KR102450040B1 - Manufacturing method of food packaging container with graphene - Google Patents

Abstract

The present invention relates to a manufacturing method of a food packaging container containing graphene, which comprises: a raw material preparation step (A) of composing and blending 0.01 to 10 parts by weight of graphene raw material based on 100 parts by weight of polyethylene (PE); a pellet processing step (B) of processing a polyethylene (PE) pellet containing graphene by introducing the polyethylene (PE) and graphene raw material mixture prepared in the step (A) into an extruder, melt-extruding, cooling, and then cutting the same into a certain size; a filling step (C) of melting the polyethylene (PE) pellet containing graphene, which is the result product of the step (B), by using a heating cylinder and then, injecting the same into a mold; a packing step (D) of applying a certain pressure to compensate for a space in which the volume shrinks as the melt product injected into the mold in the step (C) is cooled; a molding and cooling step (E) of molding the melt product into a food packaging container having a certain shape and solidifying the same for a certain time in the mold; and a take-out step (F) of separating the food packaging container, which has been molded and cooled through the step (E), from the mold. In the step (A), at least one of graphene, graphene oxide (GO), and reduced graphene oxide (rGO) is used as the graphene raw material. According to the present invention, the food packaging container containing graphene and additionally having an antibacterial function and the like can be manufactured, and the food packaging container containing graphene and capable of exhibiting improved strength can be manufactured.

Description

Manufacturing method of food packaging container containing graphene {MANUFACTURING METHOD OF FOOD PACKAGING CONTAINER WITH GRAPHENE}

The present invention relates to a method for manufacturing a food packaging container containing graphene, and more particularly, by grafting graphene to a food packaging container, it provides a function of blocking light transmission, thereby extending the shelf life of food, In addition, it relates to a method for manufacturing a food packaging container containing graphene so as to have an increase in strength and an antibacterial function.

In the packaging industry, packaging containers are used for the purpose of protecting contents safely by preventing loss, contamination, and deformation of contents in natural environments such as temperature, humidity, light, and microorganisms when manufacturing, transporting, and storing contents.

In the past, packaging containers for storing cosmetics, food, beverages, medicines, etc. were manufactured using glass, wood, paper, ocher or metal as materials, but recently, portability, airtightness, preservation, stability, convenience, etc. The use and usability of packaging containers are changing as a product that places importance on packaging, and they are being replaced by plastic containers to secure price competitiveness.

However, unlike containers made of glass or metal, plastic containers are permeable, so the contents are easily changed, and contamination by microorganisms can be easily induced. Although chemical materials are added together, various studies on how to impart antibacterial properties to the packaging container itself as part of an effort to remove or reduce preservatives and preservatives as the harmfulness of preservatives or preservatives rises and consumer anxiety increases. is in progress

Accordingly, in order to compensate for the disadvantages of the plastic container, it is possible to more effectively maintain freshness by blocking light permeability, and to preserve the shape and quality of food during storage, storage and transportation, such as high mechanical strength and antibacterial properties. There is a demand for development of functional food packaging containers that can implement functionality.

Therefore, in order to solve the above problems, the present invention provides a food packaging container containing graphene that can block the transmission of light by manufacturing a food packaging container containing graphene to extend the shelf life of the food contained therein. To provide a manufacturing method.

An object of the present invention is to provide a method for manufacturing a food packaging container containing graphene, which can additionally improve strength and provide effective functions for food such as antibacterial function.

The method for manufacturing a food packaging container containing graphene of the present invention for achieving the above object is (A) preparing raw materials for composition and blending 0.01 parts by weight to 10 parts by weight of a graphene raw material based on 100 parts by weight of polyethylene (PE) step; (B) Pellet processing in which the polyethylene (PE) and graphene raw material blend prepared in step (A) is put into an extruder, melt-extruded, cooled, and then cut to a predetermined size to process polyethylene (PE) pellets containing graphene step; (C) a filling step of melting the polyethylene pellets containing graphene, which is the result of step (B), using a heating cylinder, and then injecting it into a mold; (D) a holding pressure step of applying a constant pressure to compensate for the space in which the volume is contracted while the melt injected into the mold in step (C) is cooled; (E) forming and cooling the melt in the mold into a food packaging container having a predetermined shape and solidifying for a predetermined time; (F) taking out step of separating the food packaging container that has been molded and cooled through the step (E) from the mold; , it is characterized in that at least one of reduced graphene oxide (rGO) is used.

