A dispersant composition for pesticide granules and its preparation method

Abstract

This invention discloses a dispersant composition for pesticide granules, which is made from the following components in parts by weight: 30-85 parts sodium naphthalenesulfonate formaldehyde condensate, 10-30 parts silica, 5-30 parts sodium dioctyl sulfosuccinate, 1-10 parts isomeric alcohol polyoxyethylene ether, and 5-15 parts wetting agent. The preparation method of this dispersant composition is as follows: first, add isomeric alcohol polyoxyethylene ether and sodium dioctyl sulfosuccinate to silica and mix evenly; then add sodium naphthalenesulfonate formaldehyde condensate and wetting agent and mix evenly; finally, pulverize to 50-100 mesh using a pulverizer to obtain the final product. Compared with existing dispersants for pesticide granules, the dispersant composition of this invention can accelerate the disintegration of pesticide granules, improve suspension performance, and has good stability, making it suitable for most pesticide granule products.

Description

Technical Field

[0001] This invention relates to a dispersant composition for pesticide granules and its preparation method, belonging to the field of pesticide formulation technology. Background Technology

[0002] Pesticide granules are granular formulations made from pesticide active ingredients, carriers, surfactants, etc. As a conventional pesticide formulation, they are convenient to use and highly effective, and are widely used in my country's agricultural production for the control of underground pests, weeding in paddy fields, and soil disinfection.

[0003] A high-performance pesticide granule formulation needs to possess good disintegration properties, wetting and dispersibility, and a high suspension rate. Therefore, surfactants are typically added to pesticide granule formulations to wet, disperse, and promote disintegration. Commonly used surfactants include sodium alkylbenzene sulfonate and sodium lignin sulfonate. While these dispersants have some disintegration-promoting and dispersing effects, they often present difficulties in disintegrating low-melting-point active ingredients or high-content formulations, or result in low suspension rates after disintegration, thus affecting the dispersion of the active ingredient.

[0004] Therefore, there is an urgent need to develop a dispersant for pesticide granules that can accelerate the disintegration of pesticide granules, improve the suspension rate, and improve the quality of pesticide granules. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide a dispersant composition for pesticide granules, which can accelerate the disintegration of pesticide granules and improve the suspension performance of pesticide granules.

[0006] Technical solution

[0007] A dispersant composition for pesticide granules is made from the following components in parts by weight: 30-85 parts sodium naphthalene sulfonate formaldehyde condensate, 10-30 parts silica, 5-30 parts sodium dioctyl sulfosuccinate, 1-10 parts isomeric alcohol polyoxyethylene ether, and 5-15 parts wetting agent.

[0008] Furthermore, the isomeric alcohol polyoxyethylene ether is isomeric tridecyl alcohol polyoxyethylene ether.

[0009] Furthermore, the wetting agent is selected from one or more of sodium dodecyl sulfate, sodium dodecylbenzene sulfonate, or sodium α-alkenyl sulfonate in any proportion.

[0010] The preparation method of the above-mentioned dispersant composition for pesticide granules is as follows: First, add isomeric alcohol polyoxyethylene ether and sodium dioctyl sulfosuccinate to silica, mix evenly, then add sodium naphthalene sulfonate formaldehyde condensate and wetting agent and mix evenly. Then, pulverize to 50-100 mesh using a pulverizer to obtain the final product.

[0011] The above-mentioned dispersant composition is used in the preparation of pesticide granules by mixing the dispersant composition with the pesticide technical, disintegrant, and filler evenly, then extruding and granulating, and drying to obtain pesticide granules; based on the total mass of the pesticide granules as 100%, the amount of the dispersant composition is 5-16%, the amount of the pesticide technical is 35-85%, the amount of the disintegrant is 5-25%, and the amount of the filler is 0-25%.

[0012] The pesticide technical material is selected from one or more of tricyclazole, difenoconazole, acetamiprid or pymetrozine;

[0013] The disintegrant is sodium sulfate, ammonium sulfate, or a combination of the two in any proportion.

[0014] The filler is one or a combination of two of the following in any proportion: silica or corn starch.

[0015] The beneficial effects of this invention are:

[0016] This invention provides a dispersant composition for pesticide granules, which can be added as a dispersant to most pesticide granule products. After use, it can accelerate the disintegration of pesticide granules, improve suspension performance, and has good stability. Detailed Implementation

[0017] The technical solution of the present invention will be clearly and completely described below with reference to specific embodiments.

