Defoamer for pesticide
With the development of modern science and technology, high quality and high benefit are required for pesticide industry. In other words, the formulation of pesticides should use various additives, including those to help the original drug wetting and dispersing, to improve the storage stability of pesticide products, and to achieve some special functions of additives. Most of these additives are Surfactant and can change the surface tension of pesticides, resulting in internal factors that make them prone to foaming or stable. Various high-speed mixers, such as sanding machines and ball mills, are used in the manufacture of pesticides. A variety of methods used in the final use of pesticides, such as mixed spraying. In these processes, the free energy of the pesticide system will be increased to varying degrees, helping to create a bubble, which is an external factor in the formation of a bubble. The foam problem of water-based pesticide is the most serious in pesticide industry, which is caused by its special formula and special production process.
(1) water emulsion, water suspension is a continuous phase with water in the preparation of emulsion must use a certain amount of emulsifier, in order to make a stable water dispersion. The use of emulsifier, resulting in the emulsion system surface tension greatly decreased, which is the main reason for the formation of foam.
(2) the wetting agent and dispersing agent which disperse the original drug particles in the water suspension are also the substances which reduce the surface tension of the system and contribute to the formation and stability of the foam.
(3) the low viscosity of water-based agent makes it difficult to preserve, and its physical stability is poor.
(4) agitating, dispersing and spraying in the water when the pesticide is used by the end user. All of these can alter the free energy of the system to varying degrees, causing bubbles to occur. The problem of foam in water-based dosage forms makes the operation difficult. The air in the foam not only hinders the dispersion of the original drug or filler, but also affects the output due to the underutilization of the equipment, need to stand many times filling. The general market to three, four more common, do a good job with the work to ensure the integration of defoamer and the whole system, play defoamer foam inhibition and long-term effect can be.
