KR102218100B1 - Antibacterial film for food packaging - Google Patents

Abstract

The present invention relates to an antibacterial film for food packaging. According to the present invention, the antibacterial film for food packaging comprises: a first substrate; a second substrate; and a coating layer disposed between the first substrate and the second substrate, wherein the coating layer is formed by applying a coating solution composition containing wasabi extract oil and a solvent to the substrates and drying the same. Accordingly, since the antibacterial film for food packaging is manufactured by including wasabi extract oil, the freshness of food can be maintained for a long period, and an antibacterial material can show an antibacterial effect and suppress bacterial spoilage without direct contact with the food.

Description

Antibacterial film for food packaging {ANTIBACTERIAL FILM FOR FOOD PACKAGING}

The present invention relates to an antibacterial film for food packaging, and more particularly, by coating a film including horseradish extract oil to prepare an antibacterial film for food packaging, it is possible to maintain the freshness of food for a long time, and if the antibacterial substance does not directly contact the food It relates to an antibacterial film for food packaging that can exhibit antibacterial effects and inhibit bacterial spoilage.

Recently, as the number of single-person households increases and the standard of living improves, the amount of use of packaging materials to protect food is increasing, and food packaging materials are required not only to protect the contents, but also to maintain quality.

In general, food packaging materials must have excellent water resistance and oil resistance, and for this purpose, various synthetic resins such as polyethylene, polypropylene, polyvinyl chloride, and urethane, which are general-purpose resins, are coated on the surface of the base paper such as paper. When an auxiliary agent for imparting adhesiveness is additionally required, and a synthetic resin containing these substances is coated on the packaging, it may adversely affect the human body due to the elution of harmful substances, and environmental hormones are released during the disposal process.

In general, a phenomenon in which food is decomposed into low-molecular substances by the action of microorganisms, rays, oxygen, chemicals, etc., resulting in loss of its original quality, such as taste, smell, color, and appearance, is called deterioration or deterioration. In order to suppress this phenomenon, it is necessary to minimize contamination of microorganisms and chemical substances through a hygienic manufacturing process, and it is key to minimize contact of the contents from deterioration factors (light, moisture, oxygen, etc.) that affect food contents during distribution. to be.

In particular, since the moisture content of the contents and the oxygen concentration inside the package directly affect the growth of microorganisms and the rancidity of the contents, the selection of packaging materials with adequate moisture and oxygen barrier properties and antibacterial properties for stable storage and distribution of food contents Application is a very important factor in the development of processed foods.

Domestic registration patent No. 10-1004027 (registered on December 20, 2010) Domestic registered patent No. 10-1417767 (registered on July 03, 2014) Domestic registered patent No. 10-1181448 (registered on September 04, 2012)

The present invention provides an antibacterial film for food packaging by coating it on a film including horseradish extract oil, so that the freshness of the food can be maintained for a long period of time, and the antibacterial substance does not directly contact the food, showing the antibacterial effect and inhibiting bacterial spoilage. It is to provide an antibacterial film for food packaging.

Various problems to be solved by the present invention are not limited to the problems mentioned above, and other problems that are not mentioned will be clearly understood by those skilled in the art from the following description.

The antimicrobial film for food packaging according to the present invention includes a first substrate, a second substrate, and a coating layer positioned between the first and second substrates, and the coating layer comprises a coating liquid composition comprising wasabi extract oil and a solvent. It is formed by drying after application.

The coating liquid composition is mixed in a weight ratio of 10 to 30 parts by weight of wasabi extract oil and 5 to 15 parts by weight of a solvent, and ethanol may be used as the solvent.

The coating solution composition is prepared by including a self-emulsifying epoxy resin, an acrylic modified polyester resin, a deodorant bead and a curing agent in addition to the wasabi extract oil and solvent, and the coating solution composition is 10 to 30 parts by weight of wasabi extract oil, solvent 5 To 15 parts by weight, 10 to 20 parts by weight of a self-emulsifying epoxy resin, 5 to 10 parts by weight of an acrylic modified polyester resin, 1 to 3 parts by weight of a deodorant bead, and 0.1 to 1 parts by weight of a curing agent.

Details of other embodiments are included in the detailed description.

The antimicrobial film for food packaging according to the present invention can maintain the freshness of the food for a long period of time by including wasabi extract oil, and can exhibit an antibacterial effect without direct contact of the antimicrobial material with the food and suppress bacterial spoilage.

It will be fully understood that the embodiments of the technical idea of the present invention can provide various effects not specifically mentioned.

1 is a view showing a schematic cross-section of an antibacterial film for food packaging according to an embodiment of the technical idea of the present invention.
2 is a view showing a schematic cross-section of an antibacterial film for food packaging according to another embodiment of the technical idea of the present invention.
3 and 4 are product photos showing an antibacterial film for food packaging according to an embodiment of the technical idea of the present invention.
5 is a test report showing the heavy metal content of the antimicrobial film for food packaging prepared according to the Example.

Advantages and features of the present invention, and a method of achieving them will become apparent with reference to the embodiments described below in detail. However, the present invention is not limited to the embodiments described herein and may be embodied in other forms. Rather, the embodiments introduced herein are provided so that the disclosed content may be thorough and complete, and the spirit of the present invention may be sufficiently conveyed to those skilled in the art.

The terms used in the present application are only used to describe specific embodiments, and are not intended to limit the present invention. Singular expressions include plural expressions unless the context clearly indicates otherwise.

Unless otherwise defined, all terms including technical or scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present invention belongs. Terms such as those defined in a commonly used dictionary should be interpreted as having a meaning consistent with the meaning of the related technology, and should not be interpreted as an ideal or excessively formal meaning unless explicitly defined in this application. Does not.

Hereinafter, with reference to the accompanying drawings will be described in detail with respect to a preferred embodiment for the antibacterial film for food packaging according to the present invention.

1 is a view showing a schematic cross-section of an antibacterial film for food packaging according to an embodiment of the technical idea of the present invention, Figure 2 is a schematic cross-sectional view of an antibacterial film for food packaging according to another embodiment of the technical idea of the present invention 3 and 4 are product photographs showing an antibacterial film for food packaging according to an embodiment of the inventive concept.

1, 3 and 4, the technical idea of the present invention is the antimicrobial film 10 for food packaging according to an embodiment, a first substrate 100a, a second substrate 100b, and the first substrate ( 100a) and a coating layer 300 positioned between the second substrate 100b.

As the first and second substrates 100a and 100b, a known polypropylene film may be used, and the polypropylene film is widely applied as a protective film applied to the inner surface of food or pharmaceutical packaging. More specifically, the polypropylene film is applied to the inner surface of a food or medicine package to protect the food or medicine, and at the same time, the inner films facing each other are bonded by heat to seal the food or medicine.

Non-stretched polypropylene (CPP; casting polypropylene) film is a non-stretched film, manufactured by the T-Die method, and is inexpensive and excellent in heat adhesion, so it is widely used as a material for flexible packaging such as food packaging. It is composed of a skin layer, a core layer, and a sealing layer, and the sealing layer is a part where adhesion between the sealing layers is made by applying heat, and generally a polypropylene resin having excellent such properties is used. .

