JPH0812701A - Fertilizer-or perfume-containing biodegradable plastics and biodegradable plastic produced therefrom - Google Patents

Abstract

PURPOSE:To obtain various plastic products, such as a flowerpot, which can be disposed of without polluting the environment by mixing a biodegradable plastic material with various materials, such as a fertilizer. CONSTITUTION:A fertilizer-contg. biodegradable plastics is obtd. by mixing a biodegradable plastic material 2 with specified amts. of various fertilizers 3. Thus obtd. plastics is molded into various plastic product such as a flowerpot. When the fertilizers mixed are water-sol., they are dissolved by water and convert the pot into a network, producing excellent effects in water drainage.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fertilizer-containing biodegradable plastic obtained by mixing a predetermined amount of fertilizer or the like into a plastic having high strength, biodegradability, and controllable decomposition time. In more detail, biodegradable plastic materials are mixed with inorganic fertilizers, organic fertilizers, etc. or fragrances, and using these as materials, culture flower pots, flower pots, ropes, golf tees for fertilizers, and scented sheets. The present invention relates to various biodegradable plastic products (for example, flower pots) capable of molding various plastic products such as wood and decomposing them while simultaneously supplying fertilizer.

[0002]

2. Description of the Related Art In recent years, environmental pollution due to plastic waste has become a serious social problem. That is, plastics used in large amounts for various purposes, including packaging materials, have excellent mechanical strength and durability, but are not decomposed when discarded in the natural world after use. It has a problem that it remains semi-permanently and significantly deteriorates the environment. For this reason, as one of intelligent materials, in fields such as agricultural fields, medical care, sanitary materials, etc., biodegradable plastics that easily decompose and disappear after maintaining initial physical properties for a predetermined time are being developed. .
Strictly speaking, "biodegradable" means that the material decomposes into carbon dioxide and hydrogen by the action of microorganisms, and plastics with such biodegradability, even if they are discarded in the natural world. , Don't worry about deteriorating the environment.

Examples of the above-mentioned biodegradable plastics include those described in Japanese Patent Application No. 4-202436. This plastic is obtained by dissolving chitosan in an acidic solution such as acetic acid and uniformly dispersing a predetermined amount of powdery cellulose or rice starch granules or powdery cellulose and rice starch granules into a stock solution for film formation. , Using this undiluted solution, a metal drum,
Alternatively, a biodegradable plastic film can be easily manufactured by casting on a dry surface such as an endless belt and drying and solidifying. Chitosan is obtained by deacetylating chitin contained in shells of shrimp, crab and the like by a strong alkaline treatment.

[0004]

The plastic constructed as described above is easily decomposed by microorganisms when it is dumped in the soil or in the ocean or rivers, and the constituent substances are all natural products. , Even after disassembling, there is no fear of adversely affecting the environment. As described above, various types of biodegradable plastics have recently been developed which are extremely excellent in protecting the natural environment. The present inventor, as a result of diligent research into effective utilization of such a naturally degradable plastic, has shown that a fertilizer-containing biodegradable plastic obtained by mixing a biodegradable plastic with a fertilizer or a perfume, and molding using the plastic. Succeeded in developing plastic products such as flower pots.

By the way, usually, vegetables such as eggplant, tomato, cucumber, cabbage, and seedlings of various flowers are seeded in a culture pot (also referred to as a pot) made of vinyl and germinated, and then the seedling is grown. According to the above, a vinyl culture pot (also called a pot) is gradually enlarged, and seedlings are transplanted to a field when it reaches a predetermined size. However, changing the flower pots according to the growth of seedlings was a heavy labor and a problem for farmers.
Also, many used pots are not reused,
It was thrown away as garbage. For this reason, the plastic culture pots that have been used so far do not decompose spontaneously, which has become a major social problem in terms of environmental pollution.

