JPH10248381A - Fixing member for plant and production thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fixing member, which has biodegrability and is equipped with a function for promoting the growth of plant, for fixing the plant until this plant take root, and suitable production thereof. SOLUTION: This fixing member for plant is provided with a head part almost in the form of plate piece and an almost stick-shaped leg part 2 sharpening an anti-head part side end part while being extended from the rear side of head part nonparallelly with this rear side, the head part and the leg part are integrally molded while using a biodegradable resin component, and the biodegradable resin component contained selected one of fertilizer and leaf mold at least. Further, it is preferable that sawdust is contained. Since the fertilizer and the leaf mold are discharged with the biodegradation of fixing member, the growth of plant fixed by this fixing member is promoted so that the period to the rooting of plant can be shortened.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a biodegradable plant fixing member and a method for producing the same. It relates to a suitable manufacturing method.

[0002]

2. Description of the Related Art In many cases, ball games such as golf courses, baseball fields, and soccer fields, and lawns such as parks, gardens, hills, and embankments are artificially established. Such artificial settlement is achieved by planting a turf lump (hereinafter, referred to as a "turf body") in a substantially plate shape or the like at a desired location, growing the turf in the turf body, and rooting the soil. Done. However, before the implanted lawn takes root, the lawn is often peeled off or displaced by the steps of a person or by the influence of wind, rain, or the like. In particular, lawns planted on hills, embankments, etc.
Peeling, misalignment and the like are likely to occur. In order to prevent such a situation, a substantially L-shaped fixing member formed by cutting wood, bamboo, or the like is used. This fixing member fixes the turf to the soil by inserting one side of the substantially L-shape into the turf and allowing a part of the side to reach the soil.

[0003]

The above-mentioned conventional fixing member often remains in the lawn or soil even after the lawn is rooted. This is because the period until the wood, bamboo and the like constituting the fixing member rots is generally longer than the period until the planted lawn takes root in the soil. The fixing member remaining in this way is not only undesirably aesthetically pleasing, but also may hinder traffic on the turf or damage blades of a lawn mower or the like. Is preferably removed. However, golf courses,
In a baseball field, a soccer field, a park, or the like, a lawn is implanted in a vast area at a time, so that the number of fixing members used is very large. For this reason, it is considered that a great deal of labor and cost are required to recover the fixing member, and there are many fixing members that are forgotten to be collected even if they are carefully collected. Therefore, it is difficult to collect all the used fixing members.

On the other hand, Japanese Patent Application Laid-Open No. 9-9781 discloses a plant fixing member comprising a biodegradable resin composition. This fixing member fixes the turf until the turf is rooted, and after the turf is rooted, it is biodegraded and absorbed by soil or the like. Therefore, if this is used, the trouble of collecting the fixing member as described above can be omitted.

[0005] The object of the present invention is to solve the problem described in
Another object of the present invention is to provide a fixing member for plants, which is provided with a further function added to the fixing member described in Japanese Patent Application Laid-Open Publication No. H11-209,878. Another object of the present invention is to provide a suitable method for producing the above-mentioned fixing member for plants.

[0006]

Means for Solving the Problems The present inventor has disclosed Japanese Patent Application Laid-Open No.
No. 9781, a fixing member having a new function of “promoting the growth of a plant to be fixed” in addition to the functions of “fixing a plant” and “biodegradability” provided in the fixing member, and a preferred method of manufacturing the fixing member. Were studied, and the present invention was completed.

That is, the fixing member for plants according to claim 1 is
A substantially plate-shaped head, comprising a substantially bar-shaped leg portion extending from the back surface of the head in a direction non-parallel to the back surface and having a sharp end on the opposite side of the head,
A plant fixing member in which the head and the leg are integrally formed using a biodegradable resin composition, wherein the biodegradable resin composition contains a fertilizer.

[0008] The plant to be used for the "fixing member" can be appropriately selected from plants that require a predetermined period of time from being planted at a predetermined planting site to being rooted at the site, and is particularly preferable. An example of the object to be used is the above-mentioned lawn. Since the fixing member according to the first aspect is made of a biodegradable resin composition containing a fertilizer, the fertilizer is released as the fixing member is biodegraded. Since the growth of the plant fixed by the fixing member is promoted by the fertilizer, effects such as shortening a period until the plant takes root are obtained.