In the present invention, the polypropylene film used as the first substrate 100a and the second substrate 100b may be a commercially available polypropylene film. For clarity and convenience of explanation of the technical idea of the present invention For the purpose, a detailed description of the polypropylene film will be omitted.

The coating layer 300 is located between the first substrate 100a and the second substrate 100b, is formed by being coated on the surfaces of the first substrate 100a and the second substrate 100b, and the coating layer 300 By including wasabi extract oil, the antibacterial film for food packaging prepared according to the present invention can maintain the freshness of the food for a long period of time, and exhibit an antibacterial effect without direct contact of the antibacterial substance to the food, and can suppress bacterial spoilage.

The coating layer 300 may be prepared by mixing and then mixing a coating solution composition at a constant weight ratio, and the coating solution composition includes horseradish extract oil and a solvent, and the coating solution composition includes wasabi extract oil 10 to 30 parts by weight And 5 to 15 parts by weight of the solvent are mixed in a weight ratio, and ethyl alcohol (ethanol) may be used as the solvent.

In addition, as the wasabi extract oil, wasabi extract oil prepared by the following method may be used.

In order to prepare the wasabi extract oil, first, wasabi may be prepared and then washed cleanly in water.

The wasabi (Wasabia koreana, Wasabia japonica) is an evergreen, perennial ripening semi-shaded plant belonging to the cruciferous family, sinigrin, allylisothiocyanate, vitamin C (vitamin C), glucose, As it contains KHSO ₄ , it is known as a substance that can be used for the purpose of preventing spoilage, antibacterial and edible spices.

Next, the washed wasabi can be steamed.

In the above step, the steaming may be performed by steaming the washed wasabi for 30 to 60 minutes with steam, but when the steaming of the wasabi is performed below the above lower limit, sufficient steaming is not achieved. In addition, when it is performed in excess of the upper limit range, the difference in effect according to the increase of the steaming time may be insignificant.

Next, the steamed wasabi may be washed with one or more of acetic acid or citric acid.

The washing of the steamed wasabi in the above step is effective in improving the flavor and color of the produced wasabi extract oil by washing the surface of the steamed wasabi with at least one acid of acetic acid or citric acid.

Subsequently, the wasabi washed with the acid may be dried.

In the above step, the drying is performed at a temperature of 20 to 22°C and a humidity of 55 to 60% for 10 to 30 hours in order to prevent the chlorophyll of the wasabi from being destroyed and the useful components volatilized during sunlight drying. It can be dry.

Next, the dried wasabi may be extracted to prepare wasabi extract oil.

As a method of extracting the dried wasabi in the above step to obtain wasabi extract oil, for example, there are various known methods such as steam distillation method, compression method, and extraction method, and the method of preparing the oil in the present invention is Various known methods as described above may be used, but for convenience of explanation and clarity of the technical idea of the present invention, a detailed description of a method of obtaining wasabi extract oil by extracting the fermented wasabi will be omitted. .

The coating composition may be prepared by including a self-emulsifying epoxy resin, an acrylic modified polyester resin, a deodorant bead and a curing agent in addition to the wasabi extract oil and solvent, thereby providing effects such as antibacterial and deodorizing properties.

That is, the coating liquid composition is 10 to 30 parts by weight of wasabi extract oil, 5 to 15 parts by weight of solvent, 10 to 20 parts by weight of self-emulsifying epoxy resin, 5 to 10 parts by weight of acrylic modified polyester resin, 1 to 3 deodorizing beads It may be prepared by mixing in a weight ratio of 0.1 to 1 part by weight of a curing agent and 0.1 part by weight.

The self-emulsifying epoxy resin is an epoxy resin having an active group that can be emulsified in itself, and the self-emulsifying epoxy resin is a self-emulsifying modified epoxy resin having an epoxy equivalent of 200 to 230 g/eq. , Weather resistance, water resistance, and other physical properties can be remarkably improved.

The acrylic-modified polyester resin is condensed and polymerized with a polybasic acid containing 40 to 50% by weight of anhydrous acid and 50 to 60% by weight of an aliphatic acid by condensation polymerization of a polyhydric alcohol containing 80 to 90% by weight of a diol and 10 to 20% by weight of a triol. To prepare a polyester resin having a value of 45 to 65 mgKOH/g, an acid value of 3 mgKOH/g or less, a glass transition temperature of 5 to 20°C, and a weight average molecular weight (Mw) of 2,500 to 3,500, and the polyester resin 50 to 60 weight % And 40-50% by weight of acrylic monomer are grafted to have a weight average molecular weight (Mw) of 5,000 to 7,000, a hydroxyl value of 50 to 60 mgKOH/g, an acid value of 3 mgKOH/g or less, and a glass transition temperature of 10 to 20°C An acrylic modified polyester resin in the range can be prepared.

The deodorant beads may be used to alleviate and remove unpleasant odors that may occur in packaged foods, and the deodorant beads may be deodorized beads prepared by the following method.

First, a mixed solution in which a water-soluble ethylenically unsaturated monomer, a hydrophilic additive, and a crosslinking agent are mixed at a certain weight ratio can be prepared, the mixed solution is 200 to 300 parts by weight of a water-soluble ethylenically unsaturated monomer, 30 to 50 parts by weight of a hydrophilic additive, and It may be mixed in a weight ratio of 10 to 20 parts by weight of the crosslinking agent.

The water-soluble ethylenically unsaturated monomers include methacrylic acid, maleic anhydride, crotonic acid, itaconic acid, 2-acryloylethane sulfonic acid, 2-methacryloylethanesulfonic acid, 2-methacryloylpropanesulfonic acid or 2-methacrylic acid. Anionic monomers of amide-2-methyl propane sulfonic acid and salts thereof; Any one or more selected from the group consisting of methacrylamide, N-substituted methacrylate, 2-hydroxyethyl methacrylate, 2-hydroxypropyl methacrylate, and methoxypolyethylene glycol methacrylate may be used.

The hydrophilic additive may be formed of the absorbent polymer and then eluted in the absorbent polymer, thereby forming a microcavity inside the absorbent polymer and forming a microcavity formed inside the absorbent polymer.

The hydrophilic additive may be one or more selected from the group consisting of sodium dodecyl sulfate, phosphate, sorbitan monolaurate, sorbitan monopalmitate, sorbitan monostearate, and sorbitan monooleate.

The crosslinking agent is added to maintain stable gel strength. For example, the crosslinking agent includes bis(meth)acrylamide having 8 to 12 carbon atoms, poly(meth)acrylate of a polyol having 2 to 10 carbon atoms, and 2 carbon atoms. One or more selected from the group consisting of poly(meth)allyl ethers of polyols of to 10 may be used.

Next, after adding purified water to the mixed solution in which the water-soluble ethylenically unsaturated monomer, hydrophilic additive, and crosslinking agent are mixed, it may be stirred.

The purified water is used to disperse a mixed solution containing the water-soluble ethylenically unsaturated monomer, a hydrophilic additive, and a crosslinking agent, and the purified water may be used in an amount of 50 to 100 parts by weight based on 100 parts by weight of the total mixed solution.

