JP3552304B2 - Rock wool molding medium - Google Patents

Description

[0001]
[Industrial applications]
TECHNICAL FIELD The present invention relates to a culture medium for cultivating greenhouses such as vegetables or planting plants on sloped side surfaces such as a road.
[0002]
[Prior art]
Conventionally, granulated rock wool has been used as a medium for vegetables or the like, spread over a flat box, or granulated rock wool in a bag as shown in Japanese Utility Model Application Laid-Open No. 2-36956. The method of laying in a flat box is to take out from the bag packed with granulated rock wool and spread it to a uniform thickness, so that fine powder of granulated rock wool irritates sweaty skin, masks, etc. Is the way. In the method disclosed in Japanese Utility Model Application Laid-Open No. 2-36956, the problem caused by the fine powder of the granulated rock wool can be solved. In addition, there is a problem that it is not possible to maintain a uniform thickness along the inclined side surface because it moves freely, and sowing and planting are hindered.
[0003]
[Problems to be solved by the invention]
An object of the present invention is to solve the above problems and to provide a rock wool molding medium which maintains excellent water retention and air permeability of granulated rock wool and is easy to handle without dust.
[0004]
[Means for Solving the Problems]
The invention of claim 1, which solves the above-mentioned problem, is a rock wool molding medium in which granulated rock wool is bonded to each other with an adhesive, and is characterized by having no irritating feeling and good handleability.
[0005]
The invention according to claim 2 is a rock wool molding medium in which granulated rock wool bonded with an adhesive is stuck to a root-permeable nonwoven fabric, and there is no movement of the granulated rock wool, and the handleability is good. It is also characterized by good water retention and suitable for the roots of crops and having flexibility.
[0006]
The invention of claim 3 is a rock wool molding medium in which granulated rock wool bonded with an adhesive is stuck to a non-conductive nonwoven fabric.
[0007]
Hereinafter, the present invention will be described.
The granulated rock wool of the present invention is obtained by melting a raw material such as slag, siliceous rock, basalt, and limestone, fibrillating, collecting, laminating rock wool with a granulator or the like to a predetermined amount, and then scraping the rock wool. It is granulated to a predetermined diameter while rotating by equipment such as trommel, or granulated to a predetermined diameter by a hammer mill, refiner, or the like, and granulated to a predetermined diameter by a kneader, blender, or the like. The particle size used in the rock wool molding medium of the present invention is 1 to 25 mm, the bulk density is 0.08 to 0.27 g / cm ³ , preferably the particle size is 2 to 7 mm, and the bulk density is 0.13 to 0. .15 g / cm ³ . The reason for this is that if the particle size is smaller than 1 mm, there is a disadvantage that the gas phase decreases, and if it is larger than 25 mm, the liquid layer decreases. When the bulk density is less than 0.08 g / cm ³ , the granularity is easily broken, and when the bulk density is more than 0.27 g / cm ³ , the elongation of roots is hindered, the amount used per unit area increases, and the cost of cultivation materials increases. That's why.
[0008]
Adhesives used for bonding granulated rock wool include starch, water-soluble adhesives such as polyvinyl alcohol, synthetic rubber-based adhesives such as SBR and CR, and thermosetting or thermoplastic materials such as phenolic resins and melamine resins. An adhesive is used.
[0009]
The following methods can be used to apply the adhesive to the granulated rock wool: a method in which an adhesive solution is impregnated into the granulated rock wool, mixed, and dried and cured. A water-soluble adhesive such as starch or polyvinyl alcohol is suitable for this method. The amount used is 8 to 13 parts by weight based on 100 parts by weight of granulated rock wool. Since the rock wool molding medium obtained by this method is hard and plate-shaped, it is suitable for cultivation beds used for fruits and vegetables such as tomato, cucumber and strawberry, and cut flowers such as rose and gerbera.
