KR102366918B1 - A Method for Producing a Functional Film for Anti Biotic and Anti Decaying Property - Google Patents

Abstract

The present invention relates to an antibacterial functional film for preventing decomposition. The antibacterial functional film for preventing decomposition comprises: a step of forming a primary film having antibacterial properties by mixing a powder component consisting of bentonite, zeolite, and potassium carbonate with a synthetic resin material; a step of forming a secondary film for blocking light by mixing a metal material and the synthetic resin material; a step of forming a tertiary film for a gas shut-off by a polyethylene terephthalate or nylon material; and a step of forming a multilayer film by the primary, secondary, and tertiary films. Therefore, the present invention is capable of maintaining the freshness of food for a long time.

Description

A method for producing a functional film for antibacterial and anti-corruption {A Method for Producing a Functional Film for Anti Biotic and Anti Decaying Property}

The present invention relates to a functional film for antibacterial and anti-corruption, and specifically, to a method for manufacturing an antibacterial and anti-corruption functional film that allows stored food to be stably stored by antibacterial properties and external gas inflow blocking properties.

Research and development of various kinds of chemical or physical methods for maintaining freshness or taste in food storage or storage process are being conducted. For example, antibacterial films made in the form of films by adding antibacterial agents or ingredients for maintaining freshness to various types of synthetic resin materials are used as packaging paper or other materials. Patent Registration No. 10-2229068, which corresponds to the related prior art, discloses a multilayer antibacterial film for packaging. In addition, Patent Registration No. 10-2212462 discloses an eco-friendly copper powder antibacterial film using TPU. A packaging film for food or similar products requiring freshness maintenance has antibacterial properties to prevent spoilage, while at the same time preventing the inflow of gases such as oxygen from the outside, it is necessary to have a property that can block the inflow of light as needed there is However, the prior art does not disclose a functional film having such properties.

The present invention is to solve the problems of the prior art and has the following objects.

Prior Art 1: Patent Registration No. 10-2229068 (Domin Enterprise Co., Ltd., Announcement on March 19, 2021) Multi-layered antibacterial film for packaging Prior art 2: Patent Registration No. 10-2212462 (Bummin Chemical Co., Ltd., announced on Feb. 8, 2021) Eco-friendly copper powder antibacterial film using TPU

It is an object of the present invention to provide a method for manufacturing an antibacterial and anti-corruption functional film that has antibacterial properties and prevents the inflow of gas from the outside to maintain freshness while having antibacterial properties.

According to a suitable embodiment of the present invention, the antibacterial and anti-corruption functional film is formed by mixing a powder component consisting of bentonite, zeolite and potassium carbonate with a synthetic resin material to form a primary film having antibacterial properties; forming a secondary film for blocking light by mixing a metal material and a synthetic resin material; Forming a tertiary film for gas barrier by using polyethylene terephthalate or nylon material; and forming a multilayer film by the first, second and tertiary films.

According to another suitable embodiment of the present invention, it further comprises the step of low-temperature aging the powder component in an antibacterial solution containing a phytoncide solution.

According to another suitable embodiment of the present invention, the synthetic resin material is low-density polyethylene (LDPE) or linear low-density polyethylene (LDPE).

The functional film manufactured by the method for manufacturing the anti-corruption functional film of the present invention has an antibacterial function due to the multilayer film structure and at the same time blocks the inflow of gas so that food freshness is maintained for a long period of time. In addition, the functional film according to the present invention prevents the inflow of electromagnetic waves according to the incident light from entering the package. The functional film prepared according to the present invention may be used for various purposes including food packaging, and the present invention is not limited thereby.

1 shows an embodiment of a method of manufacturing an antibacterial and anti-corruption functional film according to the present invention.

Hereinafter, the present invention will be described in detail with reference to the embodiments shown in the accompanying drawings, but the embodiments are for a clear understanding of the present invention, and the present invention is not limited thereto. In the following description, components having the same reference numerals in different drawings have similar functions, so unless necessary for the understanding of the invention, the description will not be repeated and well-known components will be briefly described or omitted, but the present invention It should not be construed as being excluded from the embodiment of

1 shows an embodiment of the antibacterial and anti-corruption functional film according to the present invention.

Referring to Figure 1, the method for producing a functional film for antibacterial and anti-corruption comprises the steps of mixing a powder component made of bentonite, zeolite and potassium carbonate with a synthetic resin material to form a primary film having antibacterial properties (P11); Forming a secondary film for light blocking by mixing a metal material and a synthetic resin material (P12); Forming a tertiary film for gas barrier by polyethylene terephthalate or nylon material (P13); and forming a multilayer film by the first, second and tertiary films (P14).

