JP6671777B2 - Herbicide composition - Google Patents

Description

  The present invention relates to a herbicide composition containing sodium chlorate as a herbicidal active ingredient, and more particularly, to a herbicide composition having improved safety as compared with conventional sodium chlorate-based herbicides.

Conventionally, herbicides containing sodium chlorate and sodium bicarbonate have been used as a herbicide for weeds growing in paddy fields and fields.
These herbicides may be in liquid or solid form, but solid herbicides are preferred in order to obtain longer-lasting properties.

  Herbicidal compositions containing sodium chlorate have high flammability, and are liable to cause risks such as explosion due to impact, and thus require handling with care. In addition, when it is determined that the substance is dangerous according to the Fire Service Law, installation and handling of special equipment are required in all processes such as transportation, storage, and manufacturing, and there is a problem that the production cost increases.

  Patent Literature 1 includes sodium chlorate, sodium bicarbonate, and a binder, and a shape of 80% by mass or more satisfies a longest diameter / shortest diameter = 1.0 to 1.5, and a particle size of A herbicidal composition having a is greater than or equal to 2 mm.

JP 2015-166337 A

Since the herbicide composition containing sodium chlorate may burn violently when a fire or the like occurs due to an accident during transportation or storage, sufficient care must be taken when handling the herbicide composition. . Accordingly, there is a need for a herbicide composition whose combustion is controlled so that the combustion time is prolonged.
In the firefighting method confirmation test of the herbicide composition in the conventional formulation containing sodium chlorate, sodium bicarbonate, and bentonite described in Patent Document 1, the burning time of the mass burning test is shorter than the standard substance, It was determined to be dangerous goods.
Accordingly, an object of the present invention is to provide a herbicide composition which can maintain herbicidal performance for a long period of time, and has a long burning time when burned in a large amount, and is excellent in safety and handleability. It is to be.

  The present inventors have conducted intensive studies, and as a result, a herbicide composition containing sodium chlorate and sodium hydrogen carbonate as herbicidally active components, a clay mineral as an inorganic compound, and aluminum hydroxide as a combustion control agent solves the above problems. They have found that they can do this and have completed the present invention.

  That is, the present invention is shown in the following (1) to (4).

  (1) A herbicide composition containing at least sodium chlorate, sodium hydrogen carbonate and a clay mineral, wherein the herbicide composition contains 5 to 20% by weight of aluminum hydroxide.

  (2) The herbicidal composition according to the above (1), wherein the composition contains 25 to 60% by weight of sodium chlorate, 10 to 40% by weight of sodium bicarbonate, and 5 to 40% by weight of a clay mineral. Stuff.

  (3) The herbicidal composition according to (1) or (2), wherein the average particle size of the aluminum hydroxide is 0.01 to 70 µm.

  (4) The herbicidal composition according to any one of (1) to (3), wherein the particle size is 2 mm or more.

  According to the herbicide composition of the present invention, it is possible to provide a herbicide composition having no problem with respect to its effectiveness as a herbicide, toxicity to humans and animals, and environmental effects on aquatic animals and plants. Since it is longer than the herbicide composition, it is possible to provide a highly safe herbicide composition that is easy to store and handle during distribution.

It is a flowchart of a dangerous goods type 1 confirmation test.

Hereinafter, the herbicidal composition of the present invention will be described in detail.
(About components)
The herbicidal composition of the present invention comprises sodium chlorate, sodium bicarbonate and clay mineral. Sodium chlorate is represented by the chemical formula NaClO ₃ . Sodium bicarbonate is represented by the chemical formula NaHCO ₃ .
Here, sodium chlorate and sodium hydrogen carbonate function as herbicidal active ingredients.

  The clay mineral plays a role in joining the herbicidal active ingredients and forming the same into a granular form. Specific examples of clay minerals include clays, talcs, silicas, barium sulfate, calcium carbonate, calcium sulfate, calcium phosphate, aluminum silicate, magnesium aluminum silicate, smectite, bentonite, heclite, synthetic hydrated silicic acid, and the like. Among these, it is preferable to use bentonite from the viewpoint of granular moldability and safety.

