JPS6350394B2 - - Google Patents

Description

[Detailed description of the invention]

This invention mainly relates to a spray material for spraying on farms in cold regions or during the cold season. In recent years, in order to shorten the planting period in cold regions,
Alternatively, in order to accelerate growth, it is necessary to quickly remove snow and raise soil temperature early, and one known solution to these problems is to spread snow melting material on the snow surface. Among them, as a black powder,
Spreading carbon powder is known to absorb solar heat and melt snow. However, known carbon powder is extremely fine and has a low specific gravity, so when it is sprayed, it scatters and not only contaminates the body and clothes of the worker who is spraying it, but also makes the work environment worse by inhaling the fine powder. It contaminates surrounding houses and laundry, harms people and livestock, and is washed away by water and pollutes rivers black, making it almost impossible to use near human houses or rivers. As a snow melting material, it is required to have a high heat absorption rate, excellent mechanical dispersibility, no wind scattering, no harm to plants, soil, humans and livestock, and the ability to be mass-produced. In order to achieve these objectives, the applicant first developed a snow melting material and a soil temperature increasing agent made by burning old foundry sand, and previously filed patent applications No. 56-029572 and No. 56-
Although it has been filed as No. 188270, these earlier applications had irregularities in the stable supply of raw materials and the quality of raw materials, and had some drawbacks in heat absorption rate. Therefore, this invention improves these drawbacks, increases the heat absorption rate, eliminates uneven quality of the product, and improves the heat absorption rate.
Moreover, like the previous application, the purpose is to obtain a product that can be mass-produced without being dispersed by wind, without being contaminated by wind, or flowing into rivers, and without having any negative impact on plants or soil. . In this invention, the surface of each grain of mineral granular material that does not elute harmful substances, such as natural sand, mining sand, clinker, and calcium silicate fertilizer, is coated with a carbonized synthetic resin layer containing a black pigment. This is a black fine particle spray material for agricultural use, characterized in that 95% or more of the particle size is within the range of 14 to 270 mesh. Other inventions include natural sand, mineral sand, clinker, calcium silicate fertilizer, SiO ₂ , CaO
Mineral granular materials mainly composed of After adding about 5% by weight and mixing uniformly, the water-soluble synthetic resin is fired and carbonized by heating at 400 to 800°C in a low oxygen condition and baked onto the surface of each mineral granular material. This is a method for manufacturing a black fine particle spray material for agricultural use. In order to specifically explain the content of the present invention, an explanation will now be given based on examples. Example 1 Carbon was used as a pigment in river sand having the particle size distribution shown in Table 1 and the chemical composition shown in Table 2,
Black pigment liquid suspended with surfactant (PIG DIE BLACK LN- manufactured by Resino Color Industries Co., Ltd.)
720) by 1% by weight, water-soluble phenol resin (phenol formaldehyde methanol [AV Light Resin manufactured by Asahi Yokuzai Kogyo Co., Ltd.]) by 0.1% by weight, and water by 5% by weight. After mixing these evenly, the water is evaporated by heating at 500°C for 30 minutes in an oxygen-poor atmosphere, and the water-soluble phenol resin is carbonized, so that the surface of each grain of river sand contains black pigment. A product is obtained by coating with a carbonized synthetic resin layer.

【table】

[Table] Table 3 shows the content of specific harmful substances stipulated in the Act on the Prevention of Soil Contamination, etc., together with the standard values, for the spray material manufactured by the method shown in the above-mentioned example.

[Table] We also conducted elution tests for harmful substances derived from synthetic resins.
JISK-0102, 20.2 antipyrine method, JISK-0102,
21.1 The results of each test using the acetelacetone method are shown in Table 4.

[Table] Example 2 A commercially available calcium silicate fertilizer having the particle size distribution shown in Table 5 (Kumiai Magnesium Silicate Lime No. 1 manufactured by Kawatetsu Mining Co., Ltd.) However, since the above commercially available calcium silicate fertilizer is dry, (Aqueous pigment and water-soluble phenolic resin were mixed in 15% to 15% water, and then mixed with calcium silicate fertilizer.) was treated in the same manner as in Example 1 to obtain a product.

[Table] Table 6 shows the elution test of harmful substances of the product manufactured by the method of Example 2.

[Table] Table 7 shows the elution ratio of fertilizer components between the calcium silicate fertilizer, which was the starting material in the above example, and the processed product, which was analyzed based on the fertilizer analysis method.