In addition, below will be described more various embodiments of the method for manufacturing a food packaging container containing graphene in the present invention.

As described above, the present invention can increase the shelf life of food by blocking light transmission through a method for manufacturing a food packaging container containing graphene, and through this, a graphene-containing food packaging container that can safely store food for a long period of time can be manufactured.

According to the present invention, it is possible to additionally manufacture a food packaging container containing graphene having an antibacterial function and the like, and a food packaging container containing graphene capable of exhibiting improved strength.

1 is a manufacturing process diagram illustrating a method for manufacturing a food packaging container containing graphene according to an embodiment of the present invention.

The present invention provides a method for manufacturing a food packaging container containing graphene.

Hereinafter, a method for manufacturing a food packaging container containing graphene according to an embodiment of the present invention will be described with reference to the drawings.

As shown in FIG. 1, the method for manufacturing a food packaging container containing graphene of the present invention includes a raw material preparation step, a pellet processing step, a filling step, a holding pressure step, a molding and cooling step, and an extraction step.

In addition, it may further include an antibacterial coating step if necessary.

In the raw material preparation step, 0.01 to 10 parts by weight of the graphene raw material is formulated and blended based on 100 parts by weight of polyethylene (PE).

In the raw material preparation step, polyethylene (PE) is used at least one of high-density polyethylene (HDPE), low-density polyethylene (LDPE), and linear low-density polyethylene (LLDPE).

At this time, when the low-density polyethylene (LDPE) and linear low-density polyethylene (LLDPE) are blended, low-density polyethylene (LDPE) for flexibility, processability and chemical resistance: LDPE-side linear for maintaining physical properties at high temperatures and imparting tensile strength Low-density polyethylene (LLDPE) = 1-1.5: It can be used by mixing in a weight ratio or volume ratio of 0.5-1.2.

The low-density polyethylene (LDPE) and linear low-density polyethylene (LLDPE) have large cold resistance, chemical resistance and excellent strength, and are often used in frozen food packaging because they have insulation, and have good transparency and flexibility, so films for flexible packaging or flexible containers Or it is mainly used for cartons, etc.

The low-density polyethylene (LDPE) preferably has a density of 0.910 to 0.925 g/cm 3 . It has excellent elasticity and is characterized by easy processing. It is also waterproof and has excellent thermal insulation.

The linear low-density polyethylene (LLDPE) has properties similar to those of low-density polyethylene (LDPE), but has excellent rigidity. Compared to low-density polyethylene (LDPE), excellent physical properties can be realized at a thin thickness. It has good strength and excellent heat resistance.

The graphene raw material may be one or more of graphene, graphene oxide (GO), and reduced graphene oxide (rGO).

In addition, carbon nanotubes (CNTs) may be included.

Through the graphene raw material, it is possible to increase the preservation power such as preventing spoilage or deterioration of the inherent food by providing excellent physical and chemical stability to the food packaging material made of polyethylene as the main material, and blocking the transmission of light. It can be manufactured as a durable food packaging material by increasing its strength and torsion characteristics while maintaining elasticity.

Here, the graphene may be prepared by the following manufacturing process.

(1) 20-30 mg/ml of graphene oxide powder is added to deionized water to obtain a first aqueous solution.

(2) Add 5-10 mg/ml of mineral powder of germanium, illite, or zeolite to deionized water to obtain a second aqueous solution.

The mineral powder of germanium, illite, or zeolite can be included in the produced graphene powder to increase antibacterial properties and prevent spoilage or deterioration of food through far-infrared or anion radiation, thereby extending the shelf life.

