of a secondary antioxidant, based on 100 parts by weight of the biodegradable resin. and 0.2 to 0.4 parts by weight of a dispersant, 0.6 to 1 part by weight of a lubricant, and 0.3 to 0.7 parts by weight of a pigment.

According to a preferred embodiment, the biodegradable resin is polybutylene adipate perephthalate (PBAT) 80 to 90% by weight, polylactic acid (PLA) 5 to 10% by weight and polybutylene succinate (PBS) 5 to 10% by weight Characterized in that it contains %.

According to a preferred embodiment, the inorganic material is characterized in that it includes at least one selected from the group consisting of illite, zeolite, and porous silica.

According to a preferred embodiment, 80 to 90% by weight of a biodegradable resin, polybutylene adipate ferephthalate (PBAT), 5 to 10% by weight of polylactic acid (PLA), and 5 to 10% by weight of polybutylene succinate (PBS) A biodegradable resin mixing step of adding and mixing the biodegradable resin into a mixer, an inorganic material addition step of adding 2 to 8 parts by weight of an inorganic material to the biodegradable resin put into the mixer, and a primary antioxidant as an additive to the biodegradable resin composition in which the inorganic material is mixed. 0.05 to 0.15 parts by weight, 0.1 to 0.2 parts by weight of a secondary antioxidant, 0.2 to 0.4 parts by weight of a dispersant, 0.6 to 1 part by weight of a lubricant, and 0.3 to 0.7 parts by weight of a pigment are added in small amounts.

According to a preferred embodiment, the mixer includes a mixing body detachably coupled to the inner lower part of the mixer to uniformly mix the biodegradable resin composition, and when mixing the biodegradable resin composition, between the biodegradable resin compositions Prevent the problem of content shortage due to layer separation from occurring.

According to a preferred embodiment, a biodegradable resin film is prepared by introducing pellets prepared through an extruder, including the biodegradable resin composition, into a film forming machine.

According to a preferred embodiment, a biodegradable fresh food storage bag is prepared from the biodegradable resin film.

As described above, the biodegradable resin composition according to the present invention, the manufacturing method thereof, and the biodegradable fresh food storage bag prepared therefrom can reduce environmental pollution, and fresh food through the removal of gas discharged from fresh food. has the advantage of prolonging its lifespan.

In addition, the biodegradable resin composition according to the present invention, its manufacturing method, and the biodegradable fresh food storage bag produced therefrom are made of a functional biodegradable resin film, so that food is not damaged during transportation and is more fresh. There are advantages to being able to.

1 is a flow chart showing a method for preparing a biodegradable resin composition according to a preferred embodiment of the present invention.
Figure 2 is a flow chart showing a method of manufacturing a biodegradable fresh food storage bag according to the present invention.

Advantages and features of the present invention, and methods of achieving them, will become clear with reference to the detailed description of the following embodiments taken in conjunction with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but will be implemented in various different forms, only these embodiments make the disclosure of the present invention complete, and common knowledge in the art to which the present invention belongs. It is provided to fully inform the holder of the scope of the invention, and the present invention is only defined by the scope of the claims.

With reference to the accompanying drawings below, specific details for the practice of the present invention will be described in detail. Like reference numbers refer to like elements, regardless of drawing, and "and/or" includes each and every combination of one or more of the recited items.

Although first, second, etc. are used to describe various components, these components are not limited by these terms, of course. These terms are only used to distinguish one component from another. Accordingly, it goes without saying that the first element mentioned below may also be the second element within the technical spirit of the present invention.

Terms used in this specification are for describing the embodiments and are not intended to limit the present invention. In this specification, singular forms also include plural forms unless specifically stated otherwise in a phrase. As used herein, "comprises" and/or "comprising" does not exclude the presence or addition of one or more other elements other than the recited elements.

Unless otherwise defined, all terms (including technical and scientific terms) used in this specification may be used in a meaning commonly understood by those of ordinary skill in the art to which the present invention belongs. In addition, terms defined in commonly used dictionaries are not interpreted ideally or excessively unless explicitly specifically defined.

Hereinafter, a manufacturing method according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 is a flow chart showing a method for preparing a biodegradable resin composition according to the present invention.

