JPS5974928A - Plant growing soil material and production thereof - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a soil material for growing plants using mineral fibers and a method for producing the same.

Item 21 Materials for growing plants are required not only to not impede the germination and growth of plants, but also to have good ventilation f1 and good water retention. Conventionally, it has been proposed to use artificial mineral U&cloth as a material that satisfies such requirements. (Refer to Japanese Patent Publication No. 41-12642) In this W plan, artificial mineral fibers are mainly used as culture soil, mixed with clay soil to give porosity, and mixed with sandy soil to increase water adsorption and retention. This is to improve soil quality. However, in recent years, with the progress of mechanization in agriculture, it has become more common for seedlings to be raised and grown using soil molded into a certain shape. If the above-mentioned molded article of artificial mineral fiber is used as it is as the molded i'+ soil, a problem will arise in terms of water retention. In other words, the conventional artificial U1 fiber i11
Since the molded body is mainly used as a construction material, it is given water repellency (E+).The molded body has a water repellency (E+), so if it is shriveled and has no water retention capacity, it is extremely low, so if it is used as a potting soil, plants will It is unable to absorb moisture, resulting in poor growth.

The present invention takes this point into consideration, and the first invention t of A.
A soil material for growing plants is characterized by being made of a molded inorganic fiber containing a nonionic surfactant and/or a polyhydric alcohol.

The inorganic fibers used in the present invention include blast furnace slag, Genbuwaka, andesite, and luminescent line≠:r? Rock wool or glass wool, which is made by dissolving natural minerals and making it into a uli cloth, is used.

The first type of inorganic fibers are synthetic polymers such as phenol resin, melamine resin, polyvinyl alcohol, polyvinyl acetate, starch, etherified starch, natural polymers such as glue, gelatin, and water glass. Bonded and molded using an inorganic binder.

In the binder world, it is preferably 0.5 to 107% by weight, preferably 1 to 0.8 to 5% by weight. At 0.5% by weight, the molding strength is 111%, and if it exceeds 10% by weight, it is unfavorable from the standpoint of water permeability and economy.

Examples of nonionic surfactants that can be mixed into such molded inorganic fibers include 1, alkyl polyoxynidylene ether, alkylphenyl poly 4-diylene ether, alkyl carbonyl A-1 sibori dylene, N
, N-di(polyAxyT-dylene) alkanamide, fatty acid polyhydric al]ol 1-sual, fatty acid polyhydric al''-ruboli Δ21-di-L-dylene ether, fatty acid sho''sugar ester, fatty acid heptanoglyceride, N, Representative examples include N-di(alnoconol)alkanamide and the like.

In addition, polyhydric alcohols include ethylene glycol,
Propylene glycol, 1-rimesalene glycol, 1
．． 2-butanediol, 1,3-butanediol, 1,
Typical examples include 4-butanediol, glycerin, butane-1-lyol, polyethylene glycol, polypropylene glycol, volyl alcohol, and diglycerin.

Mata, the density of the molded product is 0 to 2! i0k tJ /
m'l, preferably 100 to 150 kg/m3 (X070kg If it is less than 7m3, the balance between water retention and ventilation will be disrupted, and plant growth will not be good.150KI
If it exceeds J/m3, the monthly incidence rate will worsen.

These nonionic surfactants and polyhydric alcohols improve the water retention of molded inorganic fibers.

Anionic, cationic, and amphoteric interfacial agents can be considered, but cationic ones are used in the production of rock wool molded products. V) phenolic resins flocculate when mixed with fat aqueous solution, and these are u)'? This is unsuitable because it may cause problems with germination of plant seeds, or floating roots may not penetrate into the fibers, resulting in a floating state. A cucumber germination test (1 week in July) was conducted with the point W (4 CJ Ru 6). Put cotton GOg in a petri dish (9 mm φ x 2 am), make a hole for seeding, and grow cucumbers. After sowing the seeds, add various active agents so that the surfactant concentration is 0.5%, add 70 ml of water, and boil at 113°C (27"C).
), constant 4 (70%) below ζ) between IJ, /I f21
From 11th to 7th B, the plants were placed outdoors in a greenhouse, and the seeds were seeded twice a day, and they germinated (55 leaves appeared).
Observe the situation and take a look. The results are shown in Table 1.

