KR20220161024A - Package containg TiO2 and carbon quantum dot - Google Patents

Abstract

The present invention relates to a packaging material composed of TiO_2 and a carbon quantum dot. The packaging material composed of TiO2 and the carbon quantum dot of the present invention comprises the carbon quantum dot and TiO_2 and has antibacterial properties, and is not harmful to a human body. The packaging material is a food packaging material, a film, a wrap, a vinyl or a hard case.

Description

Package containing TiO2 and carbon quantum dot {Package containing TiO2 and carbon quantum dot}

The present invention relates to a packaging material composed of TiO ₂ and carbon quantum dots (Carbon Quantum Dot), and more particularly, to a packaging material containing TiO ₂ and carbon quantum dots that has antibacterial properties and is not harmful to the human body, and the packaging material is for food It relates to a packaging material, film, wrap, vinyl or hard case.

Since food has a great influence on human life and life, preservation of quality is very important, and for this purpose, the role and function of food packaging are important.

For this reason, food packaging materials are required to have a function to prevent proliferation of harmful microorganisms in order to prevent deterioration of food, and shock absorption properties are required due to the characteristics of distribution and storage processes. In addition, in the manufacturing process, the conditions of thermal adhesion, heat resistance, and transparency must be satisfied. Therefore, while preventing damage to the contents, excellent appearance should be considered in consideration of displayability of the product.

On the other hand, polymer nanocomposite technology can be selected as a technology that can be applied in food packaging. Polymer nanocomposite refers to a form in which a nano-sized material having functionality is put into a polymer and extruded onto a film to laminate nanoparticles.

Although silver nanoparticles have been added in order to have antibacterial properties of food packaging materials that meet these expectations, silver nanoparticles cause agglomeration in the synthetic resin melt, resulting in weakened dispersibility and reduced antibacterial function.

In order to solve this problem, Registered Patent No. 10-1004027 discloses a technology of replacing silver nanoparticles with silica nanotubes to improve the weakened dispersion. remain in it, resulting in toxicity. In addition, as a result of applying silver nanoparticles, which are widely used in consumer products, to experimental animals, it was confirmed that they were toxic, and in particular, it was found that the brain and testicles did not discharge well.

Accordingly, the present invention is intended to disclose a packaging film capable of exhibiting antibacterial activity without being harmful to the human body.

Korean Patent Registration No. 10-1300645 (registration date: 2013.08.21) relates to an antibacterial food packaging wrap containing silver nanoparticles-containing silica nanotubes, containing silver nanoparticles-containing silica nanotubes to have antibacterial properties , It is characterized in that water-repellent nano-silica on the surface of the film prevents blurring caused by water droplets. Korean Patent Registration No. 10-1802362 (registration date: 2017.11.22) relates to an extruded foam sheet and foam molded foam having antibacterial properties, and a biodegradable foam sheet made of polylactic acid or containing polylactic acid as a main material for biodegradability It is characterized by being eco-friendly and having antibacterial properties by containing an inorganic antibacterial agent. Republic of Korea Patent Registration No. 10-1713249 (registration date: 2017.02.28) relates to a food packaging film having antibacterial and deodorizing functions and a method for manufacturing the same, and more specifically, aluminum oxide, silicon dioxide, etc. By manufacturing a film by adding bentonite, it prevents discoloration of the film and emits a large amount of far-infrared rays, so it has excellent antibacterial and deodorizing power, so that it can maintain a long shelf life when packaging fresh foods such as processed foods or vegetables It provides a food packaging film having antibacterial and deodorizing functions and a manufacturing method thereof. Korean Patent Registration No. 10-1004027 (registration date: 2010.12.31) relates to an antibacterial food packaging film, characterized by adding silica nanotubes adsorbing silver nanoparticles with excellent dispersion in a synthetic resin solution. It is a food packaging film. The invention according to this is characterized in that the silica nanotubes containing silver nanoparticles are uniformly dispersed in the food packaging film, so that the antibacterial function is superior to that of conventional antibacterial films.