In view of the above, the present invention mixes various fertilizers or fragrances with various biodegradable plastic materials that have already been developed, and uses these materials to produce various plastic products such as flower pots. By forming it, it aims at solving the above-mentioned various problems.

[0007]

Therefore, the first technical solution adopted by the present invention is fertilizer-mixed biodegradable plastic characterized by mixing a predetermined amount of fertilizer into the biodegradable plastic material. The second technical solution is a fertilizer-mixed biodegradable plastic product characterized by being formed by using a material in which a predetermined amount of fertilizer is mixed in a biodegradable plastic material, and the third technical solution is A perfume-containing biodegradable plastic, characterized in that a predetermined amount of perfume is mixed into the biodegradable plastic material.

[0008]

[Function] Various biodegradable plastic materials are mixed with various fertilizers and the like, and various plastic products such as flower pots are formed from the materials thus produced. When inorganic or organic substances as fertilizers are mixed with the biodegradable plastic, the mixing amount is particularly limited if the strength required for a plastic product such as a flowerpot can be maintained when the plastic is molded. There is no. In the case of a fertilizer that dissolves in water or the like mixed with biodegradable plastic, the pot itself becomes a net-like shape after the fertilizer has melted, and on the contrary, it has an excellent effect in draining.
In addition, when a pot with a large amount of fertilizer mixed therein is formed on the inner surface side of the flowerpot, the pot has an excellent fertilizer effect. In addition, seedlings can be efficiently managed according to the growth of seedlings by simply putting the seedlings in the above-mentioned flowerpots and putting them in a flowerpot made of the same material, which is one size larger, and reduce the burden on agricultural work. can do.

[0009]

The preferred embodiments of the present invention will be described below. FIG. 1 is a perspective view of a flowerpot as an embodiment according to the present invention, and FIG. 2 is an enlarged sectional view of the flowerpot.

An example of the biodegradable plastic used in the present invention will be described. The biodegradable plastic here is composed of chitosan and cellulose as basic components. This plastic is made soluble in water by first converting chitosan into an acetate salt. At this time, chitosan is cationic. On the other hand, when cellulose is suspended in water, it becomes anionic. When the two liquids are mixed, cast and dried, a bond is formed between chitosan and cellulose, and a biodegradable plastic film is obtained. The biodegradable plastic is not limited to the above example, and any plastic material may be used as long as it is a plastic that is easily decomposed by microorganisms even if it is dumped in soil, the ocean, rivers, or the like.

Then, a predetermined amount of an inorganic or organic fertilizer is mixed with the plastic raw material. When mixing inorganic and organic substances as fertilizers, the amount of the mixture should be such that the strength required by the plastic product when molded can be maintained (for example, in the case of a flower pot, the plant in the pot). (Strength that can be carried in a planted state) There is no particular restriction on the mixing ratio. Therefore, for example, the ratio of the contaminant to the biodegradable plastic is 10% to 90% by weight based on the purpose of the product, and various ratios can be selected while considering the actual mixing result. . Further, the decomposition rate of the plastic product can be controlled by the mixing ratio of the biodegradable plastic material and the fertilizer.

When the fertilizer-containing biodegradable plastic is used to mold the flowerpot shown in FIG. 1 and other plastic products such as ropes, boxes, films, etc., these products are decomposed with the passage of time and at the same time. Fertilizer can be fed into the soil. For example, in the case of growing seedlings using the thus-formed flower pots, the pots in which the seedlings are planted can be simply buried in the soil, and the seedlings can be automatically fed with fertilizer as the plastic is decomposed. Also, since the pot itself is disassembled, there is no problem in treating the pot. Therefore, it is possible to efficiently manage the growing seedlings according to the growth of the seedlings and reduce the burden on the agricultural work.