Then, a polymerization initiator may be added to the mixed solution in which the purified water is mixed to form a polymer.

The polymerization initiator may be a thermal polymerization initiator or a photopolymerization initiator according to UV irradiation depending on the polymerization method, and a photo polymerization initiator may be used as the polymerization initiator in the present invention, for example, benzoin ether as the photo polymerization initiator (benzoin ether), dialkyl acetophenone, hydroxyl alkylketone, phenyl glyoxylate, benzyl dimethyl ketal, acyl phosphine and alpha -One or more selected from the group consisting of aminoketone (α-aminoketone) may be used. Meanwhile, as a specific example of acylphosphine, a commercially available lucirin TPO, that is, 2,4,6-trimethyl-benzoyl-trimethyl phosphine oxide (2,4,6-trimethyl-benzoyl-trimethyl phosphine oxide) may be used. .

Subsequently, the polymer may be dried and pulverized to prepare a polymer powder.

Drying of the polymer is performed at a temperature of 135 to 145°C, and the pulverization of the dried polymer is performed using a pulverizer such as a pin mill, a hammer mill, and a screw mill. It can be pulverized to be 1000 to 2000㎛.

Next, a deodorant bead may be prepared by mixing a deodorant liquid with the polymer powder.

The deodorant liquid may be used to prevent the propagation of unpleasant odors or microorganisms that may occur in packaged foods, and the deodorant liquid may be included in a weight ratio of 10 to 20 parts by weight based on 100 parts by weight of the polymer powder.

The deodorant solution consists of sodium citrate, sodium lactate, glycerin, potassium chloride, sodium chloride, vitamin B1 lauryl sulfate, sodium benzoate, grapefruit seed extract, hwangchil tree leaf extract and purified water, and the deodorant solution is 1 to 3 parts by weight of sodium citrate , Sodium lactate 2 to 4 parts by weight, glycerin 3 to 6 parts by weight, potassium chloride 0.5 to 1.5 parts by weight, sodium chloride 0.1 to 0.5 parts by weight, vitamin B1 lauryl sulfate 0.5 to 1.5 parts by weight, sodium benzoate 1 to 3 parts by weight, grapefruit It may be included in a weight ratio of 0.5 to 1.5 parts by weight of seed extract, 0.1 to 0.3 parts by weight of hwangchil tree leaf extract, and 5 to 10 parts by weight of purified water.

The sodium citrate is a white crystalline powder that is well soluble in water and the aqueous solution is acidic. The sodium citrate can be used as a pH adjuster, an anti-acid decay agent, a thickener, an emulsifier, a stabilizer, etc., and suppresses the decomposition of vitamin C. It can improve preservation and alleviate the acidity of citric acid.

The sodium lactate is a colorless liquid and is an additive for preparing salt foods with no odor or slightly peculiar odor. The chemical formula is C ₃ H ₅ NaO ₃ , soluble in water, the pH of the aqueous solution is 5.0~9.0, has properties similar to glycerin, can be used in food, and is used as an emulsifier, flavor enhancer, wetting agent, and pH adjuster.

The glycerin is a chemical formula C ₃ H ₅ OH) ₃ with a CAS number of 56-81-5, and is a colorless, odorless liquid. It has very strong viscosity, but it is a fat or oil component like fatty acids, and is obtained by decomposing fats and oils industrially. Glycerin is a trihydric alcohol with three hydroxyl groups. It is a colorless, sticky liquid, has hygroscopicity, a little sweetness, and has a melting point of 20℃ and a boiling point of 290℃. In addition to being used as a synthetic raw material such as glyphtal resin, glycerin is used in drugs such as lubricants or ointments, antiseptic agents for cigarettes and cosmetics, refining agents, etc., as well as anti-freezing agents, coolants, It is an important material with a very wide application such as printing ink. Therefore, nowadays, not only by the decomposition of oils and fats, but also by the synthesis method using propylene as a raw material, natural products and synthetic products occupy almost the same amount.

In nature, about 0.08% of potassium chloride is contained in seawater and is obtained from a mineral called sylvine or sylvite. The crystals belonging to the white tetragonal system (正方晶系) and naturally produced are mixed with bitter taste and salty taste. The potassium chloride is well soluble in water, conducts an electric current well, and contains potassium ions, an alkali metal element, and thus undergoes a purple flame reaction. In addition, the potassium chloride is industrially used as a raw material for preparing a potassium salt, and in a laboratory, it is used as a buffer solution and an electrode solution. The single crystal of potassium chloride (KCl) can be used in the manufacture of a prism or cell window used for infrared absorption measurement, and is used as a heat treatment agent, photographic reagent, medicine, and the like.

The sodium chloride is a compound of sodium and chlorine and is the main component of edible salt. The proportion of salts in seawater is the largest, and sodium chloride is well soluble in water, which is the same polar solvent, because sodium ions (Na+) and chloride ions (Cl-) are combined to have a polar structure. In addition, the crystal structure of sodium chloride is a form in which each atom having an octahedron has 6 nearest neighbors.

The vitamin B1 lauryl sulfate has a molecular weight of 815.19, CAS No. 39479-63-5, and is colorless or white crystals or white crystal powders with no odor or a slightly peculiar odor. Since the vitamin B1 lauryl sulfate can be used as a food nutrient enhancer and has antibacterial properties, it has been in the spotlight as a preservative in various food factories. In addition, the vitamin B1 lauryl sulfate has recently been researched to replace disinfectants used in various fields using TLS, and is being developed as an eco-friendly disinfectant that is completely harmless to the human body.

The sodium benzoate is a kind of preservative added to food to prevent spoilage and deterioration caused by the proliferation of microorganisms, and inhibits the growth of bacteria, molds, yeast, and the like in food.

The grapefruit seed extract (GSE) has antibacterial, antifungal, and antioxidant effects, and in toxicity experiments, it was confirmed that there is little toxicity compared to sodium benzoate and potassium sorbate. In particular, ascorbic acid, ascorbyl palmitate, and tocopherol among the components of the grapefruit seed extract weaken the functions of cell walls and cell membranes of perishable and pathogenic microorganisms, inhibit enzyme activity, and prevent cell proliferation mechanisms originating from DNA/RNA. , It has a bactericidal effect on yeast and mold, and has an inhibitory effect on the growth of mold and toxin synthesis.

The Hwangchil tree leaf extract is prepared by extracting from the leaves of the Hwangchil tree, and the Hwangchil tree (Dendropanax morbifera Lev) is an evergreen broad-leaved arboreous tree of the genus Araliaceae. Young branches are green and glossy, flowers bloom in June, and the 7~19mm long fruit ripens black. It is a temperate plant that grows in areas where the minimum temperature is above -2℃ and the average annual temperature is above 12~15℃.

Hwangchil wood secretes hwangchil, which is generally composed of 66.7% non-volatile components, 10.8% aroma, 8.1% moisture, and 14.4% solids, which are paint components that form a golden coating. It is known to consist of quiterpenes β-cubebene, γ-selinene, and δ-cadinene. The fragrance component contained in Hwangchil not only has the value as a benzoin that makes the mind and body clear and comfortable, but also has a variety of pharmacological effects, so it is highly useful as a perfume, cosmetic, or functional food and beverage.