Bentonite may be a clay mineral whose main component is montmorillonite, and may be Na-montmorillonite, Ca-montmorillonite, hectorite or siphonite, but Ca-montmorillonite exhibiting deodorizing properties while having hygroscopicity by high-temperature treatment can be a count Since Ca-bentonite has different deodorizing properties depending on pH, it may be selectively treated such that the pH of Ca-bentonite is 6.7 to 7.2, but is not limited thereto. The zeolite may be various types of zeolites having the ability to remove gas components while absorbing moisture. For example, the zeolite may be a zeolite having a polyhedral structure including Si, Al, Na or K. Since zeolite has different water absorption and gas removal capabilities depending on the size or specific surface area of the pores, the zeolite needs to be selected based on this. For example, the zeolite has an average specific surface area of 20 to 800 m ² /g; average pore surface area of 1.0 to 720 m ² /g; and an average pore diameter of 0.2 to 0.8 nm, but is not limited thereto. Calcium carbonate may have a gas adsorption function as it becomes a filling material and is subjected to high-temperature treatment. Bentonite, zeolite and calcium carbonate may each be made in powder form, for example, may be made in powder form to have an average diameter of 100 nm to 50 μm. Each material made in powder form may be mixed and heat-treated at a temperature of 900 to 1500 °C for 15 to 40 hours. The mixing ratio of the material may be bentonite: zeolite: calcium carbonate = 100: 80 to 120: 40 to 60 by weight ratio, but is not limited thereto. When the heat treatment powder component is prepared, an antibacterial solution may be prepared. The antibacterial solution may be, for example, a mixed component of the wood vinegar liquid and the phytoncide liquid, and the wood vinegar liquid may be moisture generated when smoke comes into contact with air in the process of making charcoal, for example, in the process of burning wood, and oak wood. It may be generated during the combustion process, but is not limited thereto. The grass liquor may contain organic acids contained in trees such as oak, for example, an alcohol component, a phenol component, a carbonyl group, a furan component, or a similar aromatic compound component. Can produce weak acid. Since wood vinegar may exhibit toxicity, impurities are removed through purification and filtration, for example, it needs to be used in a state of being aged for 1 to 10 months at a temperature of 5 to 25 °C. Wood vinegar liquid and phytoncide liquid may be mixed in a weight ratio of wood vinegar liquid: phytocide liquid = 100: 80 to 120 to form an antibacterial solution. When such an antibacterial solution is prepared, the heat treatment powder component may be aged by the antibacterial solution. For aging, an antibacterial solution may be absorbed into the heat-treated powder component by a spray method or other suitable method. For example, 5 to 30 wt% of the antibacterial solution may be added based on 100 wt% of the heat-treated powder component, and the aging may be performed at a temperature of 0 to 30 °C for 15 to 48 hours. After aging in this way, it is heated at a temperature of 800 to 1,200° C. for 18 to 48 hours to remove the remaining moisture component. In this way, the antibacterial component can be absorbed into the internal pores of the heat treatment powder component to exhibit an antibacterial function. Such an aged powder component may be mixed with a synthetic resin component to form a primary film.

For the formation of the primary film, for example, low density polyethylene (Low Density Polyethylene) and linear low density polyethylene (Linear Low Density Polyethylene) may be prepared and pulverized, and LDPE and LLDPE are LDPE: LLDPE = 100: 20 to 80 can be, but is not limited to. LDPE and LLDPE can be pulverized to have an average diameter of 100 nm to 50 μm, and can be pulverized to a uniform particle size through two or more pulverization operations. When the base powder of the synthetic resin material is prepared in this way, the base powder and the aged powder may be mixed. For example, the aged powder and the base powder may be mixed in a weight ratio of aged powder: base powder = 100: 120 to 200. The mixed primary film material can be uniformly mixed in the mixing device. When the primary film material is uniformly mixed in the compounding device, the extrusion device may be extruded while maintaining the average temperature at 120 to 180° C. in the extrusion device, and a master batch chip of a pellet or similar shape may be made. A primary film may be made from the master batch chip made in this way, for example, a primary film having a thickness of 0.05 to 5 mm may be made (P11).

When the primary film is prepared, a secondary film for blocking the inflow of light or electromagnetic waves according to the inflow of light may be made (P12). The secondary film may include a metal material for blocking light or electromagnetic waves, for example, aluminum, titanium oxide, aluminum oxide, or similar metal or metal oxide. Such a blocking metal may be made in a powder form, for example, may be made in a powder form having an average diameter of 10 nm to 10 μm. LDPE is prepared in the same or similar manner as LDPE for the production of the primary film, and a barrier powder may be mixed into the LDPE powder. The barrier powder can be made into a barrier film material by adding 0.01 to 10 wt% based on 100 wt% of the LDPE powder in a weight ratio, and the barrier film material is a secondary barrier material through the same or similar method as the primary film manufacturing method It can be made of film (P12). The secondary barrier film may be made to have the same or similar thickness as the primary antibacterial film, but is not limited thereto. When the secondary film is prepared in this way (P12), a tertiary protective film made of polyethylene terephthalate (PET) or nylon may be made. The tertiary protective film made of PET or nylon may have the same or similar thickness as the primary film, and may have a structure that blocks the inflow of gas from the outside (P13). When the first, second, and tertiary films are made, the three films can be combined to form a layer to become a functional film (P14). The functional film made in this way may be used as a food storage zipper bag or a packaging film. In the functional film, the primary film may have an antibacterial or deodorizing function, and may additionally have a function of removing perishable gas or spoilage-inducing gas generated from food. The secondary film may have a function of blocking the inflow of light or electromagnetic waves, and the tertiary film may have a function of blocking the inflow of gas from the outside. As described above, the freshness of the food is maintained by the adsorption of the decaying gas by the primary film and the blocking of the external gas by the secondary and tertiary films. An embodiment of a method for manufacturing a functional film will be described below.