As the "biodegradable resin" constituting the biodegradable resin composition, a material having biodegradability and having good moldability in order to facilitate the integral molding of the fixing member is used. Is preferred. In addition, it is preferable to use a flexible material as a raw material in order to easily perform a piercing operation or the like when fixing the plant. Furthermore,
As described above, it is preferable to use a material that can be easily cut by a blade or the like in order to prevent the blade or the like of the lawnmower from being damaged. The biodegradable resin satisfying such conditions includes a starch or a derivative derived from a starch-based agricultural product as a main material, and a modified polyvinyl alcohol-based resin having hydrophilicity and biodegradability. And the two bind to each other at the molecular level to form an IPN (Interpenetrated).
A homogeneous alloy having a (Network) structure can be exemplified.

As the above-mentioned "fertilizer", conventionally known ones can be appropriately selected and used, and those containing only one kind of element such as nitrogen, phosphorus, potassium and the like may be those containing two or more kinds. There may be. This fertilizer can be mixed with the biodegradable resin by, for example, solid fertilizer as it is, or liquid fertilizer by being adsorbed on a porous material or the like.

The amount of the fertilizer to be mixed is preferably 0.1 to 10 parts when the whole biodegradable resin composition of the present invention is 100 parts by weight (hereinafter simply referred to as “parts”). , 1 to 5 parts. If the amount is less than 0.1 part, the effect of the fertilizer on promoting plant growth may not be sufficiently exhibited. On the other hand,
If the amount exceeds 0, the elasticity of the fixing member is reduced, so that the fixing member may be easily broken when used.

According to a second aspect of the present invention, there is provided a fixing member for a plant, comprising a substantially plate-shaped head, and a substantially bar-shaped leg extending from the back surface of the head in a direction not parallel to the back surface and having a sharp end on the side opposite to the head. The head and the leg are a plant fixing member integrally molded using a biodegradable resin composition, wherein the biodegradable resin composition contains humus. Features.

As the "biodegradable resin" constituting the biodegradable resin composition, those described in the description of claim 1 can be used. Further, the plants to which the fixing member is to be used are as described in the description of the first aspect. Since the fixing member according to the second aspect is made of a biodegradable resin composition containing humus, humus is mixed into the soil as the fixing member is biodegraded. The soil is modified by the mulch, and the growth of the plant fixed by the fixing member is promoted, so that an effect of shortening the period until the plant takes root can be obtained.

Here, the term "humus" refers to soil formed by decay of fallen leaves and the like, and generally available as "humus" or naturally generated outdoors can be used. Moreover, what is marketed as "culture soil" can be used similarly to the above-mentioned humus. This mulch usually has some form of fallen leaves, but it is preferable to grind and use this. This facilitates mixing of the humus and the biodegradable resin and molding of the resin composition, and further improves the strength of the fixing member. Further, commercially available mulch usually contains a certain amount of water. For the same reason, it is preferable to use the humus after removing the water by drying or the like.

The amount of the humus mixed is 0.1 to 10 based on 100 parts of the entire biodegradable resin composition of the present invention.
Parts, more preferably 1 to 5 parts. If the amount is less than 0.1 part, the above-mentioned humus may not sufficiently exert the effects of soil improvement and plant growth promotion. On the other hand, when the mixing amount exceeds 10 parts, the elasticity of the fixing member is reduced, so that there is a possibility that inconveniences such as easy breakage during use may occur.

The fixing member for plants according to claim 1 or 2 may contain both fertilizer and humus. In that case, the total mixing amount of the fertilizer and the humus is preferably 0.5 to 20 parts, and more preferably 1 to 10 parts, based on 100 parts of the entire biodegradable resin composition. Also,
As the fertilizer and the humus, it is preferable to use a fertilizer and a humus that have a color similar to that of the soil or that have the same system as the soil and have a slightly darker color than the soil. When such a fertilizer or humus is mixed, the fixing member can be made to have a color similar to the soil without coloring with other pigments or the like. This makes the fixing member less noticeable at the time of use, thereby improving the aesthetic appearance.