(3) A solvent is obtained by stirring monobasic sodium phosphate and choline chloride in a weight ratio of 1:1 at 50 to 60°C.

(4) Based on 100 parts by weight of the first aqueous solution, 30 to 80 parts by weight of the second aqueous solution and 200 to 250 parts by weight of a solvent are mixed and stirred at 50 to 60° C. to obtain a graphene mixture.

(5) Wash the graphene mixture using deionized water, but wash 3 times or more through a centrifuge to obtain a graphene solution.

(6) The graphene solution is freeze-dried and then pulverized to prepare graphene powder.

Here, the graphene oxide (GO) may be prepared by the following manufacturing process.

(1) 50-100 mL of 90-98 wt% sulfuric acid, 1-2 g of sodium nitrate, and 1.5-3 g of graphite are placed in a reactor and stirred for 40 to 60 minutes while maintaining the temperature below 0°C.

(2) Add 10-15 g of potassium permanganate and stir for 30-40 minutes.

(3) Add 250~300mL of distilled water and 8~12mL of hydrogen peroxide, and stir for 30~40 minutes.

(4) Repeating and washing with water and centrifugation several times with 5-8% hydrochloric acid and deionized water to neutralize to pH 6-7 to obtain a graphene oxide solution.

(5) The graphene oxide solution is freeze-dried and then pulverized to prepare a graphene oxide (GO) powder.

Here, the reduced graphene oxide (rGO) may be prepared by the following manufacturing process.

(1) Prepare a gelatin solution by putting 5-10 g of gelatin powder in a stirrer together with 100-120 mL of aqueous solution and stirring at 50-60° C. for 40-60 minutes to dissolve.

Through the gelatin powder, it is possible to prevent contamination by bacterial toxins or mycotoxins on the side of the food packaging material to be manufactured, and to protect food because of its elasticity and water retention properties.

(2) By adding graphene oxide (GO) powder to 150-200 mL aqueous solution, a concentration of 0.1-0.5 g/mL graphene oxide (GO) aqueous solution is prepared.

In this case, the graphene oxide (GO) powder may be graphene oxide prepared by the manufacturing process described above.

(3) A gelatin-containing graphene oxide (GO) suspension is obtained by adding a gelatin solution to the graphene oxide (GO) aqueous solution at a temperature of 80 to 95° C. and stirring it.

(4) The gelatin-containing graphene oxide (GO) suspension is centrifuged at 20,000 ppm and washed with water at 100° C. or higher to obtain a gelatin-containing reduced graphene oxide (rGO) solution.

(5) A reduced graphene oxide (rGO) powder is prepared by freeze-drying and pulverizing a gelatin-containing reduced graphene oxide (rGO) solution.

In addition, in the raw material preparation step, for antibacterial properties, cinnamon, chamomile, citronella, centella asiatica, peppermint, eoseongcho, eugeunpi, yeonkyo, chungjang, earth worm, hawthorn, yellow lily, gold, bergamot, chitosan, wasabi, mustard seed, coffee One or more of the extracts may be further added.

At this time, the extract may be formulated in an amount of 0.5 to 20 parts by weight based on 100 parts by weight of polyethylene (PE), and the extract may be an extract or an extract powder.

Here, the extract is obtained by pulverizing the raw material, immersing 200-300 g of the raw material powder in 2-3 L of 80-90% concentration of ethyl alcohol and maintaining the extract at a temperature of 50-60 ℃ for 12-24 hours to extract the extract , The extract thus extracted may be put into a vacuum concentrator and concentrated under reduced pressure at a temperature of 40 to 50° C., and the extract obtained by filtering the concentrated extract under reduced pressure using a filter may be an extract.

Here, the extract powder may be an extract powder obtained by freeze-drying and pulverizing the extract extracted by the above-described process at -40 to -60 ° C and 100 to 120 mm Torr pressure for 20 to 24 hours.