[0018] It is worth noting that in the following examples, the sodium naphthalene sulfonate formaldehyde condensate was purchased from Dow Chemical Company, USA, and the isomeric tridecyl alcohol polyoxyethylene ether was purchased from Solvay (China) Co., Ltd., but is not limited thereto.

[0019] Example 1

[0020] A dispersant composition for pesticide granules is made from the following components in parts by weight: 50 parts sodium naphthalene sulfonate formaldehyde condensate, 20 parts silica, 15 parts sodium dioctyl sulfosuccinate, 5 parts isotridecyl alcohol polyoxyethylene ether, and 10 parts sodium dodecyl sulfate.

[0021] Preparation method of dispersant composition for pesticide granules: According to the above-mentioned mass parts, first add isomeric alcohol polyoxyethylene ether and sodium dioctyl sulfosuccinate to silica, mix evenly, then add sodium naphthalene sulfonate formaldehyde condensate and wetting agent and mix evenly. Use a stainless steel blade pulverizer (rated power 500W, load power 4500W, motor speed 28000r / min) to pulverize to 50-100 mesh to obtain the dispersant composition for pesticide granules.

[0022] Example 2

[0023] A dispersant composition for pesticide granules is made from the following components in parts by weight: 52 parts sodium naphthalene sulfonate formaldehyde condensate, 20 parts silica, 16 parts sodium dioctyl sulfosuccinate, 4 parts isomeric tridecyl alcohol polyoxyethylene ether, and 8 parts sodium dodecylbenzene sulfonate.

[0024] Preparation method of dispersant composition for pesticide granules: According to the above-mentioned mass parts, first add sodium dioctyl sulfosuccinate and isomeric tridecyl alcohol polyoxyethylene ether to silica, stir evenly, then add sodium naphthalene sulfonate formaldehyde condensate and sodium dodecylbenzene sulfonate, mix evenly, and then use a blade grinder (rated power 500W, load power 4500W, motor speed 28000r / min) to grind to 50-100 mesh to obtain the dispersant composition.

[0025] Comparative Example 1

[0026] A dispersant composition: Sodium naphthalenesulfonate formaldehyde condensate and sodium dodecyl sulfate are mixed evenly in a mass ratio of 2:1, and then pulverized to 50-100 mesh using a blade grinder (rated power 500W, load power 4500W, motor speed 28000r / min) to obtain the dispersant composition.

[0027] Comparative Example 2

[0028] A dispersant composition: Sodium lignosulfonate and sodium dodecylbenzenesulfonate in a mass ratio of 2:1 are mixed evenly and pulverized to 50-100 mesh using a blade pulverizer (rated power 500W, load power 4500W, motor speed 28000r / min) to obtain the dispersant composition.

[0029] Application testing:

[0030] 1. The dispersant compositions of Examples 1-2 and Comparative Examples 1-2 were used to prepare pesticide granules (20% acetamiprid + 60% pymetrozine), and the formulations are shown in Table 1:

[0031] Table 1. Pesticide granule formulation (20% acetamiprid + 60% pymetrozine)

[0032] Component Name Formula proportions (by weight) Acetaminophen 96.3% 20.8％ Pymetrozine 98% 61.3％ Dispersant Composition 9％ Filler (silica) 3％ Disintegrant (ammonium sulfate) 5.9％ 100％

[0033] Preparation method of pesticide granules: Mix the dispersant composition with the pesticide technical, disintegrant and filler evenly, then extrude and granulate, and dry to obtain pesticide granules.

[0034] The disintegration and suspension rate of pesticide granules were tested. The suspension rate was tested according to the method in GB / T14825-2006. The disintegration test method was as follows: 0.50 g of pesticide granules were added to a 100 mL stoppered graduated cylinder containing 90 mL of standard hard water at 25 °C. The middle of the graduated cylinder was clamped and the mouth of the bottle was stopped. The graduated cylinder was rotated up and down with the middle of the graduated cylinder as the center. Each rotation lasted 2 seconds. One up and down rotation was counted as one cycle. The number of times the graduated cylinder was rotated when the granules were completely disintegrated was recorded.