[0010]
A method in which an adhesive solution is sprayed on granulated rock wool and dried and cured. In this method, any of a water-soluble adhesive, a synthetic rubber adhesive, and a thermosetting adhesive can be used. However, when a synthetic rubber adhesive such as SBR or CR is dissolved or dispersed in a solvent and sprayed in a mist state, A rock wool molding medium that is more flexible than other adhesives can be obtained. The rock wool molding medium is suitable for use in turf, pasture, greening of sloped soil side and the like.
[0011]
When melting and fibrillating raw materials such as slag, siliceous rock, basalt, and limestone, an adhesive is sprayed on rock wool fibers, the adhesive is granulated in an uncured state, and then dried and cured. Thermosetting adhesives such as phenolic resins and melamine resins are suitable for this method. The rock wool molding medium obtained by this method has good water retention, air permeability, and flexibility, and thus is suitable for use in turf, grass, greening of sloped soil side surfaces, and the like.
[0012]
The root-permeable cloth used in the second aspect of the present invention is a cloth in which the roots of a plant grown on a granulated rock wool medium can set roots on the ground through the cloth. Regardless of whether the fabric is a woven fabric or a nonwoven fabric, it is sufficient that the rock wool passes through the roots and the granulated rock wool does not easily come out. As the root-permeable cloth, there is a cloth having a light transmittance of 80% or more, for example, Pathlight of Unitika Co., Ltd. Another index is that the diameter of the pores of the fabric described in Japanese Utility Model Application Laid-Open No. 2-36956 is 500 to 1000 μm.
[0013]
The impervious root cloth used in the invention of claim 3 is a cloth that does not allow the root of a plant elongated in a granulated rock wool medium to pass through the cloth. The fabric may be a woven fabric or a non-woven fabric as long as the roots and granulated rock wool do not easily come out. The non-conductive cloth having a light transmittance of less than 60% includes, for example, Lovesheet 20507 FLD manufactured by Unitika Ltd. Another index is that the pore diameter of the fabric described in Japanese Utility Model Application Laid-Open No. 2-36956 is 10 μm or less. Alternatively, a chemical such as a copper compound may be applied to the cloth to prevent roots. In this case, the diameter of the pores of the fabric may be somewhat larger than 10 μm.
[0014]
The application of the granulated rock wool to the root-permeable fabric or the impervious root fabric may be performed at the same time as bonding the granulated rock wool with an adhesive or after bonding the granulated rock wool with an adhesive. Alternatively, it may be adhered to an impervious fabric with an adhesive.
[0015]
[Action]
Since the rock wool molding medium of the present invention has granulated rock wool and granulated rock wool bonded by an adhesive, the granulated rock wool does not move to a lower position even when applied on an inclined ground, and the root-containing cloth or Those to which the impervious fabric is adhered are particularly convenient to handle and work efficiency is remarkably improved. Furthermore, it is possible to freely select and manufacture from a hard plate to a flexible one by a method of applying an adhesive, so that vegetables and plants can be grown in a state most suitable for the place such as a slope, a roof, a roof, etc. .
[0016]
【Example】
[Example 1]
100 parts by weight of granulated rock wool (particle diameter: 2 to 7 mm, bulk density: 0.13 g / cm ³ ) obtained by melting and granulating a raw material mainly composed of slag by a known method, starch (Sansei Co., Ltd.) After mixing 10 parts by weight and 7,000 parts by weight of water in a kneader for 5 minutes, put in a mold having a thickness of 20 mm, a width of 300 mm, and a length of 600 mm to a moisture content of 150%, and then dry at 85 ° C. A rock wool molding medium of the present invention having a thickness of 20 mm, a width of 300 mm, a length of 600 mm and a bulk density of 0.37 g / cm ³ was obtained.
[0017]
[Example 2]
A commercially available 300 mm-wide root-permeable nonwoven fabric (passlight transmittance: 85%, manufactured by Unitika Ltd.) is moved at a speed of 1 m / min, and granulated rock wool (particle size: 2 to 7 mm, bulk density: 0.13 g) is moved from above. / Cm ³ ) at a rate of 2.5 kg / min while applying a synthetic rubber-based adhesive (trade name: GZ-5, manufactured by Konishi Co., Ltd.) to the granulated rock wool at a rate of 20 g / m ² (solid content). A rock wool molding medium of the present invention having a sprayed thickness of 30 mm was obtained at a given ratio.