The hwangchil tree leaf extract may be used as a hwangchil tree leaf extract prepared by the following manufacturing method.

First, in order to prepare a hwangchil tree leaf extract, hwangchil tree leaves may be prepared and washed.

Next, the washed hwangchil tree leaves can be pulverized into a certain particle size.

In the above step, the active ingredients of the hwangchil tree leaves may be sufficiently extracted by pulverizing the leaves of the hwangchil tree to a certain particle size, and the crushing of the leaves of the hwangchil tree may be pulverized so that the particle diameter ranges from 500 to 2500 μm. . If the particle size of the leaves of the Hwangchil tree is pulverized to less than 500 μm in the above step, it takes a long time to crush, and the particles are too small to cause agglomeration between particles in a later process, and when the particles exceed 2500 μm There may be a problem in that it is difficult to effectively extract useful ingredients from the leaves of the Hwangchil tree.

Next, the pulverized hwangchil tree leaf extract may be obtained by applying ultrasonic waves in an atmosphere of low temperature and reduced pressure to remove solids.

In the above step, after preparing a mixture by mixing the pulverized Hwangchil tree leaves with a solvent, it is introduced into an ultrasonic extractor to apply ultrasonic waves to the mixture, and the solids contained in the mixture are mixed with a known strainer such as a sieve, etc. Hwangchil tree leaf extract can be prepared by removing it using, and the solvent is mixed in a weight ratio of 1000 to 2000 parts by weight based on 100 parts by weight of the pulverized hwangchil tree leaf, and the solvent is water or carbon number 1 to 4 Any one or more solvents selected from alcohols of (C1 to C4) may be used.

In addition, in the step, the ultrasonic wave applied to the mixture under a temperature of 20 to 25°C and a pressure of 0.1 to 0.5 kgf/cm ² is output of 100 to 200 watts for 30 to 60 minutes at a vibration frequency of 30 to 50 KHz. Hwangchil tree leaf extract can be obtained by extracting by using.

The curing agent is included in the coating liquid composition to perform a function of curing, and the curing agent may be used by mixing a curing agent resin and a curing accelerator.

Modified aliphatic polyamine may be used as the curing agent resin, and 2,4,6-tridimethylaminomethylphenol may be used as the curing accelerator, and the curing agent resin and the curing accelerator are 4 to 8 parts by weight of the curing agent resin, respectively And 1 to 2 parts by weight of the curing accelerator may be mixed and used.

Referring to Figure 2, in order to enhance the adhesion between the first substrate (100a) and the second substrate (100b) and the coating layer 300, the antibacterial film for food packaging according to another embodiment of the technical idea of the present invention. A first primer layer 200a may be positioned between the first substrate 100a and the coating layer 300, and a second primer layer 200b may be positioned between the second substrate 100b and the coating layer 300.

The first primer layer (200a) and the second primer layer (200b) is a primer composition between the first substrate (100a) and the coating layer (300), respectively, between the second substrate (100b) and the coating layer (300). It can be prepared by drying after application, and the primer composition is a polyurethane acrylate oligomer, acrylic monomer, photocuring agent, solvent, polyvinyl alcohol, gelite, shell powder, mint Includes extracts and dispersants.

Specifically, the primer composition is a polyurethane acrylate oligomer (Oligomer) 40 to 60 parts by weight, acrylic monomer (monomer) 20 to 40 parts by weight, photocuring agent 1 to 3 parts by weight, solvent 80 to 120 parts by weight, polyvinyl Alcohol (polyvinyl alcohol) 3 to 7 parts by weight, gelite 2 to 4 parts by weight, shell powder 0.5 to 1.5 parts by weight, peppermint extract 1 to 3 parts by weight, and a dispersant may be included in a weight ratio of 1 to 2 parts by weight.

The polyurethane acrylate oligomer is a UV-curable compound having a weight average molecular weight (Mw) of 3,000 to 30,000, and may be formed by reacting polycarbonate and polyester diol with isocyanate and acrylate.

The polyurethane acrylate oligomer contains a urethane bond as a repeating unit, and generally exhibits flexible physical properties.The polyurethane acrylate oligomer is of various types, aliphatic urethane acrylate and aromatic urethane acryl depending on the type of isocyanate used. It is divided by rate.

The aliphatic urethane acrylate oligomer is a non-yellowing type, and usually has 2 to 20 functional groups, and an aromatic urethane acrylate oligomer is a yellowing type, and has fast reactivity.

In addition, the polyurethane acrylate oligomer may have 3 to 15 functional groups, and the number of functional groups may be the surface hardness and the first substrate 100a and the second substrate 100b by interaction with a solvent and a photocuring agent. It is possible to impart strong adhesion to and.

Examples of the functional group include urethane acrylate, epoxy acrylate, carboxylic acid, carboxylic anhydride, an acrylate-based functional group having a C=C double bond (eg, methacrylate, acrylate, etc.), SH Groups, alcohols, esters, ethers, triethylene glycolate, chelating agents (e.g., aminotriethanolate, amino diethanolate, acetylacetonate, ethylacetoacetate, lactate, etc.), amine groups, amides , Oxazoline and carbamate may be used alone or in combination of two or more.

The acrylic monomer may serve as a diluent for increasing the strength of the primer layer 200 formed of the primer composition and lowering the viscosity of the primer composition.

For example, the acrylic monomer is isobornyl acrylate (IBXA), phenoxyethyl acrylate (PEA), 1,6-hexanediol diacrylate (1,6-Hexanediol diacrylate; 1 ,6-HDDA) and pentaerythritol triacrylate (Pentaerythritol triacrylate; PETA) may be used.

The photocuring agent may be used to polymerize and cure the primer composition by initiating a reaction by absorbing ultraviolet rays and generating free radicals when the primer composition is applied to the mattress substrate 100 and then photocured using ultraviolet rays (UV). .

The photocuring agent may be a known material, for example, the photocuring agent is a hydroxy ketone series such as 1-hydroxy cyclrohexyl phenyl ketone (Irgacure 184), alpha-amino Amino ketone series such as acetophenone (α-Amino Acetophenone, Irgacure 907), benzyl dimethyl ketal series such as Benzyl Dimethyl Ketal (Irgacure-651), phenyl bis(2,4,6,-trimethyl benzoyl) ( Bis-acyl phosphine series such as phenyl bis (2,4,6-trimethyl benzoyl), Irgacure 819), and 2,4,6-trimethylbenzoyl-diphenylphosphine oxide (TPO) Mono-acyl phosphine (mono-acyl phosphine) type photocuring agent can be used alone or in combination of two or more.

The solvent may be used to improve workability and adhesion by controlling viscosity and fluidity when applying the primer composition, and as the solvent, an ether-based solvent, an acetate-based solvent, an alcohol-based solvent, or a mixed solvent thereof may be used. I can.

For example, as the ether solvent, propylene glycol monopropyl ether, propylene glycol monomethyl ether, ethylene glycol monoethyl ether, ethylene glycol monopropyl ether, ethylene glycol monobutyl ether, diethylene glycol monomethyl ether, diethyl Glycol monoethyl ether, diethyl glycol monopropyl ether, diethyl glycol monobutyl ether, diethylene glycol-2-ethylhexyl ether, and the like may be used alone or in combination.