In addition, the extract is cinnamon, chamomile, citronella, centella asiatica, peppermint, eoseongcho, eugeunpi, Yeongyo, creation, earth jasmine, hawthorn, hwangryeon, gold, bergamot, chitosan, wasabi, mustard seed, any one kind of raw material from coffee Put 5-10 kg in 10-20 mL of 75% ethanol and repeat the extraction process with stirring at 80-120 rpm for 10-20 hours at room temperature (20-30°C) twice, and the obtained extract is filtered through 1 After primary filtration, it may be filtered and concentrated under reduced pressure using a rotary evaporator in a water bath at 50 to 60° C., followed by secondary filtration through a membrane filter.

Then, the extract powder thus extracted can be obtained by freeze-drying at -40 to -60°C and 100 to 120 mm Torr pressure for 20 to 24 hours and then pulverizing it.

In addition, in the raw material preparation step, it may have a configuration in which a mixture of a mineral powder and an extract is added for effective functionality in food, such as antibacterial and anion release.

At this time, the mineral powder: extract = 0.3 to 1: can be formulated in a weight ratio of 0.5 to 1.5.

Here, the mixture may be blended in an amount of 0.5 to 20 parts by weight based on 100 parts by weight of polyethylene (PE).

The mineral powder may be any one of germanium, illite, zeolite, volcanic stone, and diatomaceous earth.

Here, the mineral powder may be one coated with vegetable oil to increase mixing efficiency and dispersibility with the extract, and the vegetable oil is selected from among grape seed oil, sunflower seed oil, olive oil, rapeseed oil, and camellia oil. It can be any one day.

Through the mineral powder, it is possible to maintain food preservation and freshness through the emission of far-infrared rays and negative ions, as well as improve durability such as strength increase.

The extract is an extract by any one of cinnamon, chamomile, citronella, centella asiatica, peppermint, eoseongcho, eugeunpi, Yeongyo, creation, earthworm, hawthorn, yellow lily, gold, bergamot, chitosan, wasabi, mustard seed, coffee can

Here, the extract may be an extract or an extract powder, which has already been prepared by the above-described manufacturing process, and it will be applied mutatis mutandis.

In the pellet processing step, the polyethylene (PE) and graphene raw material blend prepared in the raw material preparation step is put into an extruder, melt-extruded, cooled, and then cut to a predetermined size to process polyethylene (PE) pellets containing graphene.

In the pellet processing step, it can be processed in the form of pellets of about 2 mm to 5 mm.

Here, the pellet processing step may be performed under the conditions of maintaining a temperature of 260° C. to 300° C., and controlling the extrusion rate to 7 kg/hr to 15 kg/hr.

In the filling step, the graphene-containing polyethylene pellets processed in the pellet processing step are melted using a heating cylinder, and then the melt is injected into the mold.

Here, the heating cylinder may be adjusted to 200° C. to 280° C. for melt processing of graphene-containing polyethylene pellets.

In the holding pressure step, a constant pressure is applied to compensate for a space in which the volume is contracted while the melt injected into the mold is cooled in the filling step.

At this time, a constant pressure is applied to the nozzle to continuously inject the melt.

In the forming and cooling step, the melt is molded into a food packaging container having a predetermined shape and solidified for a predetermined time in the mold.

In the taking out step, the molded and cooled food packaging container is separated from the mold and taken out.

In addition, the antibacterial coating step, which may be further included as needed, is a step of forming an antibacterial coating layer by coating the inner surface of a food packaging container containing graphene prepared by completing the extraction step.

The antibacterial coating layer may be made of a combination of 10 to 50 parts by weight of vegetable oil and 1 to 30 parts by weight of mineral powder based on 100 parts by weight of the antibacterial extract.

Here, the antibacterial extract is cinnamon, chamomile, citronella, centella asiatica, peppermint, eoseongcho, eugeunpi, yeonkyo, creation, earth jasmine, hawthorn, hwangryeon, gold, bergamot, chitosan, wasabi, mustard seed, among the extracts by coffee There may be more than one type.

The antibacterial extract is more preferably an extract, and is provided in the same way as the extract prepared by the above-described manufacturing process, and the above contents will be applied mutatis mutandis.