According to a third aspect of the present invention, there is provided the fixing member for plants, wherein the biodegradable resin composition further contains sawdust.

The mixing of "sawdust" can reduce (a) the amount of the biodegradable resin composition used to reduce the manufacturing cost of the fixing member, and (a) the decomposition speed of the fixing member ( (Rotting speed) can be increased. Instead of sawdust, crushed or crushed plant materials such as paddy and straw can also be used. In addition, the sawdust also exerts an action as a plant fertilizer to some extent, but is different from the one that is positively mixed for the purpose of promoting plant growth like the “fertilizer” according to claim 1. .

The amount of the sawdust mixed is from 25 to 25, based on 100 parts of the entire biodegradable resin composition mixed with the sawdust.
The content is preferably 45 parts, more preferably 30 to 40 parts. If this mixing amount is less than 25 parts,
There is a possibility that the effects shown in the above (A) and (A) by mixing sawdust may not be sufficiently obtained. On the other hand, the mixing amount is 4
If it exceeds 5 parts, the elasticity of the fixing member may be reduced, so that the fixing member may be easily broken when used.

The particle size of the above sawdust is 0.5 to 3000 μm
And more preferably 1 to 500 μm. If the particle size of the sawdust is less than 0.5 μm,
The above-mentioned "(a) Effect of increasing the decomposition rate" may not be sufficiently exhibited. On the other hand, if the particle size exceeds 3000 μm, the elasticity and strength of the fixing member may be reduced.

[0021] In the fixing member according to any one of claims 1 to 3, short fibers made of soda-lime glass may be further mixed in the biodegradable resin composition. The “short fibers” are mixed in the biodegradable resin composition for the purpose of reinforcement.
The mixing ratio of the short fibers can be appropriately selected according to the performance (elastic modulus and the like) of the biodegradable resin composition. Further, since the material of this short fiber is made of soda-lime glass, it is possible to hydrolyze it for a certain period of time. Therefore, even if this short fiber remains in a golf course or a park, it does not cause environmental destruction. That's why. Further, the biodegradable resin composition may further contain other additive components such as a bulking agent, a plasticizer, a release agent, an aggregate, a pigment, a dye, and a fragrance.

In the fixing member according to the first to third aspects, the angle formed by the back surface of the head and the leg is preferably in the range of 60 ° to 90 °, and most preferably 90 °. If the angle is less than 60 °, the force applied to the head when the fixing member is pierced tends to be non-uniform depending on the location, and the strength of the fixing member may be insufficient.

The method for producing a fixing member for a plant according to claim 4 relates to a preferable method for producing the fixing member according to claim 1 or 2. That is, a method for producing a plant fixing member comprising a substantially plate-shaped head and a substantially bar-shaped leg extending from the back surface of the head in a direction non-parallel to the back surface and having a sharp end on the opposite side of the head. Wherein the biodegradable resin pellet has a length that is 0.3 to 3.0 times the axial length of the biodegradable resin pellet, and is 0 to the diameter of the biodegradable resin pellet. .3 ~
At least one selected from a granular fertilizer and a granular humus having a width of 3.0 times is mixed to form a biodegradable resin composition, and the plant fixing member is integrally formed from the biodegradable resin composition. It is characterized by the following.

In the step of obtaining the biodegradable resin composition, it is preferable that "biodegradable resin pellets" and "particulate fertilizer and / or particulate humus" are preliminarily mixed, and this mixture is put into a kneader or the like. . In this kneader,
At an appropriate temperature according to the type of biodegradable resin, for example, 30
By stirring at ~ 200 ° C, the granular fertilizer and the granular humus collapse and are uniformly mixed with the molten biodegradable resin. Here, according to the above production method, the biodegradable resin pellets and the granular fertilizer and / or granular humus have similar sizes. Therefore, at the stage of charging the mixture into a kneader or the like, the proportion of each component in each part of the mixture is not easily biased. For this reason, even when a plurality of batches of the composition are manufactured from a large amount of the mixture, there is an effect that the component ratio of each batch can be made uniform.