As the acetate-based solvent, butyl acetate, ethyl acetate, etc. may be used alone or in combination, and as the alcohol-based solvent, diacetone alcohol (DAA), n-butanol, methanol, ethanol, isopropyl alcohol, etc. may be used alone or as a mixture. Can be used.

The polyvinyl alcohol has characteristics such as excellent linearity, flat zig-zag conformation, high crystallinity, excellent alkali resistance to withstand pH 13.5 or higher, and excellent adhesion. Due to these characteristics, polyvinyl alcohol can be applied to polyvinyl alcohol fibers having high strength and high modulus of elasticity.

The application of the polyvinyl alcohol is expanding due to the excellent physical properties and various application ranges as described above. In particular, many studies have been conducted on the production of high-strength and high-elasticity gels and high-performance polyvinyl alcohol fibers using polyvinyl alcohol.

As an example, polyvinyl alcohol is applicable to a membrane separation technique using a polymer film. Polymer films are used in a very wide range of fields including chemical industry, biotechnology, resources, energy, and the environment. In particular, the pervaporation method capable of separating a liquid organic mixture or an organic aqueous solution has many advantages over traditional distillation methods, such as energy saving and device miniaturization, and is widely used in the production of anhydrous alcohol and separation of organic mixtures. Therefore, it can be said that polyvinyl alcohol has high utility in the field of polymer films.

In addition, polyvinyl alcohol can be applied to a technology for manufacturing microfibers by electrospinning technology. The method of producing microfibers by electrospinning technology is to induce the formation of a liquid jet in the solution discharged from the spinneret by applying a high voltage to the polymer resin solution, and at this time, the volatilization of the solvent is caused by an electrical repulsion force. It is characterized in that a fine fiber of a thickness is obtained by continuous stretching.

In particular, when using electrospinning technology, fiber yarns are accumulated in the collector in the form of a three-dimensional network of webs. These microfibers have high specific surface area and tension, as well as mechanical properties, chemical properties, and cell biomaterial recognition characteristics. do. Therefore, polyvinyl alcohol can be applied in a wide range of fields such as microfibers, industrial materials including filters, photochemical sensor materials, biomedical materials, and beauty materials.

The gelite (Ge-lite) is called pozzolan, contains about 2.0ppm germanium and contains a large amount of far-infrared rays and anions, such as volcanic ash, silicate clay, silicate and the like. That is, the gellite emits far-infrared rays equivalent to about 180 times that of loess, promotes plant growth, has a humidity control function, releases negative ions and human body active energy, has a function of blocking harmful electromagnetic waves, and has a deodorizing and sterilizing effect. It also provides the effect of neutralizing heavy metals.

The shell powder can be prepared by pulverizing the shell. In general, the shell is an inorganic secretion formation that wraps and protects the mollusk from mollusks, and such shells are various shellfish such as abalone shell, petrified shell, clam shell, scallop shell, etc. Depending on the type of pulverization, the texture and color are very beautiful and diverse, and due to the biochemically-formed porous calcium component, it has considerable insulation performance, and contaminants in the air through breathing with the surrounding air. It is known as a hygienic and eco-friendly material that has the ability to adsorb.

These shells are composed of organic substances such as proteins with calcium carbonate as the main component, so they are very dense and difficult to crush. If the shell is calcined at a high temperature of 1,100°C or higher for a certain period of time, carbon dioxide is oxidized and more than 98% of calcium (Ca) And calcium oxide containing minerals such as magnesium (Mg), potassium (K), sodium (Na), phosphorus (P) and sulfur (S).

These high-temperature calcined calcium oxides are natural minerals and are used as raw materials and materials in various fields such as antibacterial, sterilizing and preservative of yukga grain foods, sterilization of agricultural and marine products, fresh preservatives, health beverage additives, and cosmetics for skin beauty.

The shell powder may be a shell powder prepared by the following method.

First, the shell may be prepared and washed to remove foreign substances adhering to the shell.

The shell may be used any one or more shells selected from the group consisting of abalone, oyster, turban shell, cockle, clams, petrification, and shellfish, and the shell is washed with purified water in which sodium hydrogen carbonate (NaHCO ₃ ) is dissolved. By washing the surface of the shell by using, foreign substances remaining on the surface of the shell can be removed.

The sodium hydrogen carbonate (NaHCO ₃ ) is also used as a food additive, and has no toxicity, and has functions such as penetration, diffusion, and expansion, so that the surface of the shell can be cleanly washed, and the sodium hydrogen carbonate is 3 to 5% by weight. It has a concentration range and is preferably washed for 5 to 15 minutes at a temperature of 20 to 30°C.

Next, the washed shell may be first pulverized to prepare a shell granulated pulverized product.

In the above step, the washed shell is first pulverized using a granulator, so that impurities or organic residues inside the shell can be removed in a later process.The first pulverization is performed by using a granulator or a drum granulator. Although it may be performed using a known granulator such as a drum granulator or a compression pelletizer, it is not necessarily limited to the granulator described above.

Next, the pulverized shell granulated product may be immersed in a mixture consisting of nitric acid, phosphate compound, persulfate, acetic acid, and purified water.

In the above step, impurities or organic residues contained in the shell granulated pulverized product can be removed by immersing the shell granulated pulverized product in a mixture consisting of nitric acid, a phosphate compound, persulfate, acetic acid, and purified water. The mixed solution consisting of a phosphate compound, persulfate, acetic acid and purified water is composed of 0.1 to 0.5% by weight of nitric acid, 0.5 to 1.5% by weight of a phosphate compound, 0.01 to 0.1% by weight of persulfate, 1 to 3% by weight of acetic acid, and the remaining amount of purified water, The shell granulated pulverized product may be immersed in a mixture consisting of the nitric acid, phosphate compound, persulfate, acetic acid and purified water for 10 to 30 minutes.

In addition, as the phosphate compound in the step, first sodium phosphate (NaH ₂ PO ₄ ), second sodium phosphate (Na ₂ HPO ₄ ), third sodium phosphate (Na ₃ PO ₄ ), first potassium phosphate (KH ₂ PO ₄ ), second potassium phosphate (K ₂ HPO ₄ ), first ammonium phosphate ((NH ₄ ) H ₂ PO ₄ ), second ammonium phosphate ((NH ₄ ) ₂ HPO ₄ ) and tertiary ammonium phosphate (( NH ₄ ) ₃ PO ₄ ) Any one or more selected from the group consisting of may be used, and the persulfate is ammonium persulfate ((NH ₄ ) ₂ S ₂ O ₈ ), sodium persulfate (Na ₂ S ₂ O ₈ ) Or potassium persulfate (K ₂ O ₈ S ₂ ) Any one or more selected from may be used.

Subsequently, the shell granulated pulverized product may be separated and taken out from the mixed solution consisting of nitric acid, phosphate compound, persulfate, acetic acid, and purified water, and then the shell granulated pulverized product may be heated and fired using a sintering furnace.

