Pesticide formulations in the carrier structure, properties and applications

Pesticide formulations in the carrier structure, properties and applications

First, the basic concepts and major role 

Pesticide carrier (Carrier) is the load or diluted pesticide formulation of pesticides in the inert material. Their special structure, with a high surface area, strong adsorption. 

Main functions: 

(1) is thinner. 

(2) adsorbents, thickeners and so on. Pesticide formulations in order to prevent the storage and use with the carrier layer, carriers must have a certain pesticide adsorption and colloidal properties. 

Second, the carrier type, variety and characteristics of 

1, carrier class 

(1) Mineral class 

① elements (such as sulfur); ② silicate (kaolin family, montmorillonite family, talc, etc.); ③ carbonate (such as calcite and dolomite, etc.); ④ sulfate (such as gypsum); ⑤ oxidation material type (lime, magnesium lime, diatom stone); ⑥ phosphate (apatite) ⑦ pumice not stereotypes. 

(2) plant 

Are common corncobs, rice husk powder, rice husk, tobacco powder, walnut shell, saw wood flour. 

(3) class of synthetic carrier 

Include precipitated calcium carbonate hydrate, precipitated calcium carbonate, precipitated silica and other inorganic and some organic hydrate. 

2, feature vector 

Is a mesh structure or multi-lamellar structure, large specific surface area of pesticides there is a strong adsorption capacity and adsorption capacity. 

2.1 diatomite 

Diatomite is a sedimentary biogenic silica. As a pesticide carrier, requires high purity diatomite. 

In pesticide formulations Processing: processing of high content can be used as powder, or the adsorption capacity and compatibility as a small carrier compliance with powder or wettable powder carrier, to regulate the flow of agents and dispersing properties. 

Attapulgite Clay 2.2 

As a pesticide carrier, requires high purity, large surface area and strong adsorption, cation exchange capacity of small, low moisture content, FeO and Fe2O3 content as low as possible. 

Attapulgite in the process of pesticide formulations: attapulgite large surface area and adsorption performance, with thickening, high levels of pesticides can be used as powder carrier and the matrix granules. 

2.3 Bentonite 

Bentonite is a layered hydrous aluminum silicate mineral, used as a pesticide carrier requirements of high purity and low content of sand, strong adsorption, FeO and Fe2O3 content is low. If it is the high silt content, impurities salt (Fe +) high chemical stability of the preparations have a great impact, but the appearance is usually seen. 

Bentonite in processing the application of pesticides: is appropriate for the pesticide wettable powder, granules, water dispersible granules and the suspension of the carrier of dispersants and thickeners. 

2.4 sepiolite 

Sepiolite is a fibrous magnesium-rich clay minerals. 

Sepiolite in pesticide formulations Processing: sepiolite has a large surface area and high porosity, can absorb liquids or low melting point of the pesticide, the most suitable for high levels of powder, wettable powder and granule carrier. Cation exchange capacity because of its small, low concentration of powder is also used as a carrier. 

2.5 Zeolites 

Showed a porous frame structure of aluminum silicate crystal water. 

Zeolite in the process of pesticide formulations: Zeolite surface area and pore structure makes it water molecules and some polar molecules have a strong absorptive capacity, but also slow release after adsorption, was used as a pesticide release carrier-type granules; zeolite ion exchange capacity and high catalytic activity, are not generally suitable for the powder and the powder can be wet pieces of the carrier. 

2.6 Kaolin 

Requirements of the role of water content of pesticide carrier, Fe203 content is low, dispersion and mobility, and cation exchange capacity is small. 

In the process of pesticide formulations: kaolin surface area, porosity and adsorption capacity of small, medium or low content of the general content as the carrier of powder and granule carrier. 

2.7 Synthetic and natural modified polymer carriers 

2.7.1 Silica 

Large surface area silica, adsorption ability, good dispersion, suitable for high levels of WP and the carrier powder. But the cost is high, the general compatibility with other carriers to use. 

2.7.2 PCC 

Fine grain size, moisture content is low, the carrier can be used for WP or modification for the high levels of soluble powder carrier. 

2.7.3 porous resin powder 

Synthetic resin products, functional, absorption rate, disturbance of the chemical agents, granules in the sorbent and carrier, has a strong role in helping extrusion, is also the only foreign company's product. 

2.7.4 Modified Starch 

Also known as modified starch, is the use of physical, chemical or enzymatic means, cutting through the elements, rearrangement, oxidation, or the introduction of substituents at the molecular method to change some of its natural properties, to increase their performance or the introduction of new features, a system the more original starch has better performance and more diverse varieties of starch derivatives. Mainly as a filler granules. 

2.7.5 Glucose 

Full of sugar or glucose, also known as industrial food-grade glucose, starch or rice based upon quality as raw material, amylase liquefaction, saccharification enzyme glucose concentration from the bulk of refined glucose, the bulk of glucose into glucose powder dried after cutting, but also called the entire food-grade glucose powder or powdered sugar. Solid block of white, sweet. Solids ≥ 80%, DE value ≥ 95. Solid particles can be used as a filler agent, and its advantages: have a good water-soluble, shortcomings are obvious: the high moisture absorption of glucose, preparation is easy deliquescence. Glucose itself is also chemically unstable, prone to redox reactions, influence the performance and appearance of the preparations. 

2.7.6 Water-soluble fiber 

At present, some species are trying to apply granules, and its excellent physical and chemical properties of the more prominent, stable! 

Transfer from the above, the development of pesticide formulations blog - pesticide. Blog.sohu.com