KR102455672B1 - Method for manufacturing food packaging material using pellet with graphene - Google Patents

Abstract

The present invention relates to a method for manufacturing a food packaging material using graphene-containing pellets, which comprises: a raw material preparation step (A) of composing and mixing 0.01 to 5 parts by weight of graphene raw material based on 100 parts by weight of polyethylene (PE); a pellet processing step (B) of putting the polyethylene (PE) and graphene raw material mixture prepared in the step (A) into an extruder, melting, extruding, cooling, and then cutting the same to a certain size so as to process graphene-containing polyethylene (PE) pellets; an extrusion molding step (C) of putting the graphene-containing polyethylene (PE) pellets processed in the step (B) into a film processing facility to extrude and mold a graphene-containing polyethylene (PE) film having a certain thickness; a printing step (D) of forming a printed layer on an outer surface of the graphene-containing polyethylene (PE) film extruded and molded in the step (C); a winding and cutting step (E) of winding the graphene-containing polyethylene (PE) film on which the printing layer is formed in the step (D) according to a certain speed and then, cutting the same to a required size; and a bonding step (F) of laminating and bonding a reinforcing film to an inner surface of the graphene-containing polyethylene (PE) film with a certain size which has passed through the step (E). In the step (A), at least one of graphene, graphene oxide (GO), and reduced graphene oxide (rGO) is used as a graphene raw material. According to the present invention, light transmission is prevented by applying the graphene-containing pellets and the shelf life of food is increased such that food can be safely stored for a long period of time.

Description

Food packaging material manufacturing method using graphene-containing pellets {METHOD FOR MANUFACTURING FOOD PACKAGING MATERIAL USING PELLET WITH GRAPHENE}

The present invention relates to a food packaging material manufacturing method using graphene-containing pellets, and more particularly, by applying graphene-containing pellets to food packaging material to prevent light transmission to increase the shelf life, and to improve strength and antibacterial function It relates to a method for manufacturing a food packaging material using graphene-containing pellets.

Food packaging is an important technology for maintaining food freshness and storing food for a long time, and its importance is increasing day by day. In particular, fruits, vegetables, and meat with a lot of moisture have a problem in that the freshness decreases rapidly as the shelf life is longer. Methods are being used to maintain freshness for a longer period by adding substances that are present.

Various packaging methods are used to maintain freshness, such as a method of increasing the antibacterial property of a packaging material by coating an antibacterial material on the packaging material of a food, or a method of sealing and vacuum packaging food. Meat food such as chicken has a problem in that the deterioration of freshness of meat is accelerated due to aging and aging of meat due to heat and various gases generated by the breathing of meat during storage. Various packaging materials are being developed to maintain the freshness of food by adsorption.

Meanwhile, awareness of food quality maintenance is increasing due to a surge in delivery volume as consumers' consumption culture changes to a delivery culture such as online ordering. The possibility of spoilage and deterioration (oxidation) of the food is also increasing, so it is possible to more effectively maintain freshness, and to preserve the shape and quality of food during storage, storage and transportation of functional food packaging materials with high mechanical strength and antimicrobial properties. development is required.

Therefore, in order to solve the above problems, the present invention uses polyethylene (PE) pellets containing graphene to prevent light transmission by applying it to food packaging, and food using graphene-containing pellets with improved strength and antibacterial function An object of the present invention is to provide a method for manufacturing a packaging material.

The method for manufacturing a food packaging material using the graphene-containing pellets of the present invention for achieving the above object is (A) preparing raw materials for composition and blending 0.01 parts by weight to 5 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) an extrusion molding step of extruding the graphene-containing polyethylene (PE) pellets processed in step (B) into a film processing facility and extruding them into a graphene-containing polyethylene (PE) film having a certain thickness; (D) a printing step of forming a printing layer on the outer surface of the graphene-containing polyethylene (PE) film extruded in step (C); (E) a winding and cutting step of winding the graphene-containing polyethylene (PE) film on which the printed layer is formed in the step (D) at a constant speed and then cutting it to a required size; (F) a bonding step of laminating and laminating a reinforcement film on the inner surface of the graphene-containing polyethylene (PE) film of a certain size that has undergone the step (E); , graphene oxide (GO), and reduced graphene oxide (rGO) is characterized in that at least one type is used.