In addition, tests were conducted on the water retention properties of each type of surfactant added to the molded inorganic fibers. Rock wool (layered cotton) was uniformly sprayed with a 1.5% phenol resin aqueous solution, filled into a mold molding frame, and heated in a small Yuta furnace. i
A rock wool molded product was made by curing at a temperature of 250°C for 8 minutes.The addition rate of each surfactant at this time was -(50%) relative to the f-norm resin. .

Cut this molded product into 5 (l m mφ x 50 mm),
Fill a cylindrical plastic container, add 200 cc of water from one part, measure the amount of water that permeates from the bottom, and calculate the difference as a ratio of 1. The water retention rate was determined from s +. The results are shown in Table 2.

Table 2 The amount of the hydrophilicity improver J'3L:J used in the present invention is 0.05 to 5% by weight, preferably 0.3 to 1% by weight based on the amount of fabric without molding. is appropriate. If it is less than 0.05% by weight, there is no effect, and if it exceeds 5% by weight, no improvement in hydrophilicity is observed and the bonding properties deteriorate.

The 2nd Light 4 relates to the method for manufacturing the material mentioned in the 1st defense above, and its gist is that molten minerals are compressed by centrifugal force and/or fluid pressure, and molded into layers with a binder. 1. Mixing the nonionic surfactant J3 and/or polyhydric alcohol with the binder or spraying it separately from the binder onto the fiber surface. This is a product made by a cultivator for growing plants.

In other words, conventionally, inorganic fibers are formed by pulverizing molten minerals into fibers by centrifugation and/or fluid pressure, and then binding them with an aqueous phenol resin solution, etc. J,-)41 carried out in which a binder is sprayed and impregnated, and the binder is heated and cured while being held in a certain shape.However, in the present invention, a nonionic surfactant and/or polyhydric alcohol is added to this binder. These are mixed or sprayed onto the fiber surface separately from the binder.

By doing this, the mixing state of the hydrophilicity improving agent with the inorganic fibers becomes uniform, and uniform hydrophilicity and water retention fl can be obtained in any part of the molded article. However, since it can be made with LJ without any simple improvement compared to the conventional molding method 1, it does not require any special size, and excellent products can be obtained without requiring a special culm. There are characteristics that can be used.

Next, examples will be described.

Example 1 In melting blast furnace slag and converting it into C fibers by centrifugal force, 71 containing 50% poly:4xyethylenenonylfur-r-nyll--chill as a nonionic surfactant was used.
Knoll resin was sprayed at a ratio of 1.5% to the fibers to form a layered molded product with a density of 100 mm/III and a thickness of 100 mm. Its water retention rate was 86.5% by volume, and the time it took to sink into +11 filtrate (permeability) after being left on the water surface was 41 seconds. When I planted 4111 cucumber seeds in this 5cm square, they germinated with a germination rate of 100% after one week, and the growth length of the stem was 2.3cm.
There were ~3 dragons, and there were no floating roots and the leaves were in good condition.

Example 2 A molded article was made using polyhydric alcohols sorbyl 1 to 1 in place of the surfactant in Example 1.

As a result of the same germination test as in Example 1, the germination rate was 90%, the growth length of the stem was 2.3 to 3.5 m (2.3 to 3.5 m), there were no floating roots, and the leaves were in good condition θf. r, the water retention rate of the molded body was 83% by volume.

Q’r　i’l Applicant New l” book ¥! J Tetsu Kagaku Kamiawa Co., Ltd. 71 Agent Patent Attorney Hidetake Komatsu

Claims (2)

[Claims] (1) A cultivating soil material for growing plants, characterized by comprising a molded inorganic fiber containing a nonionic surfactant and/or a polyhydric alcohol. (2) Applying centrifugal force and/or fluid pressure to molten minerals.”
When it is made into fibers and formed into layers with a binder,
1. Manufacture of cultivating soil material for plant growth called "Ji"li, which involves heating a nonionic surfactant and/or polyhydric alcohol with a binder or spraying it on the fiber surface separately from the binder. Law.