CN1695455A - Phoxim, acephate compound insecticidal wettable powder - Google Patents

Abstract

A composite insecticide in the form of wettable powder for preventing and eliminating the pests of rice, fruit tree, vegetables, etc is prepared phoxim, acephate, assistant and filler through adsorptive mixing, and pulverizing.

Description

Phoxim, acephate compound insecticidal wettable powder

Technical field:

The invention belongs to pesticide compounding and a preparation method thereof, in particular to a compound insecticidal wettable powder prepared from phoxim, acephate, auxiliary agents and fillers through adsorption, mixing and crushing.

Background technique

Methamidophos is a conventional pesticide for controlling rice borers, especially rice leaf rollers. Due to its high toxicity, it has been included in the list of banned pesticides, and its use has been banned in many rice producing areas. As a low-toxic substitute product of methamidophos, acephate has increasingly become a routine pesticide for the control of rice leaf roller. The currently commercialized acephate preparation is mainly 30% acephate emulsifiable concentrate. The main disadvantages of this preparation are:

1. The solvent in the preparation is methanol, and the storage stability is very poor, and the decomposition rate after thermal storage usually reaches more than 20%.

2. Acephate is a slow-acting insecticide with a slow killing speed.

3. The production cost of the original drug of acephate is high, the effective dosage per mu is large, and the production and use costs are relatively high.

4. Acephate is a systemic insecticide, and frequent use of a single dose can easily lead to drug resistance and affect its service life. In addition, the insecticide is not effective in killing older larvae.

5. The emulsifiable concentrate preparation wastes solvents, pollutes the environment, and does not meet the requirements of the development trend of pesticides.

Based on the above-mentioned many problems, mixing with other medicaments and reforming dosage forms are the only way for the future development of acephate.

Phoxim is the most contact-killing organophosphorus insecticide. It is characterized by high efficiency, low toxicity, slow development of resistance, low cost of use, rapid killing effect on older larvae, and usually has a strong synergistic effect when mixed with other agents. Its disadvantage is that the conventional preparation is emulsifiable concentrate, the active ingredients are easy to decompose when exposed to light, and the effective period is short. No systemic activity, easy to cause phytotoxicity when the concentration is high. Therefore, although phoxim has a good control effect on rice borer, it has not become a conventional agent for controlling rice borer.

Purpose of the invention:

The purpose of the present invention is to provide a kind of compound processing of phoxim, acephate, additives and fillers with high efficiency, broad spectrum, low toxicity, low use cost, long duration of effect, and not easy to produce drug resistance. insecticidal wettable powder.

Contents of the invention

The active ingredients in the phoxim-acephate composite insecticidal wettable powder of the present invention are phoxim and acephate, both of which are broad-spectrum, low-toxic organophosphorus insecticides. The insecticidal mechanisms of the two active ingredients are the same, and the insecticidal properties are complementary. After compounding them, they make up for their respective shortcomings and inherit their respective advantages. The composite insecticide of the invention has high efficiency, low toxicity and broad spectrum, quick and long-lasting effect, and at the same time reduces the control cost and delays the generation of resistance. Adding synergistic adjuvants can greatly improve the spreading, wetting and penetrating properties of the liquid medicine, improve the utilization rate of active ingredients and reduce the body surface resistance of pests, and have an excellent synergistic effect on the medicine. After phoxim is adsorbed by self-carbon black, it can effectively reduce the photolysis of light, which is beneficial to prolong the drug effect period of phoxim. Therefore, the composite preparation has a significant comprehensive control performance compared with a single agent. The results of drug efficacy test showed that the control effect of the compound preparation on rice leaf roller was significantly better than that of phoxim and acephate at the same dose.

The weight percentage of each component in the compound insecticidal wettable powder of the present invention is as follows:

phoxim 10～40%

Acephate 10～40%

Wetting and dispersing agent 2～10%

  Synergist               0～15%

  Filling                

The wetting and dispersing agent and the synergist of the present invention respectively comprise known wetting agents and dispersants such as K ₁₂ , dodecylbenzenesulfonate, NNO, MF, LS, One or more mixtures of lignosulfonate, nonionic surfactant, or emulsifier composed of nonionic and anionic surfactants. The synergist is one or more of alkylphenol polyoxyethylene ether, fatty alcohol polyoxyethylene ether, rapid penetration agent T, azone, butylzone, N-alkylpyrrolidone, tea saponin, etc. mixture. The filler described in the present invention is a filler well known to those skilled in the art, white carbon black or a mixture of white carbon black and known fillers such as bentonite, pottery clay, light calcium, diatomaceous earth and the like.

Provide the specific embodiment of the present invention below:

Example 1.

Phoxim 15%

Acephate 15%

_K12 1.5%

NNO 3.5%

White Carbon Black 15%

Azone 1%

                           

Example 2.

Phoxim 10%

Acephate 40%

Sodium dodecylbenzenesulfonate 2%

LS 2%

Thiolone 1%

White Carbon Black 8%

                         

Example 3.

Phoxim 40%

Acephate 10%

MF 4%

JFC Penetrant 2%

2201 emulsifier 2%

White Carbon Black 30%

                                     

Processing technology:

Claims (4)

1. A group of compound insecticidal wettable powders, characterized in that it is made of phoxim and acephate as active ingredients, and additives and fillers are added through adsorption, mixing and crushing. The weight percentage of each component is The content is: Phoxim 10～40% Acephate 10～40% Wetting and dispersing agent 2～10% Synergist 0～15% Filling balance 2. composite insecticidal wettable powder as claimed in claim 1, is characterized in that described wetting and dispersing agent, comprises the known wetting agent of producing pesticide wettable powder, dispersant such as K ₁₂ , lauryl One or more mixtures of benzenesulfonate, NNO, MF, LS, lignosulfonate, nonionic surfactants or emulsifiers composed of nonionic and anionic surfactants. 3. composite insecticidal wettable powder as claimed in claim 1, is characterized in that described synergist comprises the tensio-active agent with penetration such as alkylphenol polyoxyethylene ether, fatty alcohol polyoxyethylene ether, One or a mixture of fast penetrating agent T, azone, butylzone, N-alkylpyrrolidone, tea saponin, etc. 4. composite insecticidal wettable powder as claimed in claim 1, is characterized in that described filler can be white carbon black also can be by white carbon black and known filler such as bentonite, clay, light calcium, diatomaceous earth any mixture.