[0018]
[Example 3]
A commercially available non-conductive nonwoven fabric having a width of 300 mm (Lab sheet 20507 FLD manufactured by Unitika Ltd., light transmittance: 45%) is moved at a speed of 1 m / min, and granulated rock wool (particle size: 2 to 7 mm, bulk density: 0. 13 g / cm ³ ) at a rate of 2.5 kg / min while applying a synthetic rubber-based adhesive (trade name: GZ-5, manufactured by Konishi Co., Ltd.) to the granulated rock wool at 20 g / m ² (solid content). To obtain a rock wool molding medium of the present invention having a sprayed thickness of 30 mm.
[0019]
[Example 4]
1 kg of granulated rock wool (particle diameter: 2 to 7 mm, bulk density: 0.13 g / cm ³ ) obtained by melting and fibrillating a raw material mainly composed of slag by a known method is put into a blender, and a binder (composition: phenol) Resin 20% by weight (manufactured by Gunei Chemical Co., Ltd.), surfactant 5% by weight (manufactured by Matsumoto Yushi Co., Ltd.), water 75% by weight) are sufficiently blended while spraying, and are 30 mm thick, 300 mm wide. It was molded to a length of 10 m and dried and cured at 250 ° C. for 13 minutes to obtain a rock wool molding medium of the present invention.
[0020]
[Example 5]
When a raw material mainly composed of slag is melted and fiberized by a known method, a binder (composition: 20% by weight of a phenolic resin (manufactured by Gunei Chemical Co., Ltd.)) and 5% by weight of a surfactant (Matsumoto Yushi ( Co., Ltd.) and water (75% by weight) are sprayed with 2.5% by weight (solid content) of the weight of rock wool fiber, cut with a refiner to a particle size of 10 mm or less in an uncured state, and then sufficiently mixed with a blender. After granulation, the mixture was molded into a thickness of 30 mm, a width of 300 mm, and a length of 10 m, and cured at 250 ° C. for 13 minutes to obtain a rock wool molding medium of the present invention.
[0021]
[test]
A Kentucky 31 fescue (10 g) was sprinkled with 10 g of a culture solution of 1 g / l of ammonium sulfate and germinated on the rock wool molding medium (thickness 30 mm, width 300 mm, length 10 m) of the present invention obtained in Example 2 and germinated. 6 g of Sakata seeds were sown. The seedlings were raised in a greenhouse, and when the roots extended from the bottom of the medium, the medium was attached to the side of the soil at an inclination angle of 30 °, and the four corners were fixed with nails and watered.
Two weeks later, the upper roots of the sloping land also extended into the soil like the lower roots, and it was confirmed that even in the upper part of the sloping ground, the granulated rock wool was effectively working as a medium without moving. Was.
[0022]
【The invention's effect】
As shown in Examples 1 to 5, the rock wool molding medium of the present invention uses a plate while maintaining the excellent air permeability and water retention of the granulated rock wool because the granulated rock wool is bonded to each other with an adhesive. It can be handled in the form of a sheet or a sheet, and the generation of dust from rock wool is small, so that extremely excellent workability can be obtained. In addition, the rock wool molded medium of the present invention can be selected from a plate-shaped hard medium having a high flexibility and a medium adapted to the base to be constructed. Since the medium maintains a uniform thickness even on an inclined ground, it may hinder seeding and planting. Never do. In addition, when using a non-woven nonwoven fabric or a rock wool molding medium in which granulated rock wool is bonded to a non-conductive nonwoven fabric as necessary, handleability is more excellent, and when it is better for plants to take root on the foundation to be constructed Alternatively, there is an effect that each case can be adapted and used in a bad case.

Claims (3)

A rock wool molding medium, wherein the granulated rock wool is bonded to each other with an adhesive. A rock wool molding medium, wherein granulated rock wool bonded with an adhesive is adhered to a root-permeable cloth. A rock wool molding medium, characterized in that granulated rock wool bonded with an adhesive is adhered to a non-conductive fabric.