In the above step, by heating the separated shell granulated pulverized product using a sintering furnace, contaminants adsorbed to the fine pores of the shell granulated pulverized may be removed and activated. It can be carried out by heating for 30 to 200 minutes at a temperature of 1,300 to 1,600 ℃ after the injection.

In addition, in the above step, the calcium carbonate constituting the shell may be divided into calcium oxide and carbon dioxide as follows by going through the firing process as described above.

Calcium carbonate (CaCO ₃ ) → Calcium oxide (CaO) + carbon dioxide (CO ₂ )

Next, the sintered shell granulated pulverized product may be second pulverized and then impurities are removed to prepare a fine shell pulverized product.

In the above step, the sintered shell granulated pulverized product may be pulverized using a ball mill or various known pulverizers, and in the step, the pulverized shell fine pulverized product is pulverized so that the particle size of the prepared shell fine pulverized material is 1 to 10 μm. I can.

In addition, in the above step, impurities such as heavy metals that may remain in the second crushed shell may be removed by second pulverizing the sintered shell granulated product and then rotating it in a rotating cylinder equipped with a magnet. Impurities such as heavy metals, which may be included in the second crushed shell, may be removed by inserting the second crushed shell into a rotating cylinder equipped with a magnet and rotating at a rotation speed of 500 to 1000 RPM for 10 to 20 minutes.

Next, it can be inoculated by spraying the lactic acid bacteria culture solution to the pulverized shell fine particles.

In the above step, the lactic acid bacteria culture solution may be sprayed at a weight ratio of 1 to 5 parts by weight relative to 100 parts by weight of the shell fine pulverized product, and the lactic acid bacteria may use a lactic acid strain isolated from kimchi, a fermented food. , As the lactic acid strain, Lactobacillus curvatus , Weissella viridescens , Lactobacillus plantarum , and Any one or more known lactic acid strains selected from the group consisting of Leuconostoc lactis may be used.

For example, in the above step, in order to prepare a lactic acid bacteria culture solution from kimchi, the pH of the medium is adjusted to 2.8-3.2 using 1.2N HCl, and then the lactic acid strain is separated from the kimchi, and the isolated lactic acid strain is MRS broth (Oxoid , England) at 37~39℃ for 20 to 25 hours, then diluted to 1×1.0 ⁸ to 5×1.0 ⁸ CFU/mL, and then centrifuged at 10,000 to 15,000 rpm for 10 to 15 minutes After separating only (supernatant), filtering the supernatant with a 0.45 μm syringe filter, lactic acid bacteria are diluted by mixing in a weight ratio of 1,000 to 2,000 parts by weight of sterilized distilled water with respect to 100 parts by weight of the filtered supernatant. A culture solution can be prepared.

Subsequently, the pulverized shellfish inoculated with the lactic acid bacteria culture solution may be fermented.

In the above step, the pulverized shell shell inoculated with the lactic acid bacteria culture medium is maintained at a temperature of 38 to 45° C. and a humidity of 60 to 65%, and then fermented for 5 to 10 days.

Next, the fermented shell fine pulverized product is washed, dried, and sterilized to prepare shell powder made of calcium powder.

In the above step, the fermented shell fine pulverized product may be washed with purified water and then subjected to drying and sterilization processes. The drying and sterilization processes are well-known technologies, so for convenience of explanation and the technical idea of the present invention. For clarity, detailed descriptions thereof will be omitted.

The peppermint extract may be prepared using leaves and stems of mint, for example, the peppermint extract prepared by the following method may be used.

In order to prepare the peppermint extract, first, the leaves and stems of peppermint of the same amount are collected, and sodium hydrogen carbonate (NaHCO ₃ ) having a concentration range of 1 to 3% by weight and a temperature of 33 to 37°C is dissolved in purified water. By washing for 5 minutes, foreign substances adhering to the leaves and stems of mint can be removed.

The peppermint (Mentha arvensis var piperascens) is a perennial perennial herb of the Lamiaceae family of a dicotyledonous plant, and is branched from the top by having a directionality in the plant itself and standing upright. The main ingredients of peppermint are alphapinene (+, -)), anisaldehyde, Daucosterol, Eugenol, Linalool, Menthone, (+ )-Neomenthol ((+)-Neomenthol).

These mints emit a refreshing and refreshing scent, and have bactericidal and antimicrobial action against microorganisms such as pathogenic fungi, E. coli, staphylococcus, etc. that cause eczema and scabies present in the skin or scalp.

In addition, peppermint has the effect of constricting the mucous membranes and blood vessels of the skin, paralyzing nerve peripherals, stopping pain, stopping itching, and so on, giving the skin a unique refreshing sensation, improving skin diseases, It is known to have an antioxidant effect, and menthol, which is the main component of mint, is medicated as a coating agent, pain reliever, stimulant, or drying agent, and is used as a flavoring or refreshing agent in toothpaste, candy, jam, cosmetics, and tobacco.

Next, the washed mint leaves and stems may be steamed with steam.

In the above step, the steaming may be performed by heating the washed leaves and stems of mint with water vapor at a temperature of 120 to 130°C at a pressure of 3 to 4kgf/cm ² for 30 to 40 minutes.

Then, the leaves and stems of the steamed mint can be dried.

In the above step, in order to prevent volatilization of chlorophyll or useful components of the leaves and stems of the mint leaves and stems during sunlight drying, the drying of the leaves and stems of the peppermint is 20 at a temperature of 15 to 20°C and a humidity of 55 to 60%. It can be dried for up to 30 hours.

Subsequently, the dried leaves and stems of mint may be heated to astringent and then cooled.

In the above step, the dried mint leaves and stems are first roasted at a temperature of 70 to 75°C for 3 to 5 minutes after putting the dried mint leaves and stems into a heating container, and the first roasted mint leaves and stems are 120 The second roasting for 10 to 40 seconds at a temperature of 130° C. may be performed by cooling the leaves and stems of the second roasted mint at a temperature of 20 to 30° C. for 30 to 60 minutes.

Next, the leaves and stems of peppermint cooled after the roasting may be extracted to prepare a peppermint extract.

In the above step, the leaves and stems of peppermint cooled after the roasting may be extracted using various extraction methods such as hot water extraction, organic solvent extraction, ultrasonic extraction, and supercritical extraction.

For example, the ultrasonic extraction method is an extraction solvent of distilled water, ethanol, methanol, butanol, acetone, ethyl acetate, hexane, propanol, hydrous butylene glycol, hydrous propylene glycol, 10 times more than one solvent selected from the group consisting of It refers to an extraction method performed using an ultrasonic extraction method of 1 hour to 10 hours, preferably 1 hour to 4 hours, after adding to 20 times the volume.

In addition, the supercritical extraction method refers to a dried and crushed sample and 500-700 mL of ethanol (99.5%) as a co-solvent, placed in a supercritical fluid extraction reactor (Natex, Autstria), and the temperature in the reactor is 65° C., the pressure is 450 bar, S It refers to a method of extracting under the conditions of 35 /F ratio (supercritical fluid kg/Feed kg).

The dispersant may be used to prevent precipitation of the primer composition and to have dispersion characteristics.For example, the dispersant may be a polyester-polydimethylsiloxane copolymer, dimethylol butanoic acid (DMBA), Any one or more selected from the group consisting of dimethylol propionic acid (DMPA) and methylenediethanolamine may be used.