Example

go. Preparation of primary antibacterial film

- Bentonite, zeolite, and potassium carbonate were prepared in powder form, and prepared to be 400 g, 400 g and 200 g, respectively. The prepared powder was heated at a temperature of 1,000 °C for 24 hours to remove impurities inside and made into an antibacterial powder.

- As the phytoncide liquid obtained from cypress and pine was prepared, the herbal liquid was prepared from oak charcoal. Phytoncide liquid and wood vinegar liquid were each mixed in an amount of 50 g to make an adsorption solution, and the adsorption solution was added to the antibacterial powder and aged at a temperature of 10 °C for 24 hours. After that, the low-temperature aging antibacterial powder was heated at a temperature of 1,000 °C for 24 hours to remove moisture.

- 7,000 g and 3,000 g of LDPE and LLDPE were prepared and mixed, and it was made into a powdery base material through two pulverization processes, and the mixing was carried out in the mixing device so that the weight ratio of antibacterial powder: base material = 40: 60 became The blended material was made into a master batch chip in the form of pellets by a compression device maintained at a temperature of 140 ° C. and a primary film having a thickness of 0.5 mm.

me. Preparation of secondary barrier film

- A secondary film having a thickness of 0.5 mm was made by preparing LDPE and aluminum oxide, making it into powder, and mixing it to make the primary film.

all. Preparation of tertiary protective film and production of functional film

- A tertiary protective film having a thickness of 0.5 mm was made from a PET material, and a functional film was manufactured by bonding to form a layer with the primary and secondary films made above.

efficacy test

go. antibacterial test

An antibacterial test was performed on the prepared functional film according to the KFIA-FI-1002 test method, and staphylococcus aureus ATCC 6538 (strain 1) and salmonella enterica ATCC 10708 (strain 2) were used as strains. became And the test results are presented in Table 1.

initial concentration
(CFC/ml) concentration after 24 hours
(CFC/ml) strain 1 Example 6.2×10 ⁵ 2.0×10 ³ or less blank 4.8×10 ⁵ strain 2 Example 1.5×10 ⁵ 1.0×10 ³ or less blank 1.3×10 ⁵

me. deodorization test

A deodorization test was carried out according to the KFIA-FI-1004 test method for the prepared functional film, ammonia was used as a test gas, and the test results are presented in Table 2.

Test Items Elapsed time (minutes) Blank concentration (ppm) Sample concentration (ppm) Deodorization rate (%) ammonia
deodorization test 0 600 600 - 30 580 250 61% 60 560 210 65% 90 520 190 68% 120 495 175 70%

all. freshness test

The freshness was measured by the prepared functional film, and the freshness was stored at a temperature of 5 ° C for 0 to 20 days by storing the meat inside the container, sealing the open upper side with a functional film and a general sealing film (control). It was measured with a meter (Torry Meter). The measured value may range from 1 to 16, and the higher the freshness, the greater the value.

storage duration 0 (days) 1 day) 3 days) 7 days) 10 days) 20 (Sun) Example 14.56 13.54 12.11 11.69 10.58 9.25 control 14.56 8.64 6.56 5.45 4.95 4.11

As can be seen from Table 3, it can be seen that the food freshness is maintained for a long time by the functional film.

Although the present invention has been described in detail with reference to the presented embodiment, those skilled in the art will be able to make various modifications and variations of the invention without departing from the technical spirit of the present invention with reference to the presented embodiment. . The present invention is not limited by such variations and modifications, but only by the claims appended hereto.

P11: antibacterial primary film
P12: light transmission prevention secondary film
P13: Airframe protective tertiary film
P14: Multilayer film formation

Claims (3)

Forming a primary film having antibacterial properties by mixing a powder component consisting of bentonite, zeolite and potassium carbonate with a synthetic resin material;
forming a secondary film for blocking light by mixing a metal material and a synthetic resin material;
Forming a tertiary film for gas barrier by using polyethylene terephthalate or nylon material; and
Comprising the step of forming a multilayer film by the first, second and tertiary films,
Further comprising the step of aging the powder component consisting of bentonite, zeolite and potassium carbonate at a low temperature in an antibacterial solution containing a phytoncide solution,
The synthetic resin material is low-density polyethylene (LDPE) and linear low-density polyethylene (LLDPE), and LDPE and LLDPE are 100: 20 to 80 in weight ratio. delete delete

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