JPH07213204A - Biodegradable commodity - Google Patents

Abstract

PURPOSE:To obtain a biodegradable commodity composed of a member body of desired shape made of a biodegradable material and a specific film, usable with satisfied performance and quality throughout its normal service life, helpful to natural environmental protection, and useful as e.g. a fishing commodity. CONSTITUTION:This biodegradable commodity is composed of (A) a member body of desired shape made of a biodegradable material such as PVA or polylactic acid and (B) a film such as of polyethylene terephthalate, formed on the surface of the member body, capable of retarding the biodegradation of the member body by a specified period of time, and debondable or degradable under the service environment or natural environment. It is preferable that the film B be made of a material having a degradation rate lower than that of the biodegradable material A.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a biodegradable article used for fishing articles, sports articles, etc. that have the opportunity to come into contact with the natural environment.

[0002]

2. Description of the Related Art In recent years, consciousness of environmental protection has been increasing, and the dumping of fishing equipment, sports equipment and the like, which have an opportunity to come into contact with the natural environment, into the natural environment has been studied. That is, since fishing articles such as fishing lines and sports articles such as golf tees are made of a resin material such as polyethylene that is very stable in the natural environment, they remain semi-permanently without being deformed in the natural environment. This has become a problem in the growing awareness of environmental protection, and studies are underway on materials for these products.

Recently, attempts have been made to use biodegradable materials as materials for these products. For example, JP-A-5
No. 41937 discloses a fishing line winding made of a biodegradable material, and Japanese Patent Application Laid-Open No. 5-43637 discloses a fishing net or a fishing line made of a biodegradable material.

[0004]

However, since the biodegradable material is exposed to the outside in the above-mentioned articles, the use conditions in nature (conditions such as the presence of microorganisms such as microorganisms are present at the start of use). ) Promotes biodegradation. Usually, biodegradation proceeds considerably after a certain period of time has passed since the user started using the biodegradation. Therefore, the performance and quality are significantly deteriorated, the usable period is shortened, and the usable number is reduced. In particular, such a phenomenon is more prominent in a material having a better biodegradability, that is, a material having a faster biodegradation rate in a natural environment.

The present invention has been made in view of the above point, and can be used with satisfactory performance and quality up to a normal use period, and can exhibit excellent biodegradability in a natural environment. The purpose is to provide a degradable product.

[0006]

SUMMARY OF THE INVENTION The present invention comprises a member body of a desired shape made of a biodegradable material, and a coating formed on the surface of the member body to delay biodegradation of the member body for a predetermined period. A biodegradable article characterized by being provided.

Here, the biodegradable article of the present invention is applicable to a package for storing a fishing rod, a fishing line,
Examples include fishing tackle equipment such as lures and sports equipment such as golf tees that have the opportunity to come into contact with the natural environment.

In the present invention, examples of the completely degradable biodegradable material constituting the member main body include biodegradable chemically synthetic plastics such as polyvinyl alcohol, polycaprolactone and aliphatic polyester; polylactic acid, polyhydroxybutyric acid and the like. Biodegradable fermentation-produced plastics; reaction products of cellulose and chitosan; biodegradable natural plastics such as starch; biodegradable plastics obtained by kneading starch and polyvinyl alcohol can be used. A partially degradable biodegradable plastic obtained by kneading starch and polyethylene may be used.

In the present invention, the coating film is preferably peeled or decomposed in a use environment or a natural environment. By peeling and disassembling, it is possible to accelerate the return to nature after use and disposal. Therefore, it is necessary to appropriately select the material of the coating film in consideration of the use condition, use environment and use period of the article. For example, when the period of use is specified, it has a decomposition rate lower than the decomposition rate of the biodegradable material constituting the member body so as to suppress and delay the biodegradation of the member body within that period. The material is selected as the coating material.

Specifically, the material of the coating film is selected as follows according to the use conditions, use environment and use period. When it is used for a long time of immersion in water, for example, when it is used for fishing line, the material of the coating film is polyethylene terephthalate, polybutylene terephthalate, ester polyurethane, poly-1,4-cyclohexanedimethylene terephthalate, polybutylene naphthalate, etc. Degradable plastics can be used.

In the case where the light irradiation time is specified, for example, fishing gear for night fishing, the material of the coating is a photodegradable plastic obtained from a copolymer of ethylene and carbon monoxide. Can be used.