The published paper 'Antibacterial Food Packaging: Application of Antimicrobial Substances in Food Packaging' (Journal of the Korean Packaging Society, 2005, pp.101 - 107, Dongsoo Cha and 2 others) is about the application method of antibacterial substances in food packaging, More specifically, organic acids and their salts, EDTA, chelating agents, antifungal agents such as Imazalil, enzymes, bacteriocins, essential oils, chitin, and chitosan were cited as antibacterial substances, and outer packaging containing these antibacterial substances It is about being able to lower the deterioration rate of.

The present invention relates to a packaging material that is harmless to the human body and has antibacterial properties, including TiO ₂ and carbon quantum dots.

The present invention provides an antimicrobial packaging material comprising TiO ₂ and carbon quantum dots.

In addition, the present invention provides an antibacterial packaging material characterized in that the antibacterial wrap, vinyl or film comprising a composition comprising TiO ₂ and carbon quantum dots.

In addition, the present invention provides an antibacterial packaging material characterized in that the hard case characterized in that the composition comprising TiO ₂ and carbon quantum dots.

In addition, the present invention provides an antibacterial packaging material characterized in that the food packaging material characterized in that the composition comprising TiO ₂ and carbon quantum dots.

The antibacterial packaging material, characterized in that it is composed of TiO ₂ and carbon quantum dots of the present invention, has excellent antibacterial properties, high stability, and no harm to the human body.

The packaging film of the present invention is intended to manufacture a packaging film with enhanced antibacterial properties by applying a material composed of TiO ₂ and carbon quantum dots as an antibacterial material.

Pure TiO ₂ has an excellent ability to absorb light and oxidize other substances, so it has a great antibacterial effect, removes odor and sterilizes. In addition, there is a great advantage of having non-toxicity that does not affect living organisms. For this reason, TiO2 is generally used in sunscreens, cosmetics, paints, photocatalysts, antibacterial agents, semiconductors, and solar cells.

Carbon quantum dots differ slightly depending on the synthesis process, but most of them have a lot of hydrophilic functional groups such as hydroxyl or carboxylic acid groups on the surface, so they show very good water solubility and unlike carbon nanomaterials such as existing carbon nanotubes or graphene. Its great advantage is that it does not present problems with solvent dispersion stability.

In addition, carbon quantum dots show little biotoxicity. It has been reported that cytotoxicity does not appear after the formation of carbon quantum dots even when raw materials exhibiting slight biotoxicity are used.

An example of the excellent biocompatibility of carbon quantum dots is the fact that carbon quantum dots are already present in significant quantities in many foods and beverages that we eat and drink every day. Recent studies have revealed that several percent of carbon quantum dots are present in foods and beverages when a large amount of carbohydrates and proteins are present in the raw materials of food and beverages, and when high temperature and high pressure treatment is involved in the cooking process.

When applied to food packaging materials using these TiO ₂ and carbon quantum dot compositions, it is very easy to express antibacterial properties in packaging materials such as packaging films, packaging containers, packaging wraps, vinyl, and films in daily stores or refrigerators with visible light.

Accordingly, the present invention provides an antibacterial packaging material comprising TiO ₂ and carbon quantum dots.

Meanwhile, the antibacterial packaging material may be preferably one of wrap, vinyl, film, hard case, food packaging material, foam, pad, and packaging container.

The packaging material synthesis process of the present invention is a. carbon quantum dot synthesis process b. The process of dispersing the synthesized carbon quantum dots and TiO ₂ in an aqueous polymer solution c. The drying process, which consists of three processes.

In the carbon quantum dot synthesis method of the present invention, a liquid hydrocarbon aqueous solution is synthesized in a high-pressure reactor.

On the other hand, the liquid hydrocarbon is acetone, benzene, ethylbenzene, toluene, ethanol, methanol, propanol, isopropyl alcohol, isopropyl ether, ethyl acetate, butanol, heptane, nonane, decane, undecane, dodecane, octane, pentane ol, cyclopentane, cyclohexane, hexane, phenol, pyrrole, oleic acid, acetic acid, xylene, styrene, dimethylformamide, dimethylsulfur monoxide, pyridine, diethyl ether, tetrahydrofuran, formamide, benzonitrile, It preferably contains at least one selected from triethylamine, tetralin, benzyl alcohol, butyl acetate, anisole, benzonitrile, trichlorethylene, and dibutyl ether.