Here, the vegetable oil may be one selected from grape seed oil, sunflower seed oil, olive oil, rapeseed oil, and camellia oil.

Here, the mineral powder may be one selected from germanium, illite, zeolite, volcanic stone, and diatomaceous earth.

The mineral powder may have increased functionality, such as far-infrared rays or anion emission, through heat treatment of heating at a temperature of 300° C. to 450° C. in the mineral material itself or in a powder state.

Hereinafter, the present invention will be described in more detail through examples, and the present invention is not limited by these examples.

(Example 1)

Synthesis of graphene oxide (GO)

As a raw material for graphene oxide (GO), natural graphite powder (Alfa aesar) having a particle size of 100 mesh and a purity of 99.9995% was used. Other organic solvents were used as they were without further purification.

70 mL of 98wt% sulfuric acid, 1.5 g of sodium nitrate, and 2 g of graphite were placed in a reaction tank and stirred uniformly while maintaining the reaction tank at 0° C. or less, and then 12 g of potassium permanganate was slowly added and stirred for 30 minutes.

Thereafter, after sufficiently further stirring at room temperature, 280 mL of distilled water and 10 mL of hydrogen peroxide were added to react. The reaction solution was washed repeatedly with water and centrifugation several times with 5% hydrochloric acid and deionized water, neutralized to PH6-7, and then freeze-dried to obtain graphene oxide (GO) powder.

(Example 2)

Synthesis of reduced graphene oxide (rGO) using gelatin

For gelatin (Sigma Aldrich), gelatin powder was used. Other solvents were used as they were without further purification.

A gelatin solution was prepared by putting 5 g of gelatin in a stirrer together with 100 mL of aqueous solution and stirring at 50° C. for 1 hour to completely dissolve the gelatin. Then, graphene oxide (GO) powder was added to the 200 mL aqueous solution to prepare a 0.1 g/mL GO aqueous solution. Thereafter, the prepared GO solution was reacted by dropping the gelatin solution at 90° C. and stirring. The resulting suspension was centrifuged at 20,000 ppm and washed with hot water at 100° C. or higher to obtain reduced graphene oxide (rGO) powder using gelatin.

(Example 3)

Preparation of extracts for antibacterial properties

It is possible to select and extract any one or more of plants by Eoseongcho, Yugeunpi, Yeongyo, pine needles, green tea, Chrysanthemum, Jijija, Sansa, and Hwangryeon.

The process of extracting with stirring for 12 hours at 80 rpm at room temperature into 10 mL of 75% ethanol 10 kg of yellow lily was repeated twice.

After primary filtration of the extract obtained twice, filtration and concentration under reduced pressure using a rotary evaporator in a water bath at 50° C., and secondary filtration through a membrane filter to obtain an extract.

The extract obtained in this way was freeze-dried at -40°C and 100 mmTorr pressure for 24 hours, then crushed and powdered to obtain an extract powder.

(Example 4)

Preparation of reduced graphene oxide (rGO)-containing PE pellets using gelatin

100 g of the reduced graphene oxide (rGO) powder using the gelatin obtained in Example 2 was put in a mixer with 100 kg of linear low-density polyethylene (LLDPE), stirred at 150 ° C., and then put into an extruder, melted and mixed to form a composition Then, the graphene-containing pellets were prepared by cutting and drying in the form of pellets with a diameter of 3 mm or less.

In the extruder, a temperature of 280° C. was maintained, and the extrusion rate was adjusted to 10 kg/hr.

(Example 5)

Manufacture of food packaging containers using graphene-containing PE pellets

The PE pellets containing graphene obtained in Example 4 were prepared in a packaging container having a predetermined shape using an injection mold facility.

(Comparative Example 1)

Manufacture of food packaging containers using normal (non-graphene pellets) PE

High-density polyethylene (HDPE) without graphene was used, and a packaging container was manufactured using an injection mold facility. Such a food packaging container was used as a control.