Referring to FIG. 1 , the method for preparing a biodegradable resin composition according to the present invention includes a biodegradable resin mixing step (S10), an inorganic material addition step (S20), and an additive addition step (S30).

First, in the biodegradable resin mixing step (S10), 80 to 90% by weight of a biodegradable resin, polybutylene adipate perephthalate (PBAT), 5 to 10% by weight of polylactic acid (PLA), and polybutylene succinate (PBS) 5 to 10% by weight is added to the mixer and mixed.

The polybutylene adipate perephthalate (PBAT) has high toughness and high temperature resistance due to a flexible aliphatic chain and a rigid aromatic chain contained therein, and has biodegradability due to an ester bond. It serves as a biodegradable resin in the biodegradable resin composition of the present invention.

In addition, the polybutylene adipate perephthalate (PBAT) is included in the biodegradable resin in an amount of 80 to 90% by weight, preferably, the polybutylene adipate perephthalate (PBAT) is included in the biodegradable resin in an amount of 87% by weight % to be included and mixed.

The polylactic acid (PLA) is a polymer produced during condensation polymerization of lactide or lactic acid extracted from plants and has biodegradability, so that it serves as a biodegradable resin in the biodegradable resin composition of the present invention. do.

In addition, the polylactic acid (PLA) is included in the biodegradable resin in an amount of 5 to 10% by weight, and if less than 5% by weight, there is a risk that hardness, transparency, tensile strength, etc., which are advantages of polylactic acid (PLA), may be lost. When the weight % is exceeded, miscibility between polylactic acid (PLA) and other compositions may be significantly reduced, and there is a concern that physical property degradation and appearance defects may occur due to this.

Preferably, the polylactic acid (PLA) is included in the biodegradable resin in an amount of 6.5% by weight to be mixed.

Since the polybutylene succinate (PBS) is a polyester-based thermoplastic polymer resin and has biodegradability because it is completely decomposed into water and carbon dioxide, it serves as a biodegradable resin in the biodegradable resin composition of the present invention.

In addition, the polybutylene succinate (PBS) is contained in 5 to 10% by weight in the biodegradable resin, and when it is less than 5% by weight, there is a concern that the hydrolysis rate, which is an advantage of polybutylene succinate (PBS), is lowered, If it exceeds 10% by weight, the hydrolysis rate is too fast, resulting in a problem that cannot be preserved for a long time.

Preferably, the polybutylene succinate (PBS) is included in the biodegradable resin in an amount of 6.5% by weight to be mixed.

Therefore, in the biodegradable resin mixing step (S10), biodegradable resins such as polybutylene adipate ferephthalate (PBAT), polylactic acid (PLA), and polybutylene succinate (PBS) are sequentially introduced into the mixer, in an appropriate ratio. to be mixed.

Thereafter, 2 to 10 parts by weight of an inorganic material is added to the biodegradable resin in which the biodegradable resin, polybutylene adipate ferephthalate (PBAT), polylactic acid (PLA), and polybutylene succinate (PBS) are mixed in the mixer. It goes through the inorganic material addition step (S20) to be added.

Here, the inorganic material serves to adsorb ethylene gas generated by food in the biodegradable fresh food storage bag manufactured by the biodegradable resin composition.

Preferably, the inorganic material is preferably used in an amount of 2 to 8 parts by weight of one selected from illite, zeolite, and porous silica based on 100 parts by weight of the biodegradable resin.

The illite is a light yellow, white, or black mica-based clay mineral that has a three-layer scale-like structure and has a unique property of exhibiting a silk thread phenomenon when dissolved in water.

At this time, illite is known to have silicic acid, alumina, potassium, iron, etc. as its main constituents, adsorption of heavy metals and organic ions, absorption of odors and toxic gases in the air, generation of dissolved oxygen, activation of water molecules, bacteriostatic action, emission of far-infrared rays, negative ions As it is used for purposes such as evaporation and toxin removal, the illite serves as an inorganic material in the biodegradable resin composition of the present invention.

The illite is preferably included in an amount of 2 to 5 parts by weight, more preferably 3 parts by weight, based on 100 parts by weight of the biodegradable resin.

The zeolite has pores with a size of hundreds of thousands of nanometers or more, so that small molecules can enter the pores and be adsorbed and reacted. .