The herbicidal composition of the present invention is characterized by containing aluminum hydroxide in the above components. This aluminum hydroxide functions as a combustion control agent and a flame retardant in the herbicide composition.
Inorganic hydrous compounds other than aluminum hydroxide that function as flame retardants include hydrated gypsum, zinc borate, barium borate, borax, kaolin clay, calcium carbonate, alumite, basic magnesium carbonate, calcium hydroxide, etc. However, compared to these inorganic hydrated compounds, the aluminum hydroxide used in the present invention has a relatively low decomposition temperature and a large total heat absorption, so that a large-scale combustion test of the herbicidal composition is required. This has the effect of greatly extending the combustion time.

(Preferred composition of components)
Preferred compositions of the herbicidal composition of the present invention include:
It is preferable that 25-60% by weight of sodium chlorate, 10-40% by weight of sodium hydrogen carbonate, 5-20% by weight of aluminum hydroxide and 5-40% by weight of clay mineral are contained.

If the content of sodium chlorate is less than 25% by weight, the herbicidal effect may be impaired. If the content exceeds 60% by weight, safety may not be ensured.
If the content of sodium bicarbonate is less than 10% by weight, safety may not be ensured. If the content exceeds 40% by weight, the herbicidal effect may be impaired.
If the amount of aluminum hydroxide is less than 5% by weight, the effect of extending the burning time in the mass combustion test may not be exhibited, and if it exceeds 20% by weight, the herbicidal effect may be impaired.
If the amount of the clay mineral is less than 5% by weight, the granular formability of the herbicide may be impaired. If the amount exceeds 40% by weight, the herbicidal effect may be impaired.

(Aluminum hydroxide particle size)
The particle size of aluminum hydroxide to be added to the herbicidal composition of the present invention is not particularly limited, but the average particle size is 0.01 to 70 μm, more preferably 0.1 to 50 μm, and still more preferably 1 to 50 μm. It is preferable to use one having a size of 35 μm. When the average particle size is less than 0.01 μm, handling during production and moldability of the herbicidal composition may become difficult. There are cases.

(Average particle size of the herbicidal composition)
The particle size of the herbicidal composition of the present invention is preferably 2 mm or more. In addition, the particle size of the herbicidal composition of the present invention of 2 mm or more is defined as a mesh sieve having a mesh of 2 mm (mesh sieve specified in "Standard sieve" of Japanese Industrial Standard Z8801 and having a mesh of 2 mm). When a set of herbicidal compositions is put in and shaken by applying 160 beats per minute while rotating, it means that 10% by weight or less passes through the screen sieve in 30 minutes. This test method is based on the Fire Defense Law: Ministerial Ordinance on Testing and Properties of Dangerous Goods (Ordinance No. 1 of the Ministry of Home Affairs on February 17, 1989) Final: On October 11, 2001, This is a test method to determine whether it is applicable. That is, the herbicidal composition of the present invention having a particle size of 2 mm or more is other than the powdery and granular ones in the test for confirming the granularity of the test method.

(Method for producing herbicide composition)
In the method for producing a herbicide composition of the present invention, water is added to a mixture containing sodium chlorate, sodium bicarbonate, aluminum hydroxide, and a clay mineral and kneaded.
The kneaded mixture is extruded using a 2.2 mm screen by an extruder and then granulated by a granulator.
Thereafter, drying is performed at a temperature of room temperature to 70 ° C., preferably for 4 to 12 hours. Thereafter, the herbicidal composition of the present invention can be obtained by sieving with a 2 mm sieve.

(Evaluation method of herbicide composition: criteria for danger)
The herbicidal composition of the present invention is evaluated by the above-mentioned tests for dangerous substances and each test based on the description of the ministerial ordinance concerning the properties. FIG. 1 shows a flowchart for determining a dangerous substance.
Each test described in FIG. 1 is performed, and the risk is determined in consideration of the results.

  Hereinafter, the present invention will be described more specifically with reference to examples.

Hereinafter, all the compositions of Comparative Examples and Examples were uniformly mixed at the respective mixing ratios shown in the table below, kneaded by adding an appropriate amount of water, and 2.2 mm using an extrusion granulator. After granulating with a screen, the mixture was sized using a sizing machine (manufactured by Dalton Co., Malmerizer), dried at a temperature of 50 ° C. for 4 hours or more, and then sieved with a 2 mm sieve.