(Test Example 1)

Analysis of physical properties of food packaging containers containing graphene

UV-Vis Spectroscopy was used to measure the light blocking rate. Oxygen permeability was measured using Illinois Instrument 8001 Model at a relative humidity of 30% and a temperature of 25°C. Water permeability was measured using MOCON.

The results are shown in Table 1 below.

Food packaging container of the present invention Control food packaging light blocking rate
(300nm~400nm) 94% 69% Light blocking rate (400nm~500nm) 85% 60% Light blocking rate (500nm~600nm) 76% 47% Oxygen permeability (cc/m 2 day, at 25RH30) 0.1 1.2 Water permeability (cc/m 2 day) 0.15 2.88

According to Table 1, the food packaging container containing graphene of the present invention showed a higher light blocking rate in the wavelength region of 300 nm to 600 nm compared to the control food packaging container. In addition, the oxygen permeability of the food packaging container of the present invention is 0.1cc/m 2day (25°C, relative humidity 30%), which is significantly lower than that of the control food packaging container 1.2cc/m 2day (25°C, relative humidity 30%). , the water permeability of the food packaging container of the present invention was 0.15 cc/m 2day, which was lower than that of the control food packaging container of 2.88 cc/m 2day. It was 70% or more, and it was confirmed that the oxygen permeability and water permeability showed improved results compared to the general packaging container without any treatment.

(Test Example 2)

Antimicrobial evaluation analysis of food packaging containers containing graphene

In order to measure the antibacterial activity of the graphene-containing food packaging container of the present invention to which the antibacterial extract was added, the suspension method was used.

The three strains of the experiment (L.monocytogenes, S.aureus, E.coli) were collected from the logarithmic growth phase and inoculated into a food packaging container containing graphene containing an antibacterial extract, and left for 24 hours at an interval of 8 hours. The absorbance was measured to determine the antibacterial activity of the container.

The results are shown in Table 2 below.

strain hour 8 hours 16 hours 24 hours L. monocytogenes 6.0±0.0mm 7.0±0.1mm 7.2±0.1mm S. aureus 6.0±0.0mm 6.5±0.0mm 6.3±0.5mm E. coli 7.5±0.4mm 7.7±0.5mm 8.0±0.0mm

According to Table 2, after distributing three strains in a food packaging container containing graphene to which the antimicrobial extract of the present invention was added, the antimicrobial activity was measured after 8 hours, 16 hours and 24 hours. As a result, the L. monocytogenes strain was 8 6.0±0.0mm after 1 hour, 7.0±0.1mm after 16 hours, and 7.2±0.1mm after 24 hours, indicating that there is an antibacterial activity. Similarly, in S. aureus strains and E. coli strains, the activity does not change significantly after 8 hours, 16 hours, and 24 hours, indicating that there is an antibacterial activity. As such, in the present invention, graphene-containing As food packaging containers appear to have no lowering of antibacterial activity over time, substances that pose a problem of toxicity, such as chemical-added preservatives and preservatives, are used instead to store, store and transport food. It will be said that it can provide the advantage of effectively maintaining the freshness of food.

Accordingly, the present invention can increase the shelf life of food by blocking the transmission of light through the graphene containing, and through this, food can be safely stored for a long time, and additionally, through antibacterial function, etc., it is possible to prevent deterioration and freshness of food. Food packaging containers containing graphene that enable maintenance can be manufactured and supplied.

Claims (8)