The zeolite is preferably included in an amount of 5 to 8 parts by weight, more preferably 7 parts by weight, based on 100 parts by weight of the biodegradable resin.

The porous silica has the performance of moving, transporting and adsorbing organic contaminants, and serves as an inorganic material in the biodegradable resin composition of the present invention.

The porous silica is preferably included in an amount of 5 to 8 parts by weight based on 100 parts by weight of the biodegradable resin, so that 7 parts by weight are included.

According to a preferred embodiment, in the step of adding the inorganic material, illite, which is an inorganic material, is added to the biodegradable resin being mixed in a mixer to be mixed, but zeolite or porous silica may be added and mixed.

Next, in the step of adding the additive, 0.05 to 0.15 parts by weight of a primary antioxidant, 0.1 to 0.2 parts by weight of a secondary antioxidant, 0.2 to 0.4 parts by weight of a dispersant, and 0.6 to 0.6 parts by weight of a lubricant are added to the biodegradable resin composition in which the inorganic material is mixed. 1 part by weight and 0.3 to 0.7 parts by weight of the pigment are added in small portions and mixed.

First, it is preferable to use 0.05 to 0.15 parts by weight of the primary antioxidant based on 100 parts by weight of the biodegradable resin.

Here, the primary antioxidant functions to stabilize the polymer by preventing a chain reaction of radicals, has a melting point (melting temperature) of 110 to 130 ° C, and is intended to prevent oxidation and discoloration due to the influence of the external environment. .

According to a preferred embodiment, the primary antioxidant may be phenolic or arylamine-based, but here, a phenol-based antioxidant suitable for plastics may be used, and ADK STAB A0-60 manufactured by ADEKA may be used.

Next, it is preferable to use 0.1 to 0.2 parts by weight of the secondary antioxidant based on 100 parts by weight of the biodegradable resin.

Here, the secondary antioxidant performs the function of decomposing the peroxide to stabilize the polymer by removing the oxygen atoms of the polymer that has already been oxidized, and has a melting point (melting temperature) of 180 to 190 ° C. and to prevent discoloration.

According to a preferred embodiment, the secondary antioxidant may be sulfur-based or phosphorus-based, but phosphorus-based antioxidants are used here, and ADK STAB 2112 manufactured by ADEKA may be used.

Next, as the dispersant serves to reduce friction and abrasion of the polymer surface, ethylene bis stamide (EBS) is preferably used.

At this time, ethylene bis stamide (EBS) is used as an internal and external lubricant for plastics. As a white solid with low toxicity, it improves processability, reduces friction and abrasion on the polymer surface, increases color stability, and disperses solid compound materials. By playing a role of promoting and stabilizing, it is used in packaging containers for food and where lubrication is required.

Ethylene bis stamide (EBS), the dispersing agent, preferably contains 0.2 to 0.4 parts by weight based on 100 parts by weight of the biodegradable resin. There is a problem that works as .

Next, the lubricating oil serves to reduce friction by converting solid friction into liquid friction, and silicone oil is preferably used.

Here, silicone oil is a liquid silicone resin with a relatively low degree of polymerization, and has excellent heat resistance, cold resistance, electrical properties, water resistance, and chemical resistance, and has properties such as releasability, water repellency, and antifoaming properties that are not found in general mineral oil or synthetic oil. Since it does not adversely affect other compositions, it serves as a lubricant in the biodegradable resin composition of the present invention.

The lubricating oil, silicone oil, preferably contains 0.6 to 1 part by weight, more preferably 0.8 part by weight, based on 100 parts by weight of the biodegradable resin.

The pigment serves to impart color to the composition, and titanium oxide, iron oxide, calcium carbonate, chromium oxide, ocher, umber, carbon black, etc. are used, and preferably contain 0.3 to 0.7 parts by weight, more preferably 0.5 parts by weight Include wealth.

Therefore, through the biodegradable resin mixing step (S10), biodegradable resins such as polybutylene adipate ferephthalate (PBAT), polylactic acid (PLA), and polybutylene succinate (PBS) are introduced into a mixer and mixed, and then inorganic substances are mixed. An inorganic material is added to the biodegradable resin introduced into the mixer through the adding step (S20), and then a primary antioxidant and a secondary oxidation agent are added as additives to the biodegradable resin composition in which the inorganic material is mixed through the additive adding step (S30). A biodegradable resin composition is prepared by adding and mixing a small amount of an inhibitor, a dispersant, a lubricant, and a pigment.