In order to obtain the above effects, the granular fertilizer and / or granular humus has a length of 0.3 to 3.0 times the axial length of the biodegradable resin pellets, and The size has a width that is 0.3 to 3.0 times the diameter of the degradable resin pellet. A more preferable size has a length of 0.5 to 2.0 times the axial length of the biodegradable resin pellet, and 0.5 to 2.0 times the diameter of the biodegradable resin pellet. The size has a width of 2.0 times. When the relative size of the biodegradable resin pellets and the granular fertilizer and / or granular humus is outside the above range, the proportion of the relatively small component increases in the lower part of the mixture,
At the top of the mixture, the proportion of relatively large components increases. For this reason, there arises a problem that the component ratio in the obtained composition varies depending on from which part of the mixture the biodegradable resin composition is produced.

The above-mentioned "biodegradable resin pellets" refer to those obtained by forming the biodegradable resin described in the first aspect into a column shape. The size of the pellet is such that the diameter of the cylinder is 0.5 to 5 mm, and the axial length (axial length) is 0.5 to 5 mm.
It is preferably 10 mm, more preferably 1 to 3 mm in diameter and 1 to 5 mm in axial length. If the size of the pellets exceeds the above range, it takes time to melt the pellets at the time of mixing with other components, so that the production efficiency is reduced. If the size of the pellets is less than the above range, the working environment may be contaminated because the pellets are in the form of fine powder.

As the "particulate fertilizer", use is made of fertilizers and the like described in the description of the first aspect, which have a relative size to the biodegradable resin pellets and satisfy the conditions of the fourth aspect. can do.

The above-mentioned "granular humus" is, for example, a commercially available humus or the like, which is dried, pulverized, and then granulated by adding a spreading agent or the like. The size of the mulch after pulverization is preferably in the range of 0.5 to 3000 μm, more preferably 1 to 500 μm. If the size of the humus exceeds 3000 μm, the strength of the fixing member may decrease, and the fixing member may be easily broken at the time of piercing. On the other hand, the size of mulch is 0.5
At μm, the mulch is in the form of fine powder, which may contaminate the working environment during the period from pulverization to granulation. As the "spreading agent", can be melted at the mixing temperature with the biodegradable resin pellets or can break down the granular humus by the pressure applied during mixing,
What has biodegradability may be appropriately selected and used. For example, starch or a derivative derived from starch-based agricultural products, a modified polyvinyl alcohol-based resin having biodegradability, or the like can be used. Alternatively, the crushed humus may be mixed with a small amount of a biodegradable resin, and the resulting mixture may be used as the above-mentioned “granular humus”.

[0029]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described specifically with reference to examples. (1) Embodiment 1 As shown in FIG. 1, the fixing member A of this embodiment is an integrally molded article having a substantially nail-shaped outer shape.

The fixing member A has a substantially disk-shaped head (diameter: about 15 to 25 mmφ, thickness: about 2 to 3 mm, weight:
About 1 to 3 g) 1 and a substantially bar-shaped leg (diameter; about 5 to 10 mm) extending from substantially the center of the back surface and perpendicular to the back surface.
φ, full length; about 100-120 mm, weight; about 5-20
g) 2). Also, the lower end 21 of the leg 2 is
Pointed like a nail. As shown in FIG. 2, a reinforcing rib R may be provided between the back surface of the head 1 and the upper part of the leg 2. This reinforcement is particularly useful when the legs are made thinner (for example, when the diameter is about 5 to 6 mmφ).

Next, the fixing member A configured as described above
A brief description will be given of a method of manufacturing the device. First, the following materials were stirred and mixed at normal temperature and normal pressure. Biodegradable resin pellets; diameter 1.5 mm, shaft length 3 mm
[Trade name “Mater-Bi”; a product made mainly from starch, manufactured by NOVAMONT Co., Ltd., sold by Nippon Synthetic Chemical Industry Co., Ltd.] Granular fertilizer: 5 mm long, 3 mm wide cocoon-shaped , Phosphorus and potassium). Here, the above-mentioned granular fertilizer has a total amount of 10
An amount of 3 parts to 0 parts was used.