(A) a raw material preparation step of composition and blending 0.01 parts by weight to 10 parts by weight of a graphene raw material based on 100 parts by weight of polyethylene (PE);
(B) Pellet processing in which the polyethylene (PE) and graphene raw material blend prepared in step (A) is put into an extruder, melt-extruded, cooled, and then cut to a predetermined size to process polyethylene (PE) pellets containing graphene step;
(C) a filling step of melting the polyethylene pellets containing graphene, which is the result of step (B), using a heating cylinder, and then injecting it into a mold;
(D) a holding pressure step of applying a constant pressure to compensate for the space in which the volume is contracted while the melt injected into the mold in step (C) is cooled;
(E) forming and cooling the melt in the mold into a food packaging container having a predetermined shape and solidifying for a predetermined time;
(F) a taking out step of separating the food packaging container that has been molded and cooled through the step (E) from the mold; includes,
In step (A), the graphene raw material is graphene,
The graphene is
(1) adding 20-30 mg/ml of graphene oxide powder to deionized water to obtain a first aqueous solution;
(2) adding 5 to 10 mg/ml of a mineral powder of germanium, illite, or zeolite to deionized water to obtain a second aqueous solution;
(3) obtaining a solvent by stirring monobasic sodium phosphate and choline chloride in a weight ratio of 1:1 at 50 to 60°C;
(4) mixing 30 to 80 parts by weight of the second aqueous solution and 200 to 250 parts by weight of a solvent based on 100 parts by weight of the first aqueous solution and stirring at 50 to 60° C. to obtain a graphene mixture;
(5) washing the graphene mixture using deionized water, but washing three or more times through a centrifugal separator to obtain a graphene solution;
(6) freeze-drying the graphene solution and then pulverizing to prepare a graphene powder; A method for manufacturing a food packaging container containing graphene, characterized in that manufactured by (A) a raw material preparation step of composition and blending 0.01 parts by weight to 10 parts by weight of a graphene raw material based on 100 parts by weight of polyethylene (PE);
(B) Pellet processing in which the polyethylene (PE) and graphene raw material blend prepared in step (A) is put into an extruder, melt-extruded, cooled, and then cut to a predetermined size to process polyethylene (PE) pellets containing graphene step;
(C) a filling step of melting the polyethylene pellets containing graphene, which is the result of step (B), using a heating cylinder, and then injecting it into a mold;
(D) a holding pressure step of applying a constant pressure to compensate for the space in which the volume is contracted while the melt injected into the mold in step (C) is cooled;
(E) forming and cooling the melt in the mold into a food packaging container having a predetermined shape and solidifying for a predetermined time;
(F) a taking out step of separating the food packaging container that has been molded and cooled through the step (E) from the mold; includes,
In the step (A), the graphene raw material is graphene oxide (GO),
The graphene oxide (GO) is,
(1) stirring for 40 to 60 minutes while maintaining 50 to 100 mL of 90-98 wt% sulfuric acid, 1 to 2 g of sodium nitrate, and 1.5 to 3 g of graphite in a reaction tank at 0° C. or less;
(2) adding 10 to 15 g of potassium permanganate and stirring for 30 to 40 minutes;
(3) further adding 250~300mL of distilled water and 8~12mL of hydrogen peroxide and stirring for 30~40 minutes;
(4) repeating and washing with water and centrifugation several times with 5-8% hydrochloric acid and deionized water to neutralize to pH 6-7 to obtain a graphene oxide solution;
(5) preparing a graphene oxide (GO) powder by freeze-drying the graphene oxide solution and then pulverizing the graphene oxide solution; A method for manufacturing a food packaging container containing graphene, characterized in that manufactured by (A) a raw material preparation step of composition and blending 0.01 parts by weight to 10 parts by weight of a graphene raw material based on 100 parts by weight of polyethylene (PE);
(B) Pellet processing in which the polyethylene (PE) and graphene raw material blend prepared in step (A) is put into an extruder, melt-extruded, cooled, and then cut to a predetermined size to process polyethylene (PE) pellets containing graphene step;
(C) a filling step of melting the polyethylene pellets containing graphene, which is the result of step (B), using a heating cylinder, and then injecting it into a mold;