[0035] The disintegration and suspension rates of pesticide granules prepared using the dispersant compositions of Examples 1-2 and Comparative Examples 1-2 are shown in Table 2:

[0036] Table 2 Results of Disintegration and Suspension Rate Tests for Pesticide Granules

[0037] Disintegration (number of times the graduated cylinder is inverted) suspension rate Example 1 160 92.7％ Example 2 188 91.2％ Comparative Example 1 Cannot disintegrate Because it cannot disintegrate, it cannot be measured. Comparative Example 2 Cannot disintegrate Because it cannot disintegrate, it cannot be measured.

[0038] 2. The dispersant compositions of Examples 1-2 and Comparative Examples 1-2 were used to prepare pesticide granules (difenoconazole), and the formulations are shown in Table 3:

[0039] Table 3 Formulation of Difenoconazole Pesticide Granules

[0040]

[0041] The disintegration and suspension rates of pesticide granules prepared using the dispersant compositions of Examples 1-2 and Comparative Examples 1-2 are shown in Table 4:

[0042] Table 4. Results of Disintegration and Suspension Rate Tests for Pesticide Granules

[0043] Disintegration (number of times the graduated cylinder is inverted) suspension rate Example 1 16 93.3％ Example 2 19 92.1％ Comparative Example 1 Cannot disintegrate Because it cannot disintegrate, it cannot be measured. Comparative Example 2 Cannot disintegrate Because it cannot disintegrate, it cannot be measured.

[0044] As can be seen from the test results in Table 2, the pesticide granules prepared using the dispersant compositions of Examples 1-2 of the present invention have better disintegration and suspension properties.

[0045] 3. The dispersant compositions of Examples 1-2 and Comparative Examples 1-2 were used to prepare pesticide granules (tricyclazole), and the formulations are shown in Table 5:

[0046] Table 5. Formulation of Tricyclazole Pesticide Granules

[0047]

[0048] The disintegration and suspension rates of pesticide granules prepared using the dispersant compositions of Examples 1-2 and Comparative Examples 1-2 are shown in Table 6:

[0049] Table 6 Results of Disintegration and Suspension Rate Tests for Pesticide Granules

[0050] Disintegration (number of times the graduated cylinder is inverted) suspension rate Example 1 20 90.3％ Example 2 22 88.5％ Comparative Example 1 Cannot disintegrate Because it cannot disintegrate, it cannot be measured. Comparative Example 2 Cannot disintegrate Because it cannot disintegrate, it cannot be measured.

[0051] As can be seen from the test results in Table 3, the pesticide granules prepared using the dispersant compositions of Examples 1-2 of the present invention have better disintegration and suspension properties.

Claims

1. A dispersant composition for pesticide granules, characterized in that, It is made from the following components in parts by weight: 30-85 parts sodium naphthalene sulfonate formaldehyde condensate, 10-30 parts silica, 5-30 parts sodium dioctyl sulfosuccinate, 1-10 parts isomeric alcohol polyoxyethylene ether, and 5-15 parts wetting agent. The wetting agent is selected from one or more of sodium dodecyl sulfate, sodium dodecylbenzene sulfonate, or sodium α-alkenyl sulfonate in any proportion.

2. The dispersant composition for pesticide granules as described in claim 1, characterized in that, The isomeric alcohol polyoxyethylene ether is isomeric tridecyl alcohol polyoxyethylene ether.

3. The method for preparing the dispersant composition for pesticide granules according to claim 1 or 2, characterized in that, First, add isomeric alcohol polyoxyethylene ether and sodium dioctyl sulfosuccinate to silica and mix well. Then, add sodium naphthalene sulfonate formaldehyde condensate and wetting agent and mix well. Finally, pulverize the mixture to 50-100 mesh using a pulverizer to obtain the final product.

4. The use of the dispersant composition according to claim 1 or 2 in the preparation of pesticide granules, characterized in that, The application method is as follows: the dispersant composition is mixed evenly with the pesticide technical, disintegrant, and filler, then extruded and granulated, and dried to obtain pesticide granules; based on the total mass of the pesticide granules as 100%, the amount of the dispersant composition is 5-16%, the amount of the pesticide technical is 35-85%, the amount of the disintegrant is 5-25%, and the amount of the filler is 0-25%. The pesticide technical material is selected from one or a combination of two or more of tricyclazole, difenoconazole, acetamiprid, or pymetrozine.

5. The application as described in claim 4, characterized in that, The disintegrant is sodium sulfate, ammonium sulfate, or a combination of the two in any proportion.

6. The application as described in claim 4, characterized in that, The filler is one or a combination of two of the following in any proportion: silica or corn starch.

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