Hereinafter, examples and comparative examples for the antibacterial film for food packaging according to the present invention will be described in more detail with reference to the accompanying drawings.

<Example 1>

An antibacterial film for food packaging was prepared by forming a first substrate, a second substrate, and a coating layer positioned between the first substrate and the second substrate.

At this time, the first and second substrates used a known polypropylene film, and the coating layer was 20 parts by weight of wasabi extract oil, 10 parts by weight of solvent, 15 parts by weight of self-emulsifying epoxy resin, and acrylic modified A coating solution composition mixed in a weight ratio of 7 parts by weight of a polyester resin, 2 parts by weight of a deodorant bead, and 0.5 parts by weight of a curing agent was applied and then dried to form.

<Example 2>

An antibacterial film for food packaging was prepared in the same manner as in Example 1, but in Example 2, a first primer layer was formed between the first substrate and the coating layer, and a second primer layer was further formed between the second substrate and the coating layer. Thus, an antibacterial film for food packaging was prepared.

At this time, the first and second primer layers are 50 parts by weight of a polyurethane acrylate oligomer, 30 parts by weight of an acrylic monomer, 2 parts by weight of a photocuring agent, 100 parts by weight of a solvent, and polyvinyl alcohol ( polyvinyl alcohol) 5 parts by weight, 3 parts by weight of gelite, 1 part by weight of shell powder, 2 parts by weight of peppermint extract, and 1.5 parts by weight of dispersant were applied and dried to form a mixed primer composition.

<Comparative Example>

After preparing a polypropylene film, it was used as a food packaging film according to a comparative example.

1. Antibacterial test

Prepare an antibacterial film specimen (5×5mm) for food packaging prepared as in Examples 1 and 2, and target the culture medium of Bacillus subtilis, Escherichiacli and Salmonella typhimurium disk) method was used to investigate antimicrobial activity, and the results are presented in Table 1 below.

division Antibacterial activity (antibacterial ring of paper disk, diameter mm) Bacillus Coli Salmonella Example 1 12.4 13.6 12.5 Example 2 12.6 13.5 13.1

Referring to [Table 1], it was confirmed that the antimicrobial film for food packaging prepared as in Examples 1 and 2 had excellent antibacterial activity against all of Bacillus, E.

2. Heavy metal content test

The heavy metal content of the antibacterial film for food packaging prepared according to Example 1 was measured, and the results are shown in FIG. 4.

5 is a test report showing the heavy metal content of the antimicrobial film for food packaging prepared according to the Example.

Referring to FIG. 5, it can be seen that the antimicrobial film for food packaging manufactured according to the embodiment has a heavy metal content of less than a reference value and is safe.

3. Food preservation test (fruit food)

Commercially available cherry tomatoes were packaged with films according to Examples 1 and 2 and Comparative Examples, and then stored in a thermostat at 20°C and 30°C for 3 days, 6 days, and 9 days, and then the degree of spoilage of cherry tomatoes was measured. It was observed with the naked eye, and the results are shown in Table 2 below.

At this time, the degree of corruption was visually checked, and "○" indicates a good state, "△" indicates a slightly corrupted state, and "X" indicates a "corrupted state".

division 3 days 6 days 9th 20℃ 30℃ 20℃ 30℃ 20℃ 30℃ Example 1 ○ ○ ○ ○ ○ △ Example 2 ○ ○ ○ ○ ○ △ Comparative example △ X X X X X

Referring to [Table 2], it can be seen that the antimicrobial film for food packaging prepared according to Examples 1 and 2 progresses the degree of spoilage of food very slowly, so that the freshness of the food can be maintained for a long time even if time elapses. have.

In the above, a preferred embodiment of the present invention has been described, but those of ordinary skill in the art to which the present invention pertains will understand that the present invention can be implemented in other specific forms without changing the technical spirit or essential features. I will be able to. Therefore, it should be understood that the exemplary embodiment described above is illustrative in all respects and is not limiting.

10; Antibacterial film for food packaging
100a; First description
100b; 2nd description
200a; First primer layer
200b; Second primer layer
300; Coating layer

Claims (3)