(D) a holding pressure step of applying a constant pressure to compensate for the space in which the volume is contracted while the melt injected into the mold in step (C) is cooled;
(E) forming and cooling the melt in the mold into a food packaging container having a predetermined shape and solidifying for a predetermined time;
(F) a taking out step of separating the food packaging container that has been molded and cooled through the step (E) from the mold; includes,
In the step (A), the graphene raw material is reduced graphene oxide (rGO),
The reduced graphene oxide (rGO) is,
(1) preparing a gelatin solution by putting 5-10 g of gelatin powder in a stirrer together with 100-120 mL of aqueous solution and stirring at 50-60° C. for 40-60 minutes to dissolve;
(2) preparing an aqueous solution of graphene oxide (GO) having a concentration of 0.1 to 0.5 g/mL by adding graphene oxide (GO) powder to an aqueous solution of 150 to 200 mL;
(3) obtaining a gelatin-containing graphene oxide (GO) suspension by adding a gelatin solution to the graphene oxide (GO) aqueous solution at a temperature of 80 to 95° C. and stirring;
(4) centrifuging the gelatin-containing graphene oxide (GO) suspension at 20,000 ppm and washing with water at 100° C. or higher to obtain a gelatin-containing reduced graphene oxide (rGO) solution;
(5) preparing a reduced graphene oxide (rGO) powder by freeze-drying and then pulverizing the gelatin-containing reduced graphene oxide (rGO) solution; A method for manufacturing a food packaging container containing graphene, characterized in that manufactured by 4. The method according to any one of claims 1 to 3,
(G) an antibacterial coating step of forming an antibacterial coating layer by coating the inner surface of the food packaging container completed through the step (F); further comprising,
The antibacterial coating layer,
Based on 100 parts by weight of the antibacterial extract, it is composed of 10 to 50 parts by weight of vegetable oil and 1 to 30 parts by weight of mineral powder.
The antibacterial extract is at least one of cinnamon, chamomile, citronella, centella asiatica, peppermint, eoseongcho, eugeunpi, Yeongyo, creation, earth jasmine, hawthorn, hwangryeon, gold, bergamot, chitosan, wasabi, mustard seed, and coffee extracts ego,
The vegetable oil is one selected from grape seed oil, sunflower seed oil, olive oil, rapeseed oil, and camellia oil,
The method for manufacturing a food packaging container containing graphene, characterized in that the mineral powder is one selected from germanium, illite, zeolite, volcanic stone, and diatomaceous earth. 4. The method according to any one of claims 1 to 3,
In the raw material preparation step, polyethylene (PE) is
At least one of high-density polyethylene (HDPE), low-density polyethylene (LDPE), and linear low-density polyethylene (LLDPE) is used,
When blending the low-density polyethylene (LDPE) and linear low-density polyethylene (LLDPE), low-density polyethylene (LDPE) for flexibility, processability and chemical resistance: Linear low-density polyethylene (LDPE) for maintaining physical properties at high temperatures and imparting tensile strength ( LLDPE) = 1 to 1.5: A method for manufacturing a food packaging container containing graphene, characterized in that it is mixed in a weight ratio or volume ratio of 0.5 to 1.2. 4. The method according to any one of claims 1 to 3,
In the raw material preparation step,
For antibacterial properties, at least one of extracts from cinnamon, chamomile, citronella, centella asiatica, peppermint, eoseongcho, eugeunpi, yeonkyo, chrysanthemum, earth worm, hawthorn, yellow lily, gold, bergamot, chitosan, wasabi, mustard seed, and coffee add more,
The extract is blended in an amount of 0.5 to 20 parts by weight based on 100 parts by weight of polyethylene (PE),
The method for manufacturing a food packaging container containing graphene, characterized in that the extract is an extract or an extract powder. 4. The method according to any one of claims 1 to 3,
In the raw material preparation step,
A mineral powder of any one of germanium, illite, zeolite, volcanic stone, and diatomaceous earth,
A mixture of extracts from any one of cinnamon, chamomile, citronella, centella asiatica, peppermint, eoseongcho, eugeunpi, yeonkyo, creation, ginseng, sansa, yellow lily, gold, bergamot, chitosan, wasabi, mustard seed, and coffee add more,
The mineral powder: extract = 0.3 to 1: blended in a weight ratio of 0.5 to 1.5,
The method for manufacturing a food packaging container containing graphene, characterized in that the mixture is blended in an amount of 0.5 to 20 parts by weight based on 100 parts by weight of polyethylene (PE). delete

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