When used in applications where heat is generated by friction, such as fishing lines and guide members that come into contact with fishing lines, thermoplastics having a melting point of 200 ° C. or lower, preferably 110 ° C. or lower, can be used.

In a case where frictional resistance occurs between a member that abuts upon use, for example, when used for fishing line, a material that peels off by friction can be used. For example, when the period until peeling is set to be relatively short, in order to accelerate decomposition, soap having hydrophilicity, that is, lauric acid, myristic acid, parimitic acid, stearic acid, oleic acid, linoleic acid, linolenic acid is used. Alkaline salts of higher fatty acids such as (usually sodium salts) are used as coating materials. On the other hand, when the period until peeling is set to be relatively long, a silicone material having water repellency is used to delay decomposition. As the silicone material, a silicone oil (viscosity 0.65 to 1.00) such as dimethyl silicone oil containing polysiloxane as a main component is used.
Modified silicone oil such as alkyl-modified dimethyl silicone oil or epoxy-modified dimethyl silicone oil; oil component such as methylphenyl oil or fluorosilicone oil, and thickener such as lithium soap, carbon black or fluorine resin Silicone grease consisting of In addition, when there is no limitation on the period until peeling, wax which is an ester of a higher fatty acid and a monohydric alcohol or oil and fat which is a glycerin ester of a higher fatty acid is used. The speed of peeling wax and oil is between the speed of peeling silicone oil / silicone grease and the speed of peeling soap. The coating film made of the above material can be formed on the member body by a usual coating method.

The thickness of the coating is set to a thickness that can withstand the natural environment at least during the period of use. That is, the thickness of the coating is usually in the range of several microns to several tens of microns in the case of one layer, and is set to several hundreds of microns in the case of multiple layers, so that it is sufficiently thin with respect to the thickness of the member body. To For example, when the period until peeling is set to be relatively short, the thickness of the coating is made thin, and when the period until peeling is set to be relatively long, the thickness of the coating is made thick.

When actually used, it is necessary to appropriately select both the material of the coating and the thickness of the coating in consideration of the use conditions, use environment and use period. Further, the period until peeling of the coating may be adjusted by adjusting the adhesion between the member body and the coating. For example, the surface of the member main body may be subjected to a specific treatment to roughen the surface of the member main body to improve the adhesiveness with the coating and to lengthen the period until the coating is peeled off.

In the present invention, the coating is preferably formed so that it can be identified when peeled or decomposed. In this case, by forming a film by the following method, it is possible to identify the peeling or decomposition.

First, there is a method of peelably forming a coating film using the above-mentioned coating material having water repellency.
In this case, since the coating film has water repellency, it is possible to easily identify whether the coating film is peeled or decomposed by checking the water repellent state by applying water. Further, a material obtained by mixing a fluororesin or fluorine-based fine particles with a material other than the above-mentioned coating material may be formed as another coating on the outermost layer.

Secondly, a method of forming a coating in a peelable manner by using a material obtained by mixing a dye or a pigment with the above-mentioned coating material and coloring the coating, or a gloss of metal particles or the like to the above-mentioned coating material. There is a method of imparting glitter to the coating by forming the coating so that the coating can be peeled off using a material having a mixture of materials having or causing light reflection. In this case, since the coating is colored or has glitter, it is possible to easily visually identify whether the coating is peeled or decomposed.

In the present invention, the coating may be a single layer or a plurality of layers of two or more layers. When the coating has a plurality of layers, it is necessary to appropriately combine the above-mentioned coatings in consideration of the use condition, use environment and use period of the article.

Further, in the present invention, the peelable or decomposable coating may be formed on at least a part of the member main body. Therefore, a film made of a material that does not peel or decompose may be formed on a part of the member body, and a film that can be peeled or decomposed may be formed on the other part. For example, it is possible to maintain the balance of performance and quality of the article by forming and protecting a film made of a material that does not peel off or decompose on a portion that is particularly worn during use.

In the present invention, naturally-occurring dyes, pigments, or fine particles added to the coating material may be used. This facilitates spontaneous reduction of the biodegraded product. Further, the coating may be provided with antibacterial properties to prevent microorganisms from coming into contact with the biodegradable material as much as possible to further delay the decomposition of the biodegradable material.

[0022]

The biodegradable article of the present invention comprises a member main body made of a biodegradable material and having a desired shape, and a coating formed on the surface of the member main body to delay biodegradation of the member main body for a predetermined period. It is characterized by that.