At this time, it is important to prevent layer separation from occurring in order to uniformly mix the biodegradable resin composition, which is injected in a certain amount into the mixer. To prevent this, the mixer is a mixing body for uniformly mixing the biodegradable resin composition can be provided.

According to a preferred embodiment, the mixing body is detachably coupled to the inner lower part of the mixer, so that the biodegradable resin, the inorganic material, and the additives introduced from the upper part of the mixer into the inside do not gather at one point, but at multiple points By scattering and gathering, the biodegradable resin composition is to be uniformly mixed.

Specifically, the biodegradable resin, the inorganic material, and the additive introduced into the mixer are uniformly radiated around the mixing body by the repulsive force generated by bumping into the surface of the mixing body, and the biodegradable The resin, the inorganic material, and the additive may be uniformly mixed.

At this time, it is preferable that the mixing body is formed in a conical shape to increase uniformity among the biodegradable resin, the inorganic material, and the additives, but the shape of the mixing body may be cylindrical or spherical, but is not limited thereto.

In addition, by further providing one or more protrusions on the outer surface of the mixing body, the contact area with the surface of the mixing body is further improved to further improve the uniformity of the biodegradable resin, the inorganic material, and the additive to be mixed. .

Therefore, when mixing the biodegradable resin composition, layer separation between the biodegradable resin compositions is prevented from occurring, so that function degradation due to insufficient content is prevented from occurring.

Figure 2 is a flow chart showing a method of manufacturing a biodegradable fresh food storage bag according to the present invention.

Referring to Figure 2, in order to prepare a biodegradable fresh food storage bag using the biodegradable resin composition prepared by uniformly mixing, in the pellet manufacturing step (S40), the biodegradable resin composition is made into pellets through an extruder. After manufacturing, in the biodegradable resin film manufacturing step (S50), the film is put into a film forming machine to be manufactured into a biodegradable resin film.

According to a preferred embodiment, the extruder is operated in an environment of 90 ° C to 200 ° C, and when the temperature of the extruder exceeds 200 ° C, the bond of the biodegradable resin composition may be broken, resulting in a decrease in physical properties, so the temperature of the extruder to keep at a certain level.

In addition, the extruder is provided with a die plate having 21 holes, and the most appropriate pressure is applied to the biodegradable resin composition discharged in a stand manner through the extruder, so that the pellets are uniformly discharged and the quality is constant. ) can be produced.

The biodegradable resin film is intended to be manufactured as a packaging material for food, and the thickness of the biodegradable resin film is made of 0.03 μm to 0.05 μm, and it is preferable to selectively apply and use according to the target.

That is, when the thickness of the biodegradable resin film is made of less than 0.03 μm, the thickness is too thin, and when used as a packaging material, there is a risk that the internal product may be discharged out of the packaging material in the process of moving, and if the thickness exceeds 0.05 μm, the thickness It is too thick, so the oxygen permeability is low, which causes condensation.

The biodegradable resin film manufactured by the above method can be molded into a biodegradable fresh food storage bag in the biodegradable fresh food storage bag manufacturing step (S60), and the biodegradable fresh food storage bag has an oxygen permeability rate in the bag. It increases the lifespan of food and maintains freshness by adsorbing ethylene gas generated from food and lowering the ethylene gas concentration in the bag.

Hereinafter, the configuration and operation of the present invention through a preferred embodiment of the present invention will be described in more detail. However, the following examples are provided to aid understanding of the present invention, and the scope of the present invention is not limited to the following examples. Contents not described herein can be technically inferred by those skilled in the art, so descriptions thereof will be omitted.

Example 1

87 kg of biodegradable resin, polybutylene adipate perephthalate (PBAT), 6.5 kg of polylactic acid (PLA), and 6.5 kg of polybutylene succinate (PBS), are added to the mixer and mixed, and then, for 100 kg of biodegradable resin, While adding and mixing 3 kg of Illite, an inorganic substance, 0.10 kg of ADK STAB A0-60 from ADEKA as a primary antioxidant as an additive, 0.15 kg of ADK STAB 2112 from ADEKA as a secondary antioxidant, and 0.3 ethylene bis stamide (EBS) as a dispersant kg, 0.8 kg of dimethyl silicone oil and 0.5 kg of pigment as lubricating oil are added in small amounts and mixed sufficiently at high speed for 30 seconds and low speed for 4 minutes, and then, using an extruder with a screw at 90 ° C to 200 ° C, a rotational speed of 200 rpm to 500 rpm Pellets were prepared by extruding the biodegradable resin.

