JP3844335B2 - Molded product formed by molding biodegradable resin composition - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to easy packaging material waste, in particular, relates to a molded article for food industries Ru used for effective packaging material freshness of perishables.
[0002]
[Prior art]
As packaging materials in the food industry, films, sheets, foamed moldings and the like made of petroleum synthetic resins represented by polyolefin and polystyrene are used in large quantities. However, in order to effectively recycle these packaging materials after use, separation and collection are indispensable, so that much labor and cost are required. In particular, these films, sheets, foamed molded products and the like used for food packaging are often contaminated with food residues, so that it is difficult to separate and collect them, and the waste is often landfilled or incinerated.
[0003]
Among them, packaging materials containing a freshness-preserving agent often have direct contact with foods, and are often discarded as food residue as well as food residue. In recent years, composting equipment has been introduced at local governments, large hotels, restaurants, etc. for the treatment of food waste, but packaging materials made from petroleum-based synthetic resins are biodegraded during composting. There is a problem that it is difficult to obtain good quality compost.
[0004]
[Problems to be solved by the invention]
Therefore, the freshness retention time of fresh foods such as fruits and vegetables, fresh fish, meat, and processed foods can be lengthened, and not only can the time and cost required for disposal after use be reduced, but also high quality compost. The development of packaging materials that can be obtained has been desired.
As a result of intensive studies to answer the above needs, the present inventors have used the biodegradable resin composition comprising a biodegradable resin, a freshness-preserving agent, and cellulose or cellulose derivative powder as a raw material for the packaging material. The inventors have found that the problems can be solved and have reached the present invention.
Accordingly purpose of the present invention, together with effective in freshness retention of fresh foods, and to provide easy film or molded articles such as sheets of disposal.
[0005]
[Means for Solving the Problems]
The above-mentioned objects of the present invention include (A) 100 parts by weight of a biodegradable resin, (B) 1 to 20 parts by weight of a freshness-preserving agent, and (C) 50 parts by weight or less of cellulose or cellulose derivative powder as an essential component. This was achieved by a molded product obtained by molding the biodegradable resin composition.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
The biodegradable resin that is usually used as the component (A) of the present invention includes aliphatic hydroxy polyesters such as polyhydroxybutyrate, polylactic acid, polycaprolactone, polybutylene succinate, polybutylene adipate, and polybutylene succinate carbonate. As polycyclic polyester / polyamide, a mixture of polycaprolactone and nylon, etc., as aliphatic / aromatic polyester, polybutylene adipate terephthalate, etc., as modified starch, maleated starch, benzylated starch, laurylated starch, etc., as polyvinyl alcohol A cellulose acetate having a saponification degree of 96 to 99 mol% and cellulose acetate having a substitution degree of 1.5 or more and less than 2.0 may be appropriately selected from commercially available biodegradable resins.
[0007]
Examples of the freshness-preserving agent for the component (B) include antibacterial agents derived from natural products such as hinokitiol, allyl isothiocyanate, ethanol, spice extract (cinnamon extract, mustard extract, pepper extract, etc.), 孟 son bamboo extract, tea catechin. preferable. The antibacterial properties of these antibacterial agents utilize the antibacterial effect of volatile and eluting antibacterial components.
[0008]
In order to exhibit the antibacterial effect of the molded article of the present invention, that is, the freshness maintaining effect, it is appropriate to use 1 to 20 parts by weight of the freshness maintaining agent with respect to 100 parts by weight of the biodegradable resin. If it is less than 1 part by weight, the effective concentration is not effective. On the other hand, when the amount is 20 parts by weight or more, the odor peculiar to the freshness-keeping agent is strong and the odor is attached to the food, so that the taste is impaired.
[0009]
In order to maintain the antibacterial effect of the antibacterial component for a long time, in the present invention, the antibacterial component is supported on a cellulose or cellulose derivative powder .
[0010]
The amount of the freshness-keeping / supporting agent needs to be in a range not exceeding 50 parts by weight with respect to 100 parts by weight of the biodegradable resin. When it exceeds 50 parts by weight, it becomes difficult to produce a molded product such as a film, a sheet, and a foamed molded product made of the biodegradable resin composition.
[0011]
The method for producing a molded article using the composition of the present invention is not particularly limited, and the above-described components (A), (B), and (C) are mixed with Henschel so as to have a predetermined mixing ratio. After mixing with a mixer or tumbler, using a known kneading apparatus such as a single or multi-screw extruder, Banbury mixer, kneader, roll, etc., preparing a pellet by melting and kneading, the obtained pellet is put into a molding machine, It can be obtained by molding. Further, mixing of raw materials by a Henschel mixer or a tumbler can be omitted, and various raw materials can be supplied to a melt-kneading apparatus using separate feeders and kneaded to obtain pellets. Furthermore, pelletization can be omitted, and each component can be mixed in powder form and introduced into a molding machine to obtain a molded product. For molding, for example, a known method such as injection molding, extrusion molding, blow molding, inflation molding, vacuum molding or the like can be appropriately employed, and an arbitrary molded body such as a film, a sheet or a foam molded body can be produced. .