In addition, the synthesis process is preferably performed in a high-pressure reactor at a temperature of 100° C. to 200° C. until the carbon quantum dots are synthesized.

Meanwhile, a step of filtering the synthesized product is further included. For example, the synthesized product is purified by first filtration of large-sized products using a membrane filter, dialysis of the filtrate for 12 hours using a 1000 Da dialysis membrane, and final filtration using a membrane filter again. Thus, synthesized carbon quantum dots can be obtained.

Then, a process of dispersing carbon quantum dots and TiO ₂ in an aqueous polymer solution is performed.

On the other hand, the polymer aqueous solution is polyvinyl alcohol (PVA), ethylene vinyl alcohol copolymer (EVOH), polyacrylate (polyacrylate), polylactic acid (PLA), polyglycolic acid (PGA), polycaprolactone (PCL), poly Hydroxybutyric acid (PHB), Poly methyl methacrylate, Polyvinylpyrrolidone, Polyethylene glycol, Polydimethylsiloxane, Polyacrylic acid, Polystyrene (Polystyrene) and polyethylene glycol (Polyethylene glycol).

In addition, in the dispersing step, it is preferable to add 10 to 30 wt% of the carbon quantum dots based on the total weight of the polymer aqueous solution. When using a high wt% of carbon quantum dots, the transparency of the film is lowered. In the case of TiO ₂ , it is preferable to add 0.05 wt% to 1 wt% based on the total weight of the polymer aqueous solution.

After completing the dispersing step, a drying step is performed.

On the other hand, the drying step is preferably carried out at a temperature of 80 to 100 ℃ for one day or more.

Through this, it is possible to make a film having excellent antibacterial properties and no harm to the human body.

Hereinafter, the contents of the present invention will be described in more detail through the following examples. However, the scope of the present invention is not limited only to the following examples, and includes modifications of equivalent technical ideas.

[Example 1: Film synthesis process]

a. Carbon quantum dot synthesis process

Acetone (20 mL) and distilled water (20 mL) were introduced into the beaker and stirred for 30 minutes using a magnetic stirrer. The mixed solution was then transferred into a stainless-steel autoclave with a Teflon liner (80 mL capacity and 50% filling), heated to 150 °C at a rate of 2 °C/min, and maintained under magnetic stirring at 200 rpm for 10 hours.

After completion of the reaction, the high-pressure reactor was slowly cooled to 25° C., and the solution was filtered using a 0.2 μm membrane filter to remove large aggregates.

Next, the synthesized product was purified for 24 hours using a 1000 Da dialysis membrane (molecular weight cutoff 1000 Da). Thereafter, synthesized carbon quantum dots were obtained by filtration using a 0.2 μm membrane filter.

b. synthesized carbon quantum dots and TiO ₂ The process of dispersing in a polymer aqueous solution

After introducing 1.0 g of polyvinyl alcohol (PVA, MW = 1500 g/mol) powder into 20 mL of distilled water, the mixture was vigorously stirred at 90° C. using a magnetic stirrer until a transparent solution was obtained, and then cooled to room temperature.

Then, an appropriate amount of PVA solution was poured into 4 beakers, and carbon quantum dots according to the 'carbon quantum dot synthesis process' were added to the PVA solution in different amounts (10, 20, 30 wt%), and TiO ₂ was added to 0.5 wt%. added. The mixture was stirred for 1 hour to prepare homogeneous solutions in which carbon quantum dots were dispersed.

c. drying process

Thereafter, the homogeneous solution was applied to a Petri dish using a pipette, and then dried at 90° C. for one day to prepare a high-quality, transparent and flexible film containing carbon quantum dots.

Claims (4)

An antibacterial packaging material comprising TiO ₂ and carbon quantum dots.
According to claim 1,
The antibacterial packaging material,
Antibacterial packaging material, characterized in that the wrap, vinyl or film.
According to claim 1,
The packaging material,
Antibacterial packaging material, characterized in that the hard case.
According to claim 1,
The antibacterial packaging material,
Antibacterial packaging material, characterized in that the packaging material for food.