Next, the obtained pellets were vacuum-dried and prepared into a biodegradable resin film of 0.03 μm to 0.05 μm using a film forming machine.

Example 2

87 kg of biodegradable resin, polybutylene adipate perephthalate (PBAT), 6.5 kg of polylactic acid (PLA), and 6.5 kg of polybutylene succinate (PBS), are added to the mixer and mixed, and then, for 100 kg of biodegradable resin, While adding and mixing 7 kg of inorganic zeolite, 0.10 kg of ADK STAB A0-60 from ADEKA as a primary antioxidant as an additive, 0.15 kg of ADK STAB 2112 from ADEKA as a secondary antioxidant, and 0.3 kg of ethylene bis stamide (EBS) as a dispersant , 0.8 kg of dimethyl silicone oil and 0.5 kg of pigment were added in small amounts as lubricating oil, mixed sufficiently at high speed for 30 seconds and low speed for 4 minutes, and then at a rotational speed of 200 rpm to 500 rpm using an extruder having a screw at 90 ° C to 200 ° C. Pellets were prepared by extruding the biodegradable resin.

Next, the obtained pellets were vacuum-dried and prepared into a biodegradable resin film of 0.03 μm to 0.05 μm using a film forming machine.

Example 3

87 kg of biodegradable resin, polybutylene adipate perephthalate (PBAT), 6.5 kg of polylactic acid (PLA), and 6.5 kg of polybutylene succinate (PBS), are added to the mixer and mixed, and then, for 100 kg of biodegradable resin, While adding and mixing 7 kg of inorganic porous silica, 0.10 kg of ADEKA's ADK STAB A0-60 as a primary antioxidant, 0.15 kg of ADEKA's ADK STAB 2112 as a secondary antioxidant, and 0.3 ethylene bis stamide (EBS) as a dispersant. kg, 0.8 kg of dimethyl silicone oil and 0.5 kg of pigment as lubricating oil are added in small amounts and mixed sufficiently at high speed for 30 seconds and low speed for 4 minutes, and then, using an extruder with a screw at 90 ° C to 200 ° C, a rotational speed of 200 rpm to 500 rpm Pellets were prepared by extruding the biodegradable resin.

Next, the obtained pellets were vacuum-dried and prepared into a biodegradable resin film of 0.03 μm to 0.05 μm using a film forming machine.

Comparative Example 1

In Comparative Example 1, a biodegradable resin film for making a biodegradable fresh food storage bag was prepared in the same process as Example 1, but a biodegradable resin composition was prepared by adding 1 kg of illite, an inorganic material.

Comparative Example 2

In Comparative Example 2, a biodegradable resin film for making a biodegradable fresh food storage bag was prepared in the same process as in Example 1, but a biodegradable resin composition was prepared by adding 6 kg of illite, an inorganic material.

Comparative Example 3

In Comparative Example 3, a biodegradable resin film for making a biodegradable fresh food storage bag was prepared in the same process as in Example 2, but a biodegradable resin composition was prepared by adding 3 kg of inorganic zeolite.

Comparative Example 4

In Comparative Example 4, a biodegradable resin film for making a biodegradable fresh food storage bag was prepared in the same process as in Example 2, but a biodegradable resin composition was prepared by adding 9 kg of inorganic zeolite.

Comparative Example 5

In Comparative Example 5, a biodegradable resin film for making a biodegradable fresh food storage bag was prepared in the same process as in Example 3, but a biodegradable resin composition was prepared by adding 3 kg of inorganic porous silica.

Comparative Example 6

In Comparative Example 6, a biodegradable resin film for making a biodegradable fresh food storage bag was prepared in the same process as Example 3, but a biodegradable resin composition was prepared by adding 9 kg of inorganic porous silica.