Table 1 shows the results of the firefighting method confirmation test in a conventional blend of 50 parts of sodium chlorate, 30 parts of sodium hydrogen carbonate and 20 parts of bentonite.
The iron tube test is a test in which a mixture of a test article and cellulose powder in a weight ratio of 3: 1 is packed in an iron tube, detonated in sand, and observed three times to observe the degree of rupture of the iron tube. If it does not burst completely, it is determined that there is no danger.
The mass burning test is a combustion test of 500 g of a mixture of test articles and wood flour in a volume ratio of 1: 1 and a combustion of 500 g of a mixture of potassium perchlorate as a standard substance and wood flour in a weight ratio of 2: 3. Each test was performed 5 times, and the average burning time was determined. If the average burning time of the test article was longer than the standard material, it was determined that there was no danger.
The hazards are comprehensively evaluated by these confirmation tests. If all of the tests show no danger, the products are judged as non-dangerous goods under the Fire Service Law.

  As shown in Comparative Example 1, in the iron tube test, the herbicide composition of the conventional composition gave no explosion. However, the average burning time in the mass burning test was shorter than that of the standard substance, and it was judged to be dangerous.

  Therefore, a large-scale combustion test was performed on the herbicide compositions having the respective compositions shown in Tables 2 to 6 below, and the danger was evaluated. In addition, "part" in a comparative example and an Example shows a weight part. In the mass burning test, the average burning time of the reference material is determined for each test as a criterion.

  The average amount of combustion time in the mass combustion test was determined by changing the blending amount of sodium bicarbonate and aluminum hydroxide. The composition and the test results are shown in Table 2 below.

  As shown in Table 2, the combustion time of sodium hydrogencarbonate was not significantly extended even when 30 parts or more were added, and the average combustion time was not longer than that of the standard substance. Even with 30 parts of aluminum hydroxide, the average burning time did not become longer than that of the standard substance. In addition, a problem in terms of cost arises when formulating a large amount of aluminum hydroxide.

  Inorganic compounds that are expected to have the effect of a flame retardant that is expected to have a combustion suppressing effect without impairing the efficacy as a herbicide were selected, and 10 parts of each compound was added to the conventional composition, and a mass combustion test was performed. Table 3 shows the results.

  As shown in Table 3, the average burning time of all inorganic compounds other than aluminum hydroxide was shorter than that of the standard substance, and it was determined that there was danger.

  A study on the effective blending amount of aluminum hydroxide with respect to the blending of 50 parts of sodium chlorate and 30 parts of sodium bicarbonate was conducted by a mass combustion test. Table 4 shows the results.

  As shown in Table 4, the average combustion time becomes longer than that of the standard substance by mixing 5 parts or more of aluminum hydroxide with respect to 50 parts of sodium chlorate and 30 parts of sodium hydrogen carbonate, and it is judged that there is no danger. It became. It was confirmed that the combined use of sodium bicarbonate and aluminum hydroxide exhibited a synergistic combustion suppression effect.

  In order to investigate the effect of the particle size of aluminum hydroxide, a study was conducted by a mass combustion test. Table 5 shows the results.

  As shown in Table 5, when 10 parts of aluminum hydroxide was added to 50 parts of sodium chlorate and 30 parts of sodium hydrogencarbonate, the average burning time was 10 hours when aluminum hydroxide having a particle size of 35 μm or less was added. In particular, there was a tendency to be longer.

  Each herbicidal composition as shown in Table 6 was prepared, and the dangerous substances were comprehensively evaluated based on a dangerous substance class 1 confirmation test prescribed by a Cabinet Order on Dangerous Goods Regulations.

  As shown in Table 6, all of the examples were results that were comprehensively determined to be non-relevant to Dangerous Goods Class 1.

  Since the herbicidal composition of the present invention is not classified as the first category of dangerous substances under the Fire Services Act, its safety is improved, and the herbicidal composition is very advantageous in terms of distribution costs and safety.

Claims (4)

In a herbicide composition containing at least sodium chlorate, sodium bicarbonate and a clay mineral,
A herbicidal composition comprising 5 to 20% by weight of aluminum hydroxide.   The herbicidal composition according to claim 1, wherein the composition contains 25 to 60% by weight of sodium chlorate, 10 to 40% by weight of sodium bicarbonate, and 5 to 40% by weight of a clay mineral.   3. The herbicidal composition according to claim 1, wherein the average particle size of the aluminum hydroxide is 0.01 to 70 [mu] m.   The herbicidal composition according to any one of claims 1 to 3, wherein the particle size is 2 mm or more.

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