In addition, below will be described more various embodiments of the food packaging material manufacturing method using the graphene-containing pellets in the present invention.

As described above, the present invention provides a food packaging material manufacturing method using graphene-containing pellets, by applying the graphene-containing pellets to prevent light transmission, thereby increasing the shelf life of food, so that food can be safely stored for a long period of time, strength and It is possible to provide a food packaging material manufacturing method using graphene-containing pellets with improved antibacterial function.

1 is a manufacturing process diagram shown to explain a food packaging material manufacturing method using graphene-containing pellets according to an embodiment of the present invention.

The present invention provides a method for manufacturing a food packaging material using graphene-containing pellets.

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

1 is a diagram of a food packaging material manufacturing process using graphene-containing pellets.

As shown in FIG. 1, the method for manufacturing a food packaging material using the graphene-containing pellets of the present invention includes a raw material preparation step, a pellet processing step, an extrusion molding step, a printing step, a winding and cutting step, and a bonding step.

In the raw material preparation step, 0.01 parts by weight to 5 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 0.2-0.8.

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 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.

In the extrusion molding step, the polyethylene (PE) pellets containing graphene processed in the pellet processing step are put into a film processing facility and extrusion-molded into a graphene-containing polyethylene (PE) film having a certain thickness.

The graphene-containing polyethylene (PE) film may be formed to a thickness of 15 μm to 50 μm.

Here, the pellet processing step or the extrusion molding step can be extruded by maintaining a temperature of 260 ° C. to 300 ° C., and adjusting the extrusion rate to 7 kg / hr to 15 kg / hr.

In the printing step, a printing layer is formed on the outer surface of the graphene-containing polyethylene (PE) film extruded in the extrusion molding step.

In the printing step, gravure printing and the like may be performed, and the printing speed may be adjusted from 100 m/min to 180 m/min.

The printing step may be omitted if necessary.

In the winding and cutting step, the graphene-containing polyethylene (PE) film on which the printed layer is formed in the printing step is wound at a constant speed, and then cut to a required size.

If the winding and cutting step is omitted from the printing step, the graphene-containing polyethylene (PE) film that is extruded in the form of a film through the extrusion step can be wound and cut.

In the bonding step, a reinforcing film is added to the inner surface of a graphene-containing polyethylene (PE) film of a certain size that has undergone winding and cutting steps, and lamination is performed.

In this case, the reinforcing film may be any one of an ethylene vinyl alcohol copolymer (EVOH) film, a nylon film, an aluminum film, an antibacterial film, a far-infrared radiation film, and a graphene-containing polyethylene (PE) film having no printed layer.

Here, the graphene-containing polyethylene film without the printed layer may be a graphene-containing polyethylene film obtained through the raw material preparation step, the pellet processing step, and the extrusion molding step.

The ethylene vinyl alcohol copolymer (EVOH) film has excellent moisture and oxygen barrier properties, so it is possible to protect foods that are easily discolored or odor due to oxidation.

The nylon film has excellent thermal stability and can protect food.

The aluminum film has a low gas permeability to prevent deterioration of food while preventing the odor of food from leaking to the outside.

The antibacterial film is at least one of cinnamon, chamomile, citronella, centella asiatica, peppermint, eoseongcho, eugeunpi, yeonkyo, creation, earth worm, hawthorn, yellow lotus, gold, bergamot, chitosan, wasabi, mustard seed, and extracts from coffee may be coated on a base film such as polyethylene, polyvinyl alcohol, or methyl cellulose, or extruded into a film by mixing with a polymer raw material such as polyethylene, polyvinyl alcohol or methyl cellulose.

Here, in the extract, it is preferable to use it as an extract when coating, and use it as an extract powder when blending with a polymer raw material.

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% ethyl alcohol and maintaining it 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.

And, the extract may be an extract powder obtained by freeze-drying and powdering the extract extracted by the above-described process.