Experimental Example 1

Experimental Example 1 is an experiment for confirming the mechanical properties of the biodegradable resin films prepared by Example 1 and Comparative Examples 1 and 2, and the results are shown in Table 1.

division Example 1 Comparative Example 1 Comparative Example 2 melt index
(MI, g/10min) 6.2 6.3 6.4 Tensile strength (TS, Mpa) 21.9 20.4 21.3 Tensile Elongation (TE, %) NOT BREAK 511 534 Flexural strength (FS, Mpa) 9.3 8.8 9.1 Flexural modulus (FM, %) 193 185 190 impact strength 577 569 575 density 1.2482 1.2531 1.2498 Hardness 44 43 44

As can be seen in Table 1, the biodegradable resin film (Example 1) prepared by adding 3 kg of illite to the mixed biodegradable resin composition has excellent mechanical strength and tensile elongation compared to the films of Comparative Examples 1 and 2. It can be confirmed that it exhibits physical properties, and in particular, Example 1 was confirmed to have the most excellent tensile elongation as the material did not break during the wavelength test for measuring the tensile elongation.

Experimental Example 2

Experimental Example 2 is an experiment to confirm the mechanical properties of the biodegradable resin film prepared by Example 2 and Comparative Examples 3 to 4, and the results are shown in Table 2.

division Example 2 Comparative Example 3 Comparative Example 4 melt index
(MI, g/10min) 6.4 6.5 6.7 Tensile strength (TS, Mpa) 21.3 19.7 20.8 Tensile Elongation (TE, %) 526 498 513 Flexural strength (FS, Mpa) 9.7 9.1 9.5 Flexural modulus (FM, %) 197 190 195 impact strength 588 579 582 density 1.2529 1.2599 1.2534 Hardness 45 44 45

As can be seen in Table 2, it can be seen that the biodegradable resin film (Example 2) prepared by adding 7 kg of zeolite to the mixed biodegradable resin composition exhibits excellent mechanical properties overall compared to the films of Comparative Examples 3 to 4. there is.

Experimental Example 3

Experimental Example 3 is an experiment to confirm the mechanical properties of the biodegradable resin films prepared by Example 3 and Comparative Examples 5 to 6, and the results are shown in Table 3.

division Example 3 Comparative Example 5 Comparative Example 6 melt index
(MI, g/10min) 12.4 12.5 12.8 Tensile strength (TS, Mpa) 18.9 16.4 17.6 Tensile Elongation (TE, %) NOT BREAK 454 468 Flexural strength (FS, Mpa) 8.6 8.2 8.5 Flexural modulus (FM, %) 185 179 183 impact strength 535 528 531 density 1.2536 1.3052 1.2864 Hardness 45 44 45

As can be seen in Table 3, it can be confirmed that the biodegradable resin film (Example 3) prepared by adding 7 kg of porous silica to the mixed biodegradable resin composition exhibits excellent mechanical properties overall compared to the films of Comparative Examples 5 to 6. can

In particular, as can be seen in Tables 1 to 3, among Examples 1 to 3, the biodegradable resin film prepared with the biodegradable resin composition mixed by adding 3 kg of illite has the highest tensile strength, and the tensile elongation is also NOT BREAK. During the test, it corresponds to the case where the wavelength does not break, which means that the material does not break, and it was confirmed that the mechanical properties (tensile strength, tensile elongation) of Example 1 were the most excellent.

Experimental Example 4

Experimental Example 4 is an experiment to confirm the oxygen permeability of the biodegradable resin films prepared by Examples 1 to 3 and Comparative Examples 1 to 6, and the results are shown in Table 4.

division Oxygen permeability (m1/m2 day atm) Example 1 3400 Example 2 3200 Example 3 3000 Comparative Example 1 3100 Comparative Example 2 3300 Comparative Example 3 2800 Comparative Example 4 3100 Comparative Example 5 2400 Comparative Example 6 2900

As can be seen in Table 4, it was confirmed that the oxygen permeability of Examples 1 to 3 was high, and in particular, the oxygen permeability of the biodegradable resin film (Example 1) made of a biodegradable resin composition in which illite was mixed with an inorganic confirmed to be high.

However, it can be seen that Comparative Example 1, which has a relatively low content of illite, has slightly lower oxygen permeability than Example 2, and the oxygen permeability of Comparative Examples 5 to 6, which have a different content of porous silica than Examples 1 to 3, was found to be rather low.

