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1. Introduction to the basic situation of surfactants:
1.1. Pesticides and Surfactants: The processing of pesticide preparations is inseparable from surfactants, pesticides (including: emulsifiable concentrates, water emulsions, microemulsions, wettable powders, soluble powders, dispersible granules, granules, etc.). The processing is to add different types of surfactants. The addition of surfactant greatly reduces the surface tension of the solution, enhances the wetting, spreading and adhesion of the agent on the surface of the plant or pest, thereby improving the efficacy. At present, the main pesticide surfactants used are: fatty alcohol polyoxyethylenes, alkylphenol polyoxyethylene ethers, sulfonates, sulfonates, amides, silicones, and the like. The pesticide surfactant itself has no insecticidal and bactericidal effects, but its emulsifying properties and exhibitability will affect the efficacy of the pesticide. At present, the main difference between the domestically produced agent with the same active ingredient and content and the agent of the multinational company lies in the application of the surfactant in the agent, such as: the difference between the domestically produced 41% water agent and the herbicide weeding effect, 40% domestically. The difference between the chlorpyrifos and the Doxor's insecticidal effect is due to the difference in surfactants added.
1.2. Application of Pesticide Surfactants: Pesticide surfactants can usually be added to pesticide formulations in two ways. One is to directly mix with the original pesticide to form a dosage form product. The other is that it is used as a tank mixing aid in the field. At present, the first type of additives directly mixed with pesticides is used, and the application is not described here. Second, there are two types of agricultural surfactants that are currently used in the market: the first category: agricultural additives with high permeability, such as high ketone, azone and the like. The representative company is several products of Henan Xinxiang Gaojin Pharmaceutical: diamond, gold powder, silver powder, and fungus killing. The second category: a silicone agricultural surfactant compounded with a modified polytrisiloxane (e.g., Fairland 2408, Silwet 408, B-204, S-309) as a main component. Compared with high-grade thiophenones and other mixed additives, not only have good permeability, but also good exhibitability.
Second, the application and marketing of silicone surfactants in agriculture
2.1. Characteristics of agricultural silicone surfactants:
Silicone additives have good spreadability and permeability due to their good agricultural silicone additives. In the spraying process of pesticides, it has the characteristics of synergy, labor saving, water saving and medicine saving. Silicone agricultural spray additives can help increase yields while reducing the environmental impact of pesticides. It enables sprayed agrochemicals to perform better, spread more easily, absorb faster and is less likely to be washed away, and has a "rain-resistant". In particular, these auxiliaries can make solutions containing pesticides, growth regulators, and other chemicals more readily penetrate the plant surface. This spreading capability means that the ideal spray effect can be achieved with a small amount of spray. When spraying pesticides, you can save up to 50% of water. This will reduce waste and reduce the amount of pesticides lost to the soil and groundwater, thereby reducing pesticide residues in the environment. It has the following characteristics in prevention and control:
1. Through effective compounding, the effect of various pesticides on the young larvae can be improved.
2. Through the stomata of the pest, it can directly reach the body of the pest. Under low tension, the stomata of the surface of the pest can reach the body of the pest, and the efficacy of some contact agents can be improved accordingly.
3. Good spreadability, which can improve the utilization rate of pesticides and effectively reduce the number of labors.
4. In the prevention and control of rice planthoppers and orchard pests, it is possible to effectively spread the agent to the base of the rice grove and the back surface of the leaf surface which is not sprayed with the pesticide, etc., which is difficult to spray by tension.
5. The lower expansion property can promote the direct diffusion of the systemic fungicide and herbicide into the leaf tissue of the plant leaf through the pores of the plant leaf surface, and play a good auxiliary absorption effect.
6. Good compounding, can be mixed with a variety of pesticides (insecticides, fungicides, herbicides, foliar fertilizers, biological fertilizers).