[Table] Example 3 Cyupora granulated slag, or slag, having the particle size distribution shown in Table 8, the chemical composition shown in Table 9, and the fertilizer components according to the fertilizer analysis method shown in Table 10 was used as a mineral granular material. , and the same water-based black pigment and water-soluble phenolic resin as in Example 1 were added to the mineral particulate material at a weight ratio of 1% and 0.1%, respectively.
After mixing 10%, the product was heated at 500°C for about 30 minutes in low oxygen conditions. When the water-soluble phenolic resin and the water-based pigment are mixed, if the pulverized Kupora slag is sufficiently impregnated with water, there is no particular need to add water. On the other hand, for dry products, the additives were first mixed with a slightly larger amount of water, and then mixed with finely pulverized Kupora slag to obtain the product.

【table】

【table】

[Table] In the elution test of harmful substances after processing in Example 3, results similar to those in Table 6 were obtained.
This data display is omitted. Next, amounts equivalent to 30, 50, 70, and 100 kg of Examples 1, 2, and 3 were sprinkled on white paper in an area of 10 ares, and the reflectance was determined using a solar photometer. This is shown in Table 11, and the attached figure is a graph of this.

[Table] Known snow melting materials (mixture of Cyamide Lime and finely powdered carbon, particle size 10-32 mesh)
Furthermore, for Examples 1, 2, and 3, an experiment was conducted by immersing these products in groundwater to see if the attached black pigment would separate from the mineral particulate matter in water. I couldn't see it. As mentioned above, in this invention, the mineral granular starting material used is one that does not elute harmful substances, and the colorant is a black pigment such as carbon. Even if the ingredients themselves contain harmful substances, such as water-soluble phenolic resins used as binders, which do not harm humans or animals, all harmful substances are vaporized and removed during carbonization. Therefore, this product is harmless to farmland, forests, agricultural products, trees, and humans and livestock. In addition, since the particle size distribution is as described above, it can be easily dispersed mechanically, and it is not so fine that it can be dispersed by the wind, so it is much coarser than the normal Kanto loam layer soil, and the wind speed is 10 m/sec. It can be sufficiently sprayed within this range, and there are no restrictions on the weather at the time of spraying. Furthermore, since the coloring material in each particle does not separate, it does not contaminate the skin or clothes of the worker, and does not scatter and contaminate surrounding houses or laundry. In addition, as a method for manufacturing the product of this invention,
The starting materials are river sand, other rock sand, Kyupora slag, etc., which exist in almost inexhaustible quantities, and calcium silicate fertilizer is extremely cheap, so it is easy to obtain, and the temperature is 400 to 800 degrees Celsius, with little oxygen. By heating, the pigment for coloring is firmly fixed on the surface of each particle of the mineral granular material, and the water-soluble phenolic resin that serves as the binder is also carbonized and becomes black, and is incorporated into the resin. It has the effect of dispersing and removing harmful substances. Moreover, since the product of this invention exhibits the reflectance as described above, it can of course be used as a snow melting material in fields, golf courses, ranches, etc.
As a material to increase soil temperature when growing crops in cold regions,
It can be sprayed on the ground surface, making it possible to grow warm-temperate plants in cold regions, and can also accelerate the growing time of spring-sown or spring-planted crops, promote growth, and contribute to increased production. It can also encourage the growth of tropical plants in warm regions. Examples 2 and 3 not only have snow melting effects and soil temperature raising effects, but also maintain properties as calcium silicate fertilizers, and after snow melting and crop growth, they can be used as slow-release calcium silicate fertilizers. Maintain effectiveness. The carbonized synthetic resin of the specific and second invention in this application is not necessarily a water-soluble phenolic resin, but may be a water-soluble melamine resin, as long as it can be mixed well with the water-based black pigment. It may also be an emulsion of other resins.

[Brief explanation of the drawing]

The figure is a graph showing the amount of spraying and reflectance of the first invention.

Claims (1)

[Scope of Claims] 1. The surface of each grain of mineral granular material that does not elute harmful substances, such as natural sand, mine sand, clean car, calcium silicate fertilizer, etc., is coated with a carbonized synthetic resin layer containing a black pigment. Yes, these grain sizes are 14
A fine black particle spray material for agricultural use, characterized in that 95% or more of the total amount is within the range of 270 to 270 mesh. 2. Sieve mineral granular materials whose main components are SiO ₂ , CaO, etc., such as natural sand, mine sand, clean car, calcium silicate fertilizer, etc., into a range of 14 to 270 mesh, and add aqueous black pigment to these by weight ratio. about 1
%, about 0.7% by weight of the water-soluble synthetic resin and about 5% by weight of water, mixed uniformly, and then heated at 400 to 800°C in a low oxygen condition to form the water-soluble synthetic resin. A method for producing a black particulate spray material for agricultural use, which is characterized by burning and carbonizing the material and baking it onto the surface of each mineral granular material.