A first substrate 100a, a second substrate 100b, and a coating layer 300 positioned between the first substrate 100a and the second substrate 100b, and the first substrate 100a and the coating layer ( 300) comprising a first primer layer (200a) positioned between, and a second primer layer (200b) positioned between the second substrate (100b) and the coating layer (300),
Polypropylene film is used as the first substrate 100a and the second substrate 100b,
The coating layer 300 is prepared by mixing and then mixing a coating liquid composition in a certain weight ratio, and the coating liquid composition includes 10 to 30 parts by weight of wasabi extract oil, 5 to 15 parts by weight of solvent, and 10 to 20 parts by weight of a self-emulsifying epoxy resin. It is prepared by mixing in a weight ratio of 5 to 10 parts by weight of an acrylic-modified polyester resin, 1 to 3 parts by weight of a deodorant bead, and 0.1 to 1 parts by weight of a curing agent,
The wasabi extract oil is washed after preparing wasabi, steamed by steaming the washed wasabi for 30 to 60 minutes with steam, and washed the steamed wasabi with either acetic acid or citric acid. And, the acid-washed wasabi is dried for 10 to 30 hours at a temperature of 20 to 22° C. and a humidity of 55 to 60%, and the dried wasabi is extracted to prepare an oil,
The self-emulsifying epoxy resin is a self-emulsifying modified epoxy resin having an epoxy equivalent of 200 to 230 g/eq,
The acrylic-modified polyester resin is condensed and polymerized with a polybasic acid containing 40 to 50% by weight of anhydrous acid and 50 to 60% by weight of an aliphatic acid by condensation polymerization of a polyhydric alcohol containing 80 to 90% by weight of a diol and 10 to 20% by weight of a triol. To prepare a polyester resin having a value of 45 to 65 mgKOH/g, an acid value of 3 mgKOH/g or less, a glass transition temperature of 5 to 20°C, and a weight average molecular weight (Mw) of 2,500 to 3,500, and the polyester resin 50 to 60 weight % And 40-50% by weight of acrylic monomers are grafted to produce a weight average molecular weight (Mw) of 5,000-7,000, a hydroxyl value of 50-60 mgKOH/g, an acid value of 3 mgKOH/g or less, and a glass transition temperature of 10- Acrylic modified polyester resin in the range of 20°C is used,
The deodorizing bead is prepared in a mixed solution of 200 to 300 parts by weight of a water-soluble ethylenically unsaturated monomer, 30 to 50 parts by weight of a hydrophilic additive, and 10 to 20 parts by weight of a crosslinking agent, and based on 100 parts by weight of the total mixed solution After adding purified water in a weight ratio of 50 to 100 parts by weight, the mixture is stirred, and a polymerization initiator is added to the mixed solution of purified water to form a polymer, and the polymer is dried at a temperature of 135 to 145°C and then pulverized to have a particle diameter of 1000. To prepare a polymer powder of 2000 μm, and prepared by mixing in a weight ratio of 10 to 20 parts by weight of a deodorant solution based on 100 parts by weight of the total polymer powder,
The deodorant solution is sodium citrate 1 to 3 parts by weight, sodium lactate 2 to 4 parts by weight, glycerin 3 to 6 parts by weight, potassium chloride 0.5 to 1.5 parts by weight, sodium chloride 0.1 to 0.5 parts by weight, vitamin B1 lauryl sulfate 0.5 to 1.5 It is prepared by mixing in a weight ratio of 1 to 3 parts by weight of sodium benzoate, 0.5 to 1.5 parts by weight of grapefruit seed extract, 0.1 to 0.3 parts by weight of hwangchil tree leaf extract, and 5 to 10 parts by weight of purified water,
The hwangchil tree leaf extract is washed after preparing the hwangchil tree leaf, and the washed hwangchil tree leaf is pulverized so that the particle diameter is in the range of 500 to 2500 μm, and the solvent is 1000 to 100 parts by weight of the pulverized hwangchil tree leaf After preparing a mixture by mixing at a weight ratio of 2000 parts by weight, it was introduced into an ultrasonic extractor, and ultrasonic waves were applied to the mixture under a temperature of 20 to 25°C and a pressure of 0.1 to 0.5 kgf/cm ² , and solid content contained in the mixture It is manufactured through the process of removing
The curing agent is prepared by mixing a curing agent resin and a curing accelerator, and a modified aliphatic polyamine is used as the curing agent resin, 2,4,6-tridimethylaminomethyl phenol is used as the curing accelerator, and the curing agent resin 4 It is prepared by mixing in a weight ratio of to 8 parts by weight and 1 to 2 parts by weight of a curing accelerator,
The first primer layer (200a) and the second primer layer (200b) is a primer composition between the first substrate (100a) and the coating layer (300), respectively, between the second substrate (100b) and the coating layer (300). It is prepared by drying after application,
The primer composition includes 40 to 60 parts by weight of a polyurethane acrylate oligomer, 20 to 40 parts by weight of an acrylic monomer, 1 to 3 parts by weight of a photocuring agent, 80 to 120 parts by weight of a solvent, polyvinyl alcohol (polyvinyl alcohol). alcohol) 3 to 7 parts by weight, 2 to 4 parts by weight of gelite, 0.5 to 1.5 parts by weight of shell powder, 1 to 3 parts by weight of peppermint extract and 1 to 2 parts by weight of dispersant,
The shell powder is washed after preparing any one or more shells selected from the group consisting of abalone, oyster, conch, cockle, clams, petrified and shellfish to remove foreign substances adhering to the shell, and the washed shell is first Crushed to prepare a shell granulated pulverized product, and the shell granulated pulverized product is immersed in a mixture consisting of nitric acid, phosphate compound, persulfate, acetic acid and purified water, and the mixture of nitric acid, phosphate compound, persulfate, acetic acid and purified water Is composed of 0.1 to 0.5% by weight of nitric acid, 0.5 to 1.5% by weight of phosphate compound, 0.01 to 0.1% by weight of persulfate, 1 to 3% by weight of acetic acid, and the remaining amount of purified water, and the shell granulated pulverized product is used for 10 to 30 minutes. It is carried out by immersing in a mixed solution consisting of nitric acid, phosphate compound, persulfate, acetic acid and purified water, and the phosphate compounds include first sodium phosphate (NaH ₂ PO ₄ ), second sodium phosphate (Na ₂ HPO ₄ ), and tertiary phosphoric acid. Sodium (Na ₃ PO ₄ ), first potassium phosphate (KH ₂ PO ₄ ), second potassium phosphate (K ₂ HPO ₄ ), first ammonium phosphate ((NH ₄ ) H ₂ PO ₄ ), second ammonium phosphate ( (NH ₄ ) ₂ HPO ₄ ) and tertiary ammonium phosphate ((NH ₄ ) ₃ PO ₄ ) any one or more selected from the group consisting of is used, and the persulfate is ammonium persulfate ((NH ₄ ) ₂ S ₂ O ₈ ), sodium persulfate (Na ₂ S ₂ O ₈ ) and potassium persulfate (K ₂ O ₈ S ₂ ) Any one or more selected from the group consisting of is used, the immersed shell granulated pulverized product is nitric acid, phosphate compound , Persulfate, acetic acid, and purified water after separating and taking out the mixture, the shell granulated pulverized product is calcined by heating in a kiln at a temperature of 1,300 to 1,600°C for 30 to 200 minutes, and the calcined shell granulated pulverized product is second After pulverization, impurities are removed to prepare a fine shell pulverized product having a particle diameter of 1 to 10 µm, and oil based on 100 parts by weight of the fine shell pulverized product Inoculate by spraying at a weight ratio of 1 to 5 parts by weight of the acid bacteria culture solution, but the lactic acid bacteria culture solution adjusts the pH of the medium to 2.8 ~ 3.2 using 1.2N HCl, and then separates the lactic acid strain from kimchi, and the separated lactic acid strain MRS broth (Oxoid, England) was incubated for 20 to 25 hours at 37 to 39°C, and then diluted to 1×1.0 ⁸ to 5×1.0 ⁸ CFU/mL, and then 10 to 15 at 10,000 to 15,000 rpm. After centrifugation for minutes to separate only the supernatant, the supernatant was filtered through a 0.45 μm syringe filter, and then sterilized distilled water at a weight ratio of 1,000 to 2,000 parts by weight based on 100 parts by weight of the filtered supernatant. It is prepared through a process of mixing and dilution, and as the lactic acid strain, Lactobacillus curvatus , Weissella viridescens , Lactobacillus plantarum , and Any one or more lactic acid strains selected from the group consisting of Leuconostoc lactis are used, and the pulverized shell microparticles inoculated with the lactic acid bacteria culture solution are kept at a temperature of 38 to 45° C. and a humidity of 60 to 65%. After that, the shell powder is fermented for 5 to 10 days, and the fermented shell fine pulverized product is washed, dried, and sterilized.
The mint extract was washed with purified water in which sodium hydrogen carbonate (NaHCO ₃ ) having a concentration range of 1 to 3% by weight and a temperature of 33 to 37°C was dissolved by collecting the same amount of leaves and stems of mint, Remove foreign substances adhering to the leaves and stems of mint, and heat the washed mint leaves and stems with water vapor at a temperature of 120 to 130°C at a pressure of 3 to 4kgf/cm ² for 30 to 40 minutes to steam, The steamed mint leaves and stems are dried for 20 to 30 hours at a temperature of 15 to 20°C and a humidity of 55 to 60%, and the dried leaves and stems of peppermint are heated to astringent and then cooled, but the abrasion The dried mint leaves and stems are first roasted at a temperature of 70 to 75°C for 3 to 5 minutes after putting them into a heating container, and the leaves and stems of the first roasted mint are heated at a temperature of 120 to 130°C. In the second roasting for 10 to 40 seconds, the leaves and stems of the second roasted mint are cooled for 30 to 60 minutes at a temperature of 20 to 30 °C, and the leaves of mint cooled after the roasting and Antibacterial film for food packaging, characterized in that manufactured through the process of extracting the stem. delete delete

Images