KR100554378B1 - Starch vessel composition have a sterilization, deodorization, preservation character - Google Patents

Abstract

The present invention relates to a biodegradable starch container composition imparting sterilization, deodorization and preservation, and relates to a starch container composition for improving sterilization, deodorization function and preservation of a container manufactured by molding a biodegradable composition.

The starch container composition of the present invention for realizing this is prepared by mixing a composition composed of 25 to 65% by weight of modified or unmodified starch and 30 to 70% by weight of water as a main material, and then molding by heating and pressing molding machine. In the disposable starch container, the container composition contains 0.1 to 10% by weight of a photocatalyst for sterilization and deodorization, 0.001 to 20% by weight of a preservative, and 1 to 25% of fiber having a length of 0.5 to 7 mm as a tensile strength reinforcing agent. %, The release agent is characterized by consisting of 0.01 to 5% by weight.

Starch container, photocatalyst, composition, titanium dioxide, biodegradability, preservation, sterilization, deodorization

Description

Biodegradable starch container composition with sterilization, deodorization, and preservation {STARCH VESSEL COMPOSITION HAVE A STERILIZATION, DEODORIZATION, PRESERVATION CHARACTER}

1 is an expression mechanism for explaining the photocatalyst expression principle of the present invention.

2 is a photocatalytic reactor system for demonstrating the deodorizing effect of the composition of the present invention.

The present invention relates to a disposable starch container composition, and more particularly, when embedded in soil sterilization in consideration of the expiration date of food in the manufacture of starch containers that are naturally decomposed by microorganisms within a short period of time does not cause environmental pollution, The present invention relates to a starch container composition for improving deodorization as well as container retention.

Disposable containers used in general are products made of foamed synthetic resin, plastic, silver foil, etc., and their usage is increasing every year due to changes in diet and convenience of use due to an increase in income level. Environmental pollution is on the rise.

In particular, the disposable moldings discarded after use not only cause soil pollution because they are left in nature without being rotted by microorganisms, and when incinerated, they generate a large amount of air pollutants such as dioxins that are harmful to the human body. Known.

Therefore, in order to replace disposable moldings using synthetic resins, biodegradable disposable moldings using paper or natural polymers are currently being developed and partially applied to food packaging.

In the case of a disposable molded article manufactured by the conventional composition technology regarding such a biodegradable disposable container or a disposable container for food packaging made of paper or natural polymer, the inside of the container is made of Escherichia coli, O-157 bacteria, Pseudomonas aeruginosa, Staphylococcus aureus, Salmonella, etc. Or there is a concern that the outside may be contaminated, and may be a problem even in the long-term distribution.

In addition, starch-based disposable moldings manufactured according to the prior art were placed in a constant temperature and humidity chamber with a temperature of 40 ° C. and a relative humidity of 90% and tested for long-term storage of the container. It was confirmed that the polymer-containing biodegradable moldings were decayed.

Therefore, there is a problem in applying the biodegradable container proposed by the prior art when the long-term storage capacity of the container is weak and particularly when food such as ramen is stored and distributed in the container.

The present invention has been proposed to improve the above-mentioned conventional problems, and provides a photocatalyst-containing biodegradable starch molding having a sterilizing and deodorizing function in order to prevent the transfer of pathogenic bacteria into foods through disposable containers and containers by pathogenic bacteria. The purpose is to make it.

In addition, the present invention aims to improve the long-term preservation of products that require long-term distribution and storage, such as cup noodles by preventing the starch container from being decayed by microorganisms for more than several months in the actual distribution environment.

In addition, another object of the present invention is to be able to decompose in a natural state when the used container in large quantities in nature, as well as to be able to express the soil purification and atmospheric purification function by the photocatalytic action of the container composition.

The purpose is to mix the composition composed of 25 to 65% by weight of modified or non-modified starch and 30 to 70% by weight of water as a main material, and then injected into a heat press molding machine heated to 140 ~ 220 ℃ 0.5 ~ In the disposable starch container manufactured by molding for 20 seconds to 5 minutes at a pressure of 8kgf / ㎠, the container composition to be mixed is 0.1 to 10% by weight photocatalyst for sterilization and deodorization, 0.001 to 20% by weight preservative , 1 to 25% by weight of the fiber as a tensile strength reinforcing agent, 0.01 to 5% by weight of the release agent, it can be achieved through the biodegradable starch container composition imparted sterilization, deodorization, preservation characterized in that it comprises.