As shown in FIG. 1, the biodegradation of the biodegradable material usually proceeds with time (characteristic curve X). In the present invention, by forming a film on the surface of the member body made of a biodegradable material, biodegradation of the biodegradable material is suppressed and delayed during the use period and the unused period, and after the use period has elapsed or is discarded. The biodegradation can then proceed by natural force (characteristic curve Y). Therefore, the progress of biodegradation of the member body can be controlled by selecting the material and thickness of the coating. Further, by forming the coating in a distinguishable manner when peeled or decomposed, the user can confirm the biodegradation of the member main body before or before the biodegradation of the member main body.

[0024]

Embodiments of the present invention will be specifically described below with reference to the drawings. (Embodiment 1) FIG. 2 is a perspective view showing a fishing tackle container as an embodiment of the biodegradable article of the present invention. This fishing tackle storage container 1 is a main body 11 which is a cylindrical body with one end closed.
And a lid 12 which is a cylindrical body having a diameter slightly larger than the diameter of the main body 11 and closed at one end.

Each of the main body 11 and the lid 12 is composed of a member main body made of a biodegradable material and a coating formed on the surface thereof. That is, as shown in FIG. 3, the main body 11 has a wall thickness of 0.1 to 1 formed by resin molding using polyhydroxybutyric acid having a melting point of 100 to 110 ° C.
The container main body 11a has a thickness of 5 mm, and the coating 11b has a thickness of 5 to 20 μm and is formed by coating using an ester polyurethane mixed with a colorant. Also,
The lid 12 also has the same structure as the main body 11.

Fishing tackle storage container 1 constructed in this way
Since the hydrolysis rate of the ester-based polyurethane that is the material of the coating film 11b is slower than the biodegradation rate of polyhydroxybutyric acid that is the material of the container body 11a, it can be used without problems during the normal usage period of 1 to 3 years. The coating film 11b was hydrolyzed and collapsed, and the container body 11a was rapidly biodegraded after the container body 11a was exposed to the outside. Further, since the coating 11b is colored, the coating 1
It could be easily identified when 1b was hydrolyzed and the container body 11a was exposed.

For comparison, a fishing tackle storage container was prepared by forming the main body and the lid with only polyhydroxybutyric acid. This fishing tackle storage container has undergone considerable biodegradation in the soil in 30 days, and the performance and quality suitable for use could not be maintained.

By forming the main body 11 in the shape of a bag with a soft film made of polyhydroxybutyric acid and attaching a closed type fastener, the lid 12 is unnecessary. In this case, even if the outer surface of the bag-shaped main body is coated with an ester polyurethane mixed with a colorant, the same effect as described above is exhibited. Even when the main body 11 is made of a woven fabric in which fibers made of polyhydroxybutyric acid are woven, the same effect as described above can be obtained by coating the surface of each fiber with an ester polyurethane mixed with a coloring agent. . (Embodiment 2) FIG. 4 is a side view showing a fishing line which is another embodiment of the biodegradable article of the present invention, and FIG. 5 is a sectional view taken along the line AA in FIG. As shown in FIG. 5, the fishing line 2 includes a thread main body 2a formed by a spinning machine using an aliphatic polyester, and a coating having a thickness of 0.2 to 2.0 μm formed by coating using a fluororesin. Two
It consists of b and.

The fishing line 2 constructed as described above is provided with the coating 2
b suppresses the biodegradation of the aliphatic polyester that is the material of the thread main body 2a, and can be used without problems for one season which is the normal usage period, and due to the friction between the member with which the coating 2b abuts the fishing line. After being peeled off and the thread body 2a was exposed to the outside, the biodegradation of the thread body 2a rapidly proceeded. Further, since the coating film 2b is made of a fluororesin and has water repellency, it was possible to easily determine whether the coating film 2b remained by observing the water repellency.

For comparison, a fishing line was prepared by forming a line body only from aliphatic polyester. Biodegradation of this fishing line progressed due to usage conditions in nature, and it did not have suitable performance and quality when left standing for 2 months after being used once.