Next, the mixture was put into a kneader,
At 50 to 160 [deg.] C., the above particles were uniformly mixed with the above while breaking the above particles to obtain a biodegradable resin composition. Then, 150 to 16 is added to a molding die heated to about 45 to 50 ° C.
The above-mentioned resin composition kept at 0 ° C. is filled, and 60 kg / c
Compression molding was performed at a pressure of m ² for about 1 hour. After cooling for several minutes, annealing was performed at 60 ° C. for about 1 hour to further discharge the water-containing component, thereby obtaining a fixing member A. In the obtained fixing member A, fine particles of fertilizer were observed at a position very close to the fixing member A, but it was uniform light brown when viewed from a remote position. The fixing member A can be formed by injection molding. In this case,
In order to enhance fluidity, the temperature of the resin raw material is set to 150 to 165.
It is preferable to inject into a molding die at a temperature as high as about ° C.

FIGS. 3 and 4 show examples of use of the fixing member A. That is, as shown in FIG. 3, after a predetermined lawn S is planted at a desired location, the fixing member A is attached to each corner and center of the lawn S from the lower end 21 of the leg 2. Stab. In this embodiment, the place where the turf S is to be planted is composed of the soil 5 which is firmly tightened and the relatively soft upper layer 5a laid thereon, and the turf S is arranged on the upper layer 5a. Have been. As shown in FIG. 4A, the stabbed fixing member A is such that the head 1 presses the turf S from above, and the leg 2 penetrates the turf S into the soil 5. State.

The leg 2 which is mostly located in the ground
Is decomposed naturally or with the help of bacteria or the like in a relatively short time. As shown in FIG. 4B, the fixing member A of the present embodiment has about 80
% Was decomposed. Further, as shown in FIG.
Years later, leg 2 was almost completely disassembled. Incidentally, when the fixing member A of the present embodiment was used, compared with the case of using the fixing member a manufactured in the same manner as in the present embodiment except that no particulate fertilizer was mixed, the lawn S Due to the rapid growth of roots, the time taken to take root has been shortened. Also, in the above-ground part, the growth of the turf leaves was good.

On the other hand, the head 1 is decomposed under the influence of rainwater or the like over a certain period of time. For this reason, FIG.
As shown in (b), about six months later, about 60% of the head 1 remained. About one year later, as shown in FIG. 4C, about 30% of the head 1 remained. However,
The head 1 is originally disc-shaped, and has a sharp corner because biodegradation has progressed to a certain extent, and since the material itself has flexibility, it is unlikely to be an obstacle when walking humans. . Further, the remaining head 1 may be collected together with the turf mowing by a lawnmower or the like. Further, since the remaining head 1 is mainly composed of starch, it may be a food for insects, birds and small animals. However, if the head 1 is made thinner and the amount of the biodegradable resin composition constituting this portion is reduced, the head 1 can be disassembled almost simultaneously with the legs 2.

As described above, according to the present fixing member A, the lawn S can be firmly fixed until it takes root, and the growth of the lawn S is promoted by the fertilizer mixed into the fixing member A. Can be. Moreover, it is not necessary to collect the fixing member A after the lawn S has taken root. Further, since the fixing member A is an integrally molded product, it can be manufactured at low cost.
Furthermore, since the fixing member A is colored light brown due to the mixing of fertilizer, the appearance is not spoiled during use.

(2) Embodiment 2 The fixing member A ₁ of this embodiment is an example in which the fixing member A of Embodiment 1 further contains sawdust and humus. Briefly the method of manufacturing the fixing member A _1.

In addition to the materials used in Example 1 and
The following materials were stirred and mixed at normal temperature and normal pressure. Granular humus; spherical sawdust having a diameter of 2.5 mm; particle size of 10 to 500 μm Here, the above-mentioned granular humus is obtained by crushing a commercially available humus to a size of about 50 to 150 μm on average,
This was granulated by adding 5 to 10% by weight of starch. Further, the above-mentioned material is a total amount of the above-mentioned 1
Amounts of 2, 3, and 35 parts were used for 00 parts, respectively.

Next, this mixture was put into a kneader,
At 50 to 160 [deg.] C., the above particles were uniformly mixed while breaking the above particles to obtain a biodegradable resin composition. Then, compression molding and annealing were performed in the same manner as in Example ₁ to obtain a fixing member A1. Resulting in the fixing member A ₁ is at a position in close proximity but particulate fertilizer was observed, was a uniform reddish brown insofar as viewed from a remote location.