In general, when the photocatalyst-containing starch molding is irradiated with ultraviolet rays (UV) in the 300-400 nm region emitted by sunlight or fluorescent lamps, electrons are generated on the photocatalyst surface exposed to the starch molding surface, and holes are generated at the sites where the electrons are generated. These electrons and holes each react with oxygen or moisture in the atmosphere to produce free radicals and OH radicals. They are known to decompose organic matter into carbon dioxide (CO ₂ ) or water (H ₂ 0), which are harmless to the human body through reaction with organic substances harmful to the human body (see FIG. 1).

Therefore, in the present invention, it is possible to prevent the disposable container for food packaging from being contaminated by pathogenic bacteria using this photocatalyst principle, thereby improving the hygiene state of the disposable container.

In addition, in the case of products requiring long-term distribution and storage can be prevented for a certain period of time by the addition of a preservative to the microorganisms in the container can improve the long-term storage of the product in the actual distribution environment.

Hereinafter, a specific embodiment of the present invention will be described.

Starch used in the manufacture of starch containers with improved sterilization and deodorization and container preservation according to the present embodiment is generally corn, waxy corn, potatoes, tapioca, sweet potato, rice, glutinous rice, wheat, etc. having an amylose content of 40% or less. In addition to the natural unmodified starch, starch acetate, octenyl zucchini starch, acid treated starch, adipic acetate starch, ether starch, ester starch and the like modified by physical, chemical or biological methods may be used alone or in combination.

The photocatalyst is mixed in order to have sterilization and deodorization function in the starch (25 to 65 wt% based on the total weight of the mixture). At this time, the added photocatalyst is titanium dioxide having anatase content of 70 wt% or more, or iron [Fe]. (III)], titanium dioxide to which metals such as vanadium (V), molybdenum (Mo), niobium (Nb), and platinum (Pt) are added, or silicon dioxide (SiO ₂ ), vanadium pentoxide (V ₂ O ₅ ), Titanium dioxide metal oxides to which metal oxides such as tungsten oxide (WO ₃ ) are added are mixed alone or mixed at 0.1 to 10% by weight based on the total weight of the mixture, and sorbic acid and parahydroxy as a preservative to improve the preservation of starch moldings. Benzoic acid ester, propionate, sodium chloride 0.001 ~ 20% by weight, reinforcing agent to increase the elongation, tensile strength and flexural strength of starch moldings. 1-2 based on weight of mixture 5% by weight, 0.01 ~ 5% by weight of copper and vegetable curing oil, liquid paraffin, stearic acid, etc., and 30 ~ 70% by weight of 70 ~ 100 ℃ of water in the total mixture. It is preferable to add and mix.

 The photocatalyst is advantageous to reduce the bacterial contamination as the amount added, but when added in excess of 10% by weight may reduce the moldability and strength of the container, it is preferably added at 0.1 to 10% by weight.

In addition, additives which are optionally mixed include 0-5 wt% of the softener and the emulsifier sorbitan fatty acid ester, propylene glycol fatty acid ester, glycerin fatty acid ester, and polyglycerol fatty acid ester on the basis of the total weight of the mixture, and polyvinyl alcohol 0 as a plasticizer. ~ 15% by weight, 0 ~ 5% by weight of guar gum, gum arabic, karaya gum, xanthan gum, and xanthan gum as a stabilizer to improve emulsification stability. May optionally be added.

The biodegradable starch container was manufactured by molding the mixed starch mixture as described above for 20 seconds to 5 minutes at a pressure of 0.5 to 8 kgf / ㎠ using a heating press molding machine heated to 140 to 220 ° C., and the composition and content of the starch container were different. Experimental examples and comparative examples are as shown in the following [Table 1] to [Table 4], respectively.

The compositions according to the examples and the comparative examples were molded into containers, and then divided into four aspects, such as formability, strength, flexibility, and container preservation. As a result, the results shown in [Table 5] were obtained.

(◎: Very good, 0: Relatively good, △: Normal, ×: Poor)

As can be seen from the above results, Examples 4, 8, 9, and 10 of the various compositions showed very good results over the entire evaluation items, and when viewed in terms of container storage, a thermo-hygrostat with a temperature of 40 ° C. and a relative humidity of 90% Molding according to each composition in the test was tested for the degree of contamination of the container by the mold, most other compositions were caused by mold within 7 days, in Examples 1, 3, 5 in 21 to 30 days In the mold, especially in Example 4,8,9,10 to which more than 1% of preservatives such as sorbic acid was added, it could be confirmed that contamination by mold did not occur between 30 and 90 days.

On the other hand, in the present invention, the experiment was carried out to determine the antibacterial and deodorizing effect in the molded product by the photocatalyst, respectively.