Preferably, it is preferable to manufacture a biodegradable fresh food storage bag with the biodegradable resin film prepared in Example 1 having the highest tensile strength, tensile elongation and oxygen permeability, but the biodegradable plastic film prepared in Examples 2 to 3 A biodegradable fresh food storage bag molded with a resin film is also confirmed to have high tensile strength, tensile elongation and oxygen permeability. It may be made of a film.

Therefore, the biodegradable fresh food storage bag molded from the biodegradable resin film prepared in Examples 1 to 3 has excellent tensile strength, tensile elongation and oxygen permeability, so that almost no damage occurs during the transport of fresh food. It has the effect of keeping it fresher.

In addition, the biodegradable fresh food storage bag is manufactured by using a biodegradable resin composition in which an inorganic substance capable of adsorbing ethylene gas is mixed, thereby adsorbing gas generated from food in the bag and improving oxygen permeability to extend the life of the food has the effect of

Although the embodiments of the present invention have been described with reference to the above and the accompanying drawings, those skilled in the art to which the present invention pertains can implement the present invention in other specific forms without changing the technical spirit or essential features. You will understand that there is Therefore, it should be understood that the embodiments described above are illustrative in all respects and not restrictive.

S10: biodegradable resin mixing step
S20: Inorganic addition step
S30: additive addition step
S40: pellet manufacturing step
S50: biodegradable resin film manufacturing step
S60: Biodegradable fresh food storage bag manufacturing step

Claims (7)

With respect to 100 parts by weight of the biodegradable resin,
2 to 8 parts by weight of an inorganic substance;
0.05 to 0.15 parts by weight of a primary antioxidant;
0.1 to 0.2 parts by weight of a secondary antioxidant;
0.2 to 0.4 parts by weight of a dispersant;
0.6 to 1 part by weight of a lubricant; and
0.3 to 0.7 parts by weight of a pigment; Including,
The biodegradable resin is
80 to 90% by weight of polybutylene adipate perephthalate (PBAT);
5 to 10% by weight of polylactic acid (PLA);
Biodegradable resin characterized in that it has high toughness and high temperature resistance as it contains 80 to 90% by weight of the polybutylene adipate perephthalate (PBAT), including 5 to 10% by weight of polybutylene succinate (PBS) composition. delete According to claim 1,
The inorganic material is a biodegradable resin composition, characterized in that it comprises at least one selected from the group consisting of illite, zeolite, porous silica. 80 to 90% by weight of a biodegradable resin, polybutylene adipate perephthalate (PBAT), 5 to 10% by weight of polylactic acid (PLA), and 5 to 10% by weight of polybutylene succinate (PBS) are added to a mixer and mixed. Biodegradable resin mixing step to do;
An inorganic material addition step of adding 2 to 8 parts by weight of an inorganic material to the biodegradable resin introduced into the mixer;
0.05 to 0.15 parts by weight of a primary antioxidant, 0.1 to 0.2 parts by weight of a secondary antioxidant, 0.2 to 0.4 parts by weight of a dispersant, 0.6 to 1 part by weight of a lubricant, and 0.3 to 0.7 parts by weight of a pigment as additives to the biodegradable resin composition in which the inorganic substance is mixed. Including; adding additives in small portions by weight;
the mixer,
In order to uniformly mix the biodegradable resin composition, by including a mixing body detachably coupled to the inner lower part of the mixer so that the components of the biodegradable resin composition introduced into the mixer are scattered and gathered again at multiple points To prevent the problem of lack of content due to layer separation between biodegradable resin compositions,
The primary antioxidant stabilizes the polymer by preventing a chain reaction of radicals, and the secondary antioxidant decomposes the peroxide to stabilize the polymer by removing oxygen atoms of the polymer that has already been oxidized. prevent,
A method for producing a biodegradable resin composition, characterized in that it has high toughness and high temperature resistance as the polybutylene adipate perephthalate (PBAT) is contained in an amount of 80 to 90% by weight. delete A biodegradable resin characterized in that it is made into a biodegradable resin film by introducing pellets prepared through an extruder, including the biodegradable resin composition according to any one of claims 1 and 3, into a film forming machine. composition. delete

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