Here, the extract can be used by mixing it with vegetable oil in a weight ratio or volume ratio of 1 to 1.2: 0.2 to 0.6 to increase dispersibility and uniform coating.

Here, the vegetable oil may be grape seed oil, sunflower seed oil, olive oil, rapeseed oil, camellia oil, and the like.

The anion radiation film is formed by coating a mineral solution of any one or more of germanium, illite, zeolite, volcanic stone, and diatomaceous earth on a base film such as polyethylene, polyvinyl alcohol or methyl cellulose, or polyethylene, polyvinyl alcohol or methyl cellulose, etc. of a polymer raw material of germanium, illite, zeolite, volcanic stone, and mineral powder of any one or more of diatomaceous earth may be mixed and extruded in the form of a film.

Here, the mineral solution is a mineral powder by any one of germanium, illite, zeolite, volcanic stone, and diatomaceous earth, cinnamon, chamomile, citronella, centella, peppermint, eoseongcho, eugeunpi, Yeongyo, creation, jigja, sansa , yellow lily, gold, bergamot, chitosan, wasabi, mustard seed, extract (extract) and 0.3-0.8 (mineral powder) by any one of coffee: It may be formulated in a weight ratio of 0.8-1.5 (extract).

Here, the anion radiation film may be formulated in an amount of 5 to 20 parts by weight of mineral powder based on 100 parts by weight of a polymer raw material, cinnamon, chamomile, citronella, centella asiatica, peppermint, eoseongcho, Yugeunpi, Yeongyo, Changjo, Jijija , hawthorn, yellow rhododendron, gold, bergamot, chitosan, wasabi, mustard seed, coffee by any one of the extract (extract solution or extract powder) 1 to 10 parts by weight of further blending may be extrusion molding.

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 pH 6-7, 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 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 to 300°C was maintained, and the extrusion rate was adjusted to 10 kg/hr.

(Example 4)

Preparation of film using graphene-containing PE pellets

The PE pellets containing graphene obtained in Example 3 were put into a film processing facility to prepare a film having a thickness of 30 μm.

(Comparative Example 1)

Preparation of general (non-graphene pellets) PE film

Using graphene-free linear low-density polyethylene (LLDPE) pellets, it was put into a film processing facility to prepare a film with a thickness of 30 μm. This film was used as a control.

(Test Example 1)

Analysis of physical properties of food packaging film containing graphene pellets

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.

PE film of the present invention control film light blocking rate
(300nm~400nm) 92% 66% Light blocking rate (400nm~500nm) 81% 58% Light blocking rate (500nm~600nm) 73% 41% Oxygen permeability (cc/m 2day,at 25℃RH30) 0.1 1.3 Water permeability (cc/m 2day) 0.2 3

According to Table 1, the PE film containing the graphene pellets of the present invention showed a high light blocking rate in the wavelength region of 300 nm to 600 nm compared to the control film. In addition, the oxygen permeability of the PE film containing graphene pellets was 0.1 cc/m 2day (25°C, relative humidity 30%), which is significantly lower than that of the control film of 1.3 cc/m 2day (25°C, relative humidity 30%). , the water permeability of the PE film containing graphene pellets was 0.2cc/m2day, which was lower than that of the control film 3cc/m2day. The transmittance and moisture permeability were improved compared to the general film without any treatment.

Accordingly, through the present invention having the above-described manufacturing method, it is possible to increase the shelf life of food by preventing the transmission of light through containing graphene, and it is possible to manufacture and supply graphene-containing food packaging material that can safely store food. .