[0012]
In the present invention, from the viewpoint of obtaining a molded product such as a film, a sheet, and a foamed molded article, for example, a plasticizer, a foaming agent, a colorant, a lubricant, a stabilizer, an antioxidant, a mold release agent, and the like. These various additive components can also be blended at the time of pellet production or molding processing of the biodegradable resin composition. Of course, these additive components need to be selected from those that are harmless to the human body.
[0013]
Preferred uses of the molded product of the present invention include wrap film, film laminated wrapping paper, container, tray, insole sheet, subdivision cup, subdivision seasoning, partition sheet, balun, foam cushion sheet Etc.
[0014]
【The invention's effect】
Although the molded article of the present invention has the effect of maintaining the freshness of fresh food by the antibacterial agent, its own biodegradability is not hindered, so it can be easily disposed of without destroying the environment.
[0015]
【Example】
EXAMPLES Hereinafter, although an Example demonstrates this invention further in full detail, this invention is not limited by this.
Example 1.
100 parts by weight of polybutylene succinate as biodegradable resin [(trade name—Bionole) manufactured by Showa Polymer Co., Ltd.], 10 parts by weight of allyl isothiocyanate as freshness-preserving agent, and cellulose powder [(trade name as freshness-holding support agent) -KC Flock) Nippon Paper Industries Co., Ltd.] 20 parts by weight and 2.6 parts by weight of alizanin cyanine green as a colorant were kneaded in a Banbury mixer heated to 200 ° C., pelletized, and molded raw A degradable resin composition sample was obtained.
[0016]
Next, the obtained sample was put into an extruder and molded at 250 ° C. to obtain a sheet having a thickness of 0.5 mm. The obtained sheet was cut into a balun as a food freshness-keeping packaging material, and three sheets were inserted into the sushi lunch box. Assuming carrying conditions without a cold storage place, the inside of the lunch box was observed after being stored at 25 ° C. for 12 hours. As a result, there was no discoloration or change in odor, and the fresh appearance was maintained. Moreover, the wasabi odor of allyl isothiocyanate was sufficient, and the taste was satisfactory.
[0017]
After the meal, the balun soiled with the rice grains and the seasoning of the food was processed with a household composter (Hitachi garbage processing machine BGD-100) together with the food residue, and the balun was clearly decomposed in 2 weeks. Table 1 shows the appearance of the food, the freshness-retaining agent concentration, and the biodegradability results by the poster.
[0024]
Comparative Examples 1-3.
According to the appearance of the food, the freshness-retaining agent concentration, and the poster when the petroleum-based synthetic resin is used as a raw material instead of the biodegradable resin used in Example 1 and when the cellulose or cellulose derivative powder is not added. The results of examining the biodegradability are shown in Table 1.
The concentration of freshness-preserving agent in the container is determined by filling the contents in the storage container, storing it for 30 minutes or a predetermined time after closing the lid, collecting the air in the storage container by the suction method, and performing a ga chromatography analysis. Measured by performing.
[Table 1]
[0025]
As a reference example, Table 2 shows the results of investigation using a poster for the influence of the freshness-keeping agent on the biodegradable resin composition and the biodegradability of the film.
[Table 2]
[0026]
Regarding the effect of the freshness-keeping agent on composting, as can be seen from Table 2, there is no influence on the degree of degradation of the biodegradable resin. This is because microorganisms that promote composting are aerobic, whereas microorganisms that affect the deterioration of food freshness and spoilage are generally anaerobic.
In addition, the biodegradable film of the present invention to which a freshness-preserving agent was added showed better biodegradability than a film simply made from a biodegradable resin. This is considered to be due to the influence of the freshness-holding carrier. That is, in the biodegradable film of the present invention, there is a minute gap between the freshness-keeping carrier and the filmed biodegradable resin, and the surrounding environment becomes aerobic. It is thought that biodegradable resin has been degraded by aerobic microorganisms.
[0027]
These results indicate that the freshness-keeping packaging material comprising the biodegradable resin composition according to the present invention can maintain the active ingredient of the freshness-preserving agent for a long period of time, and is effective in maintaining the freshness of fresh foods, And when discarded after use, there is no effect on the biodegradability of the freshness-preserving agent, and it can be recycled as compost without separation from food residue, so the molded product of the present invention is extremely effective for environmental problems and dust problems. It proves that.

Claims (4)

(A) a biodegradable resin 100 parts by weight, (B) a freshness keeping agent 20 parts by weight, and (C) a biodegradable resin composition according to 50 parts by weight or less of cellulose or powder as essential components of the cellulose derivative Molded product formed by molding. The biodegradable resin as component (A) is at least one selected from the group consisting of aliphatic polyesters, aliphatic polyesters / polyamides, aliphatic / aromatic polyesters, modified starches, polyvinyl alcohol and cellulose acetate. The molded article according to claim 1, which is a resin . The molded article according to claim 1 or 2, wherein the freshness-preserving agent of the component (B) is a natural product-derived antibacterial agent. The molded article according to any one of claims 1 to 3, wherein the molded article is a film, a sheet, or a foam molded article.