7. It is very easy to hydrolyze and must be sprayed within 4 hours after being formulated into a liquid.
2.2. Application of agricultural silicone surfactants:
It is reasonable to note that the surfactant is directly processed into a preparation with the original pesticide, which can save packaging materials and save time and effort. Why not directly formulate silicone auxiliaries and pesticides into pesticide preparations? As far as the current technical situation is concerned, since the silicone surfactant is easily decomposed under both acidic and alkaline conditions, the surface activity of the silicone can be ensured only when the pH of the pesticide preparation is 6.0-8. The agent will not decompose. (For example, the pH index of 41% glyphosate water is between 4.0 and 8.0)
Therefore, we have heard more information about the use of agricultural silicone surfactants. However, it is not excluded that the agricultural silicone surfactant can be processed into a pesticide with the original drug. The application of agricultural silicone surfactants is now as follows:
1. Directly processed into a preparation with the original pesticide.
As mentioned above, when the pH is in the range of 6.0-8. 0, the silicone builder can be processed into a formulation with the pesticide. Some formulation manufacturers have tried to add silicone additives to the emulsion formulation and achieved initial success.
2. Mix and spray with the pesticide dosage form on the ground (mixed now).
Due to the characteristics of agricultural silicone additives, the use of agricultural silicone surfactants in the field is becoming more and more hot in the country. According to the sample survey of the Zhejiang market, according to the owner of a retail store in Hezhou, Cangzhou, when the rice planthoppers broke out this year, when the farmers reported that the effects of agricultural chemicals alone were not good, the use of agricultural silicone additives was recommended. . Similar voices have received feedback from Lily farmers in Lishui Longquan. It can be seen that silicone agricultural surfactants have been recognized in terminal farmers and distributors.
Third, the analysis of agricultural silicone market
The corresponding advantages of silicone auxiliaries determine its great development prospects in China, especially in large crops such as fruit areas, rice areas, vegetable areas, etc., which have great development prospects for disease, insect and grass damage. .
1. Agricultural silicone can effectively solve the problem of pesticide residues in fruits and vegetables:
At present, a major obstacle facing the export of fruits and vegetables in China is the problem of pesticide residues. In China, due to factors such as education level and traditional use habits, farmers tend to have high concentration and high spray volume when spraying pesticides, and the residual problem is more prominent. Lost pesticides can also damage the surrounding soil environment and groundwater environment, forming a vicious circle. The international inspection standards for pesticide residues are constantly improving, especially in some developed countries such as the United States and Japan, which pay great attention to food safety issues. Therefore, reducing pesticide residues has become an urgent problem to be solved. The demand for such products in China's southeastern coastal areas, Jiaozhou Peninsula and other important fruit and vegetable producing areas is very large. The application of silicone additives can promote the rational use of pesticides, reduce pesticide residues, and improve the quality of fruits and vegetables.
2. Save water and reduce labor intensity:
Tests have shown that silicone agricultural spray additives can help 70% of water to be effectively promoted, which will undoubtedly ease the increasingly tight water resources in China. Compared with traditional auxiliaries, silicone agricultural spray auxiliaries have good penetrating effect, and a small amount of spray can achieve the desired effect, thus saving costs and reducing the labor of farmers, especially in the vast arid regions of northern China. The application prospect is broad. `
3, has a certain synergistic effect, can effectively reduce the amount of pesticides:
FAIRLAND Agricultural Silicone Spray Aid is a silicone auxiliaries widely used in insecticides. It does not decompose the original drug and has ultra-low surface tension and super-expansion ability (expansion capacity is more than 9 times that of pure water). ), can enhance the penetration and coverage of the liquid on the surface of the plant and the surface of the insect, thereby improving the efficacy; in addition, it can also enhance the ability of the agent to resist the rain wash. This has correspondingly reduced the amount of pesticide. In the case of some major pest outbreaks, it has a better effect.
1. Overview of agricultural silicone surfactants:
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