Further, when the fertilizer mixed in the biodegradable plastic is made to be a substance which is particularly soluble in water or the like, the pots molded from this plastic differ in the speed of fertilizer dissolution and the speed at which the plastic decomposes. After melting, the pot itself becomes a mesh shape, and rather exhibits an excellent effect in draining. Furthermore, when a pot with a large amount of fertilizer mixed therein is formed on the inner surface side of the flowerpot, the pot has an excellent fertilizer effect. A cross-sectional view of a state in which fertilizer and the like are mixed with the biodegradable plastic material is shown in FIG. As is clear from this figure, when a substance that melts faster than the plastic is mixed, the plastic becomes a perforated state and the water permeability is improved.

In the above embodiments, fertilizer was described as an example of the substance mixed in the plastic material. However, by mixing a substance such as a fragrance, a pesticide, vitamin or the like in addition to the fertilizer, it is suitable for applications other than flower pots. Plastic products can be molded. Specifically, the present inventor uses biodegradable plastics (trade name "Mataby" manufactured by Nippon Synthetic Chemical Industry Co., Ltd., and "Bionore" manufactured by Showa High Polymer Co., Ltd.) to produce these biodegradable plastics. About 20% by weight of a mixture (single tofu okara, dried rice husk powder, chaff powder, oil dregs, dried cow dung) is mixed into a mixed material or a single material to produce a plastic product. In each case, we were able to obtain quality according to the product purpose. Incidentally, the Mataby has a property of being relatively soluble in water, and since Bionole is water-insoluble, by mixing these amphoteric biodegradable plastics in a predetermined ratio, the same water permeability as described above is obtained. You can get plastic. Further, the present inventor has formed a biodegradable plastic in which lavender powder is mixed with the biodegradable plastic, but in this case, even after the formation, the good odor of lavender does not disappear, and the biodegradability of the scented product is good. I was able to get plastic. As a result, using biodegradable plastic mixed with fertilizers and flavors as described above,
It is possible to make various plastic products suitable for the purpose of use. Specifically, a odor can be eliminated by using a plastic film mixed with a fragrance or the like to make a bag for treating raw garbage and the like. Also, golf tees mixed with fertilizers and pesticides will disinfect and fertilize lawns even if they are thrown away. The present invention can be implemented in various other forms without departing from the spirit or main characteristics of the present invention. Therefore, the above-mentioned embodiments are merely exemplifications in all respects, and are limitedly interpreted. should not be done.

[0015]

As described above in detail, according to the present invention, a product using this plastic is easily decomposed by microorganisms even if it is dumped in soil or in the ocean or river. Does not cause environmental damage. In addition, when a flower pot or the like is molded using plastic containing fertilizer, the labor of fertilizing the plant can be saved. Furthermore, when a pot with a large amount of fertilizer mixed therein is formed on the inner surface side of the flower pot, the pot has an excellent fertilizer effect. Also, with seedlings planted in a flower pot, just put them in a flower pot made of the same material, which is one size larger,
The seedlings can be efficiently managed according to the growth of seedlings, and the burden on farm work can be reduced. Furthermore, biodegradable plastics formed by mixing various mixtures such as fragrances can produce excellent effects such as the production of plastic products for various purposes.

[Brief description of drawings]

FIG. 1 is a perspective view of a flowerpot as an embodiment according to the present invention.

FIG. 2 is an enlarged sectional view of the flower pot.

[Explanation of symbols]

 1 Flower pot 2 Biodegradable plastic 3 Fertilizer

Claims (4)

[Claims] 1. A fertilizer-containing biodegradable plastic, characterized in that a predetermined amount of fertilizer is mixed into the biodegradable plastic material. 2. A fertilizer-containing biodegradable plastic product, which is formed by using a material obtained by mixing a biodegradable plastic material with a predetermined amount of fertilizer. 3. The fertilizer-mixed biodegradable plastic product according to claim 2, wherein the product is a flowerpot. 4. A perfume-containing biodegradable plastic, characterized in that a predetermined amount of perfume is mixed into the biodegradable plastic material.