In the fixing member A ₁ , decay is more likely to occur due to the mixed sawdust and humus compared to the fixing member A of the first embodiment. Also, there is air in the fixing member A surface and inside like sawdust in _one. Accordingly, fixing member A ₁ is decomposed faster than the fixing member A of Example 1, in particular degradation rate of approximately 2-fold was obtained. That is, in the main fixing member A _1, any part of the head and legs, about the start of use 3
In about a month, it was largely decomposed and ragged. After about six months, the legs were almost completely decomposed, and only about 10% of the head remained.

In this example, the amount of the biodegradable resin composition used is reduced by the amount of sawdust used, so that the raw material cost is reduced and the manufacturing cost is reduced. Moreover, since the effect of modifying the soil is exhibited by leaf mold mixed in the fixing member A _1, growth of grass body was even better than Example 1.
Therefore, even though the rate of degradation of the fixing member A ₁ is improved, the fixing member A ₁ is able to take root reliably Shibatai before losing plants fixing function.

The present invention is not limited to the specific embodiments described above, but may be variously modified within the scope of the present invention according to the purpose and application.

[0043]

The fixing member for plants of the present invention comprises a fertilizer and / or
Alternatively, since the biodegradable resin composition contains humus, fertilizer and / or humus is released as the decomposition of the fixing member progresses. As a result, the growth of the plant fixed by the fixing member is promoted, and effects such as shortening the period until the plant takes root are obtained. Also, if the fertilizer or humus has a color similar to the soil, or if it is of the same system as the soil and has a slightly darker color than the soil, the fixing member can be applied to the soil without coloring with other pigments, etc. Since a similar color can be obtained, the fixing member becomes less conspicuous at the time of use, so that the appearance is improved. According to the method for producing a fixing member for plants of the present invention, the biodegradable resin pellets and the granular fertilizer and / or granular humus are made to have similar sizes to each other. There is an effect that the component ratio for each can be made uniform.

[Brief description of the drawings]

FIG. 1 is a perspective view illustrating a fixing member A according to a first exemplary embodiment.

FIG. 2 is a perspective view illustrating a modification of the fixing member according to the first exemplary embodiment.

FIG. 3 is a perspective view illustrating a method of using the fixing member A according to the first exemplary embodiment.

FIGS. 4A and 4B are cross-sectional views illustrating a method of using the fixing member A according to the first exemplary embodiment, wherein FIG.
Shows the state about six months after the start of use, and (c) shows the state about one year after the start of use.

[Explanation of symbols]

A, A ₁ Fixing member 1 Head 2 Legs 5 Soil R Reinforcing rib S Turf

Claims (4)

[Claims] 1. A head comprising a substantially plate-shaped head, and a substantially bar-shaped leg extending from the back surface of the head in a direction non-parallel to the back surface and having a sharp end on the side opposite to the head. A fixing member for a plant, wherein the leg portion is integrally formed using a biodegradable resin composition, wherein the biodegradable resin composition contains a fertilizer. 2. A substantially plate-shaped head, and a substantially rod-shaped leg extending from the back surface of the head in a direction not parallel to the back surface and having a sharp end on the opposite side of the head. A fixing member for plants, wherein the legs are integrally formed using a biodegradable resin composition, wherein the biodegradable resin composition contains humus. 3. The plant fixing member according to claim 1, wherein the biodegradable resin composition further contains sawdust. 4. A plant fixing member comprising a substantially plate-shaped head and a substantially bar-shaped leg extending from the back surface of the head in a direction non-parallel to the back surface and having a sharp end on the side opposite to the head. A biodegradable resin pellet, having a length of 0.3 to 3.0 times the axial length of the biodegradable resin pellet and having a diameter of the biodegradable resin pellet. A biodegradable resin composition by mixing at least one selected from a granular fertilizer and a granular humus having a width of 0.3 to 3.0 times with respect to the biodegradable resin composition; A method for producing a plant fixing member, wherein the fixing member is integrally formed.