Preparation method of surfactant for clethodim

Abstract

The invention provides a preparation method of a surfactant for clethodim, which comprises the following steps: heating raw materials, preserving heat to 50 DEG C, adding the materials one by one, and stirring until the materials are completely uniform, light yellow and transparent. The raw materials comprise calcium dodecyl benzene sulfonate, dodecanol polyoxyethylene ether, polystyrylphenol polyoxyethylene ether and an ethylene oxide-propylene oxide high-molecular block polymer. The surfactant is matched with other surfactants, the problem is solved by utilizing a synergistic effect, the preparation operation is simple, and the working efficiency is improved.

Description

Technical Field

[0001] The present invention relates to a preparation method of an active agent, and particularly to a preparation method of a surfactant for clethodim. Background Art

[0002] Clethodim is a cyclohexenone (CHD) herbicide. It is a new post-emergence herbicide for dry fields and has excellent selectivity. It is suitable for controlling grass weeds such as barnyard grass, wild oats, crabgrass, green foxtail, goosegrass, Alopecurus aequalis, Poa annua, and rigid ryegrass in broad-leaved fields such as soybean, rapeseed, cotton, and peanut. After application, it can be quickly absorbed by the stems and leaves of grass weeds and conducted to the shoot tips and meristems, inhibiting the activity of the meristems, destroying cell division, and ultimately causing the weeds to die.

[0003] Currently, the domestic registrations are mainly 240 g / L clethodim EC and the technical material. As of January 2022, there are about 170 domestic manufacturers of registered formulations and technical materials. The formulated products and technical materials produced are mainly for export to foreign markets. In 2019, the export of technical material abroad was 6,080 tons (in terms of 100% active ingredient), with a total amount of 254 million US dollars. The export volume of 240 g / L clethodim EC was as high as 19,000 tons (export value of about 150 million US dollars). It is one of the most important varieties of Chinese pesticides exported globally.

[0004] For the development of 240 g / L clethodim EC, the current domestic surfactant products are mainly provided by some domestic surfactant manufacturers. Although the price is not high, problems such as decomposition of the active ingredient, unqualified emulsion stability, poor drug efficacy, and non-environmental friendliness are likely to occur. Some foreign surfactant manufacturers have not perfectly solved problems such as easy decomposition and poor drug efficacy either. To meet the needs of agrochemical formulation enterprises, it is very necessary to develop a surfactant for 240 g / L clethodim EC that is easy to produce, more environmentally friendly, and more effective.

[0005] Currently, the raw materials for preparing the surfactant of 240 g / L clethodim EC are not environmentally friendly and the preparation is cumbersome. There is an urgent need for an environmentally friendly and highly efficient preparation method. Summary of the Invention

[0006] To solve the above problems, the present invention discloses a preparation method of a surfactant for clethodim, which uses a surfactant with a special structure and is combined with other surfactants.

[0007] The problem is solved by using the synergistic effect. The preparation operation is simple and the work efficiency is improved.

[0008] A preparation method of a surfactant for clethodim, heating the raw materials to keep the materials warm at 50 °C, adding them one by one and stirring until it becomes completely homogeneous, light yellow and transparent.

[0009] Furthermore, the raw materials include calcium dodecylbenzenesulfonate, dodecylphenol polyoxyethylene ether, polyphenylstyryl phenol polyoxyethylene ether, and ethylene oxide-propylene oxide high molecular block polymer.

[0010] Furthermore, the calcium dodecylbenzenesulfonate is heated to 50 °C before production and kept at a constant temperature for 30 min - 1 h.

[0011] Furthermore, the dodecylphenol polyoxyethylene ether is heated to 50 °C before production and kept at a constant temperature for 30 min - 1 h.

[0012] Furthermore, the polyphenylstyryl phenol polyoxyethylene ether is heated to 50 °C before production and kept at a constant temperature for 30 min - 1 h.

[0013] Furthermore, the ethylene oxide-propylene oxide high molecular block polymer is heated to 50 °C before production and kept at a constant temperature for 30 min - 1 h.

[0014] Furthermore, the stirring time is 1 hour.

[0015] The beneficial effects of the present invention: By introducing surfactants with special structures and combining them with other surfactants, the problem is solved by using the synergistic effect. The preparation operation is simple and the work efficiency is improved. Specific Embodiments

[0016] The following further clarifies the present invention in combination with specific embodiments. It should be understood that the following specific embodiments are only used to illustrate the present invention and not to limit the scope of the present invention.

[0017] This embodiment provides a preparation method for a surfactant for clethodim. The raw materials, namely calcium dodecylbenzenesulfonate, dodecylphenol polyoxyethylene ether, polyphenylstyryl phenol polyoxyethylene ether, and ethylene oxide-propylene oxide high molecular block polymer, are respectively heated to keep the materials at 50 °C and kept at a constant temperature for 40 min, and then added one by one and stirred until completely homogeneous and light yellow transparent; the stirring time is 1 hour.

[0018] List of Main Detection Methods and (Large and Medium-sized) Instrument and Equipment

[0019]

[0020] It includes technical solutions composed of any combination of the above technical features.

Claims

1. A preparation method of a surfactant for clethodim, characterized in that; Heat the raw materials and keep the materials heated and insulated at 50°C. Add them one by one and stir until it becomes completely homogeneous, light yellow and transparent.

2. The preparation method of a surfactant for clethodim according to claim 1, characterized in that: The raw materials include calcium dodecylbenzenesulfonate, dodecylphenol polyoxyethylene ether, polyphenylstyrylphenol polyoxyethylene ether, and ethylene oxide-propylene oxide high molecular block polymer.

3. The preparation method of a surfactant for clethodim according to claim 1, wherein: Among them, the calcium dodecylbenzenesulfonate is heated to 50°C before production and kept at a constant temperature for 30 min - 1 h.

4. The preparation method of a surfactant for clethodim according to claim 1, wherein: The dodecylphenol polyoxyethylene ether is heated to 50°C before production and kept at a constant temperature for 30 min - 1 h.

5. The preparation method of a surfactant for clethodim according to claim 1, wherein: The polyphenylstyrylphenol polyoxyethylene ether is heated to 50°C before production and kept at a constant temperature for 30 min - 1 h.

6. The preparation method of a surfactant for clethodim according to claim 1, wherein: The ethylene oxide-propylene oxide high molecular block polymer is heated to 50°C before production and kept at a constant temperature for 30 min - 1 h.

7. The preparation method of a surfactant for clethodim according to claim 1, characterized in that: The stirring time is 1 hour.

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