一, the characteristics of dry suspension
Dry suspending agent is a kind of particulate pesticide formulation product. It is a new generation product that is significantly better than other formulations in terms of content, packaging, technology, cost, quality stability, and application technology after suspending agent. Its performance makes it the top product in water dispersible granules. Because the dry suspending agent is in the state of suspension before drying and granulation, it becomes the state of solid particles after spray drying and granulation; when used, it is diluted with water and returned to the state of suspension, and the solid pesticide particles with a particle size of 1-10 μm are used as Disperse phase, a dispersion system with water as the continuous phase. After drying, it becomes a solid particle state, and when it is used with water, it returns to a suspension state. Its internal quality has all the advantages of a suspension agent, and its physical properties are excellent. The specific performance is as follows:
1. It disintegrates quickly in water, has good dispersibility and suspension. It disintegrates immediately in water, disperses in 6 s to 10 s, and quickly forms a stable suspension, without precipitation, no agglomeration, and no need to Block the nozzle.
2. Add a small amount of water to dilute the product suspension, which can be directly used for airplane or ground micro-spray. A smaller amount of spray can increase the work efficiency by 10 times, and the work efficiency is nearly a hundred times higher than that of the conventional spray.
3. The particles of the product liquid medicine are fine enough to evenly adhere to the surface of the crop after spraying, forming a dense protective film; supplemented with a good adhesion spreading agent, it can enhance the adhesion performance and resist rain erosion. Generally, the lasting period of fungicides is 5-7 days, but after adopting the dry suspension form, the lasting period can be extended to 10-14 days.
4. The particle size distribution of the product liquid medicine is reasonable, which can not only ensure the quick-acting and lasting effect of the medicine, but also ensure that the medicine can fully and completely contact the surface of the crop to improve the medicine effect.
5. Good safety, unlike some wettable powders, large particles will form a local high concentration on the surface of the crop and cause phytotoxicity. It can be used even in the flowering period, such as 80% sulfur DF. Due to the use of this advanced formulation, it can give full play to the advantages of the product in safety and efficacy during use. It can be used more than sulfur suspension and sulfur powder. In the prevention and treatment of powdery mildew and various harmful mites, the amount of crop is small but the effect is very good.
6. Safe and environmentally friendly formulations, do not use any organic solvents, will not cause solvent pollution problems, no dust, safe for users, and can also avoid phytotoxicity problems caused by agent drift.
7. No dust, no sticking to the packaging bag, more fully utilized, and safer for the operator and the surrounding environment.
8. After the dry suspension concentrate product is diluted with water, the particle size of pesticide particles is very fine, which is easy to play a role on the target and has high efficacy.
9. There are two ways to use dry suspension products: one is the most commonly used, the product is diluted with water (to a suspension) and then sprayed on the stems and leaves; the other is to mix the dry suspension product with soil and spread ( Such as paddy field herbicides).
二. The granulation principle of dry suspension agent
There are two necessary conditions for dry suspension processing: one is to use wet sand milling (ie SC processing) technology to prepare a suspension with an average particle size of 1-10μm; the other is to use spray drying granulation technology , The DF product is obtained directly after removing the water and sieving; the inside of the DF product is a hollow, small, uniform pellet product with a pellet diameter of 50-200 μm, which is smaller than that obtained by other granulation methods. The DF product has a short disintegration time in water, and is generally dispersed in a cloud shape. It can often be spontaneously dispersed within 10 s to form a suspension of the original particle size. The suspension rate is high, and its various indicators are better than other dry granulation methods. WG products.
Post time: Apr-07-2021