Note that, as shown in FIG. 6, even if a plurality of filaments 21 made of an aliphatic polyester are arranged in a net filament and a coating film made of a fluororesin is formed on the outside thereof, Has the same effect as. At this time, as shown in FIG. 7, a coating film 21a may be formed on the surface of each filament 21 by coating with a fluororesin. (Embodiment 3) FIG. 8 is a side view showing a lure which is another embodiment of the biodegradable article of the present invention, and FIG. 9 is a sectional view taken along the line CC in FIG. As shown in FIG. 9, the lure 3 is a hollow luer body 3a having a wall thickness of 0.3 to 3 mm formed by resin molding using an aliphatic polyester.
And a coating film 3b having a thickness of several tens of μm formed by coating using a hydrolyzable plastic such as polyethylene terephthalate.

The lure 3 constructed in this way is composed of the coating 3
Since the hydrolysis rate of polyethylene terephthalate, which is the material of b, is slower than the biodegradation rate of the aliphatic polyester, which is the material of luer body 3a, it can be used without problems for one year, which is the normal usage period, 3b was biodegraded and disappeared, and the lure body 3a was rapidly biodegraded after the lure body 3a was exposed to the outside.

For comparison, a lure body was prepared by forming a lure body only from the aliphatic polyester. This lure has undergone biodegradation depending on the conditions of use in nature, and did not have suitable performance and quality after being used for several months.

As shown in FIG. 10, the lure body 3
a is formed of an aliphatic polyester, a pattern is formed on most of the outer surface of the resin by urethane resin or epoxy resin, and a film 3b formed by coating with polyethylene terephthalate is formed on a region 31 where the lure is not easily scratched or inconspicuous. Even if it is done, the above effect is exhibited. In this case, the coating 3b of the region 31 is first hydrolyzed, and then the luer body 3a of the region corresponding to the region 31 is hydrolyzed.
Biodegrades. In the areas other than the area 31, since the pattern is formed by the urethane resin or the epoxy resin, hydrolysis does not occur. Therefore, the lure 3 shown in FIG.
Biodegrades from the inside starting from the region 31.

[0035]

As described above, the biodegradable article of the present invention is formed on a member body of a desired shape made of a biodegradable material and on the surface of the member body, and delays the biodegradation of the member body for a predetermined period. Since it is provided with a coating film, the progress of biodegradation of the member main body can be adjusted. Therefore, it is possible to suppress the progress of biodegradation during the unused period or during the period of use, and maintain a high performance and high quality state. Further, after the film is peeled or decomposed, biodegradation proceeds rapidly in the natural environment and is naturally reduced, which is useful for protecting the natural environment.

Further, since the coating is formed so as to be distinguishable when peeled or decomposed, it is possible to recognize the start time of biodegradation of the member main body. Therefore, the article can always be used in a high-performance and high-quality state.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing a relationship (biodegradation rate) between a rate of biodegradation and time.

FIG. 2 is a perspective view showing a fishing tackle container which is an embodiment of the biodegradable article of the present invention.

3 is a sectional view taken along the line AA in FIG.

FIG. 4 is a side view showing an example of a fishing line which is another embodiment of the biodegradable article of the present invention.

5 is a cross-sectional view taken along the line BB in FIG.

FIG. 6 is a side view showing another example of a fishing line which is another embodiment of the biodegradable article of the present invention.

FIG. 7 is a cross-sectional view of a filament of the fishing line shown in FIG.

FIG. 8 is a side view showing an example of a lure which is another embodiment of the biodegradable article of the present invention.

9 is a cross-sectional view taken along the line CC in FIG.

FIG. 10 is a partially cutaway side view showing another example of a lure which is another embodiment of the biodegradable article of the present invention.

[Explanation of symbols]

1 ... Fishing tackle storage container, 2 ... Fishing line, 2a ... Thread body, 3a
... lure body, 11 ... body, 11a ... container body, 2b,
3b, 11b, 21a ... Coating, 12 ... Lid, 21 ... Filiform, 31 ... Region.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI technical display area A63B 57/00

Claims (4)

[Claims] 1. A biodegradation comprising: a member body having a desired shape made of a biodegradable material; and a coating formed on the surface of the member body to delay biodegradation of the member body for a predetermined period. Sex supplies. 2. The biodegradable article according to claim 1, wherein the coating film is peeled or decomposed in a use environment or a natural environment. 3. The biodegradable article according to claim 2, wherein the coating is formed so as to be distinguishable when peeled or decomposed. 4. The coating comprises a material having a degradation rate less than that of the biodegradable material.
Biodegradable supplies as described.