Claims (9)

(A) a raw material preparation step of composition and blending 0.01 parts by weight to 5 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) an extrusion molding step of extruding the graphene-containing polyethylene (PE) pellets processed in step (B) into a film processing facility and extruding them into a graphene-containing polyethylene (PE) film having a certain thickness;
(D) a printing step of forming a printing layer on the outer surface of the graphene-containing polyethylene (PE) film extruded in step (C);
(E) a winding and cutting step of winding the graphene-containing polyethylene (PE) film on which the printed layer is formed in the step (D) at a constant speed and then cutting it to a required size;
(F) a bonding step of laminating and laminating a reinforcement film on the inner surface of the graphene-containing polyethylene (PE) film of a certain size that has undergone the step (E); 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 centrifuge to obtain a graphene solution;
(6) freeze-drying the graphene solution and then pulverizing to prepare a graphene powder; A food packaging material manufacturing method using graphene-containing pellets, characterized in that manufactured with (A) a raw material preparation step of composition and blending 0.01 parts by weight to 5 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) an extrusion molding step of extruding the graphene-containing polyethylene (PE) pellets processed in step (B) into a film processing facility and extruding them into a graphene-containing polyethylene (PE) film having a certain thickness;
(D) a printing step of forming a printing layer on the outer surface of the graphene-containing polyethylene (PE) film extruded in step (C);
(E) a winding and cutting step of winding the graphene-containing polyethylene (PE) film on which the printed layer is formed in the step (D) at a constant speed and then cutting it to a required size;
(F) a bonding step of laminating and laminating a reinforcement film on the inner surface of the graphene-containing polyethylene (PE) film of a certain size that has undergone the step (E); 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 food packaging material manufacturing method using graphene-containing pellets, characterized in that manufactured with (A) a raw material preparation step of composition and blending 0.01 parts by weight to 5 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) an extrusion molding step of extruding the graphene-containing polyethylene (PE) pellets processed in step (B) into a film processing facility and extruding them into a graphene-containing polyethylene (PE) film having a certain thickness;
(D) a printing step of forming a printing layer on the outer surface of the graphene-containing polyethylene (PE) film extruded in step (C);
(E) a winding and cutting step of winding the graphene-containing polyethylene (PE) film on which the printed layer is formed in the step (D) at a constant speed and then cutting it to a required size;
(F) a bonding step of laminating and laminating a reinforcement film on the inner surface of the graphene-containing polyethylene (PE) film of a certain size that has undergone the step (E); 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 food packaging material manufacturing method using graphene-containing pellets, characterized in that manufactured with 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 material using graphene-containing pellets, characterized in that it is blended in a weight ratio or volume ratio of 0.2 to 0.8. 4. The method according to any one of claims 1 to 3,
The reinforcing film is
Ethylene vinyl alcohol copolymer (EVOH) film, nylon film, aluminum film, antibacterial film, anion radiation film, graphene-containing pellets, characterized in that any one of the graphene-containing polyethylene (PE) film without a print layer. Food packaging material manufacturing method. 6. The method of claim 5,
The antibacterial film,
One or more of extracts from cinnamon, chamomile, citronella, centella, peppermint, eoseongcho, eugeunpi, yeonkyo, creation, guja, hawthorn, yellow lily, gold, bergamot, chitosan, wasabi, mustard seed, and coffee are selected from polyethylene or poly It is coated on a base film of vinyl alcohol or methyl cellulose or extruded into a film by mixing it with a polymer raw material of polyethylene, polyvinyl alcohol or methyl cellulose;
The extract is an extract during coating, and a food packaging material manufacturing method using graphene-containing pellets, characterized in that it is an extract powder when blended with a polymer raw material. 6. The method of claim 5,
The anion radiation film,
A mineral solution of any one or more of germanium, illite, zeolite, volcanic stone, and diatomaceous earth is coated on a base film made of polyethylene, polyvinyl alcohol, or methyl cellulose, or germanium, A method for manufacturing a food packaging material using graphene-containing pellets, characterized in that it is extruded in the form of a film by mixing a mineral powder of any one or more of illite, zeolite, volcanic stone, and diatomaceous earth. 7. The method of claim 6,
When the extract is coated on the base film,
To increase dispersibility and uniform coating, use a mixture in a weight ratio or volume ratio of extract: vegetable oil = 1-1.2: 0.2-0.6.
The vegetable oil is a food packaging material manufacturing method using graphene-containing pellets, characterized in that any one of grape seed oil, sunflower seed oil, olive oil, rapeseed oil, and camellia oil.
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