Experimental Example 1 Sterilization Effect

An ultraviolet (UV) lamp was placed inside the reactor and surrounded by a quartz tube, and a 50 mm × 80 mm photocatalyst-containing starch molding sample was placed on the inner wall of the quartz tube to allow E. coli to pass through the tube. Thereafter, the light was irradiated with a 100W ultraviolet lamp having a wavelength of 360 nm, and then tested for sterilization by a photocatalyst in the reaction vessel.

As a result, E. coli increased to 140% within 2 hours in the absence of UV irradiation, E. coli was all killed within 1 hour when irradiated with ultraviolet rays, iron dioxide instead of carbon dioxide photocatalyst containing more than 70% by weight of anatase In the starch molding containing titanium [Fe (III) doped TiO ₂ ] (Comparative Examples 10, 8 and 10), E. coli was all killed within 40 minutes.

Experimental Example 2 Deodorizing Effect

After placing the UV lamp inside the reactor as shown in FIG. It was made. Thereafter, light was irradiated with a 100W ultraviolet lamp having a wavelength of 360 nm, and then the decomposition efficiency of acetaldehyde in the reaction vessel was investigated.

Decomposition efficiency of acetaldehyde was about 20% when the reaction vessel was irradiated with UV light for 40 minutes, but the decomposition efficiency of acetaldehyde was 80% when 30 minutes of irradiation with UV light was carried out with a sample of starch formed containing a titanium dioxide photocatalyst. Increased to. In particular, in the case of starch formed samples containing titanium dioxide [Fe (III) doped TiO ₂ ] containing iron, acetaldehyde was decomposed more than 90%.

On the other hand, titanium dioxide, iron [Fe (III)] having anatase content of at least 70% by weight, such as fluorine-based water repellent, silicone-based water repellent, 40% by weight of colloidal silica silicate, ethanol, methanol, paraffin, etc. Titanium dioxide to which metals such as vanadium (V), molybdenum (Mo), niobium (Nb) and platinum (Pt) are added, or titanium dioxide metal oxide to which metal oxides such as silicon dioxide, vanadium pentoxide and tungsten oxide are added Alternatively, when mixed and dispersed at 1 to 15% by weight, a small amount of photocatalyst was used to obtain a photocatalyst starch molding having higher antibacterial, deodorizing effect, and water resistance.

Therefore, when forming the starch container using the composition of the present invention it can be seen that not only the antimicrobial, deodorizing, long-term storage is provided, but also the moldability, strength, flexibility of the container.

In addition, although specific embodiments of the present invention have been described and illustrated above, it is obvious that the starch container composition of the present invention may be variously modified and implemented by those skilled in the art.

However, such modified embodiments should not be individually understood from the technical spirit or the prospect of the present invention, and such modified embodiments shall fall within the appended claims of the present invention.

As described above, the present invention provides a sterilization and deodorization function to prevent contamination of biodegradable starch containers and contents by harmful bacteria, thereby improving hygiene, as well as long-term preservation in the case of products requiring long-term distribution and storage. This can improve the consumer's confidence in the product.

Along with this, biodegradable starch containers, which are naturally decomposed by microorganisms in a short period of time when embedded in soil, can provide an environmentally friendly product.

Claims (5)

After mixing 25 to 65% by weight of modified or unmodified starch and 30 to 70% by weight of water, the composition is mixed and injected into a heat press molding machine heated to 140 to 220 ° C. to 0.5 to 8 kgf / ㎠ In the disposable starch container manufactured by molding for 20 seconds to 5 minutes at a pressure, the container composition to be produced by mixing 1-10% by weight of a photocatalyst for sterilization and deodorization; 1-20% by weight of one or more preservatives selected from the group consisting of sorbic acid, parahydroxy benzoic acid esters, propionate and sodium chloride; 1-25 wt% fiber as a tensile strength modifier; Biodegradable starch container composition to give sterilization, deodorization, preservation, characterized in that the release agent comprises 0.01 to 5% by weight. The method according to claim 1, The photocatalyst is a biodegradable starch container composition imparting sterilization, deodorization and preservation, characterized in that titanium dioxide having an anatase content of at least 70% by weight is used. The method according to claim 1, The photocatalytic agent is a biodegradable starch container composition imparting sterilization, deodorization and preservation, characterized in that titanium dioxide to which at least one metal of Fe (III), V, Mo, Nb, and Pt is selectively added is used. The method according to claim 1, A biodegradable starch container composition imparting sterilization, deodorization, and preservation, wherein the photocatalyst is titanium dioxide to which at least one metal oxide of SiO ₂ , V ₂ O ₅ , and WO ₃ is selectively added. delete

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