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Add：1500 Hangtang Road, Jinhui town, Fengxian District, Shanghai

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Zip code：201405

E-mail：admin@pilarquim.com.cn

Pilarbio

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核心技术

Core technology N

Dispersible Oil suspension (OD)

Microcapsule suspension (CS)

Microcapsule suspension is a kind of microcapsule with semi permeable membrane formed by wrapping pesticide active substance (core) with polymer material as the wall or membrane through chemical, physical or physicochemical methods, and they are stably dispersed and suspended in water as a continuous phase in a certain concentration, which is called microcapsule suspension.

Suspension concentrate (SC)

In recent years, with the deepening understanding of the hazards of emulsifiable pesticides, water-based formulations have been highly valued. According to the statistics of the world pesticide industry association, the proportion of EC in the world's pesticide preparations is very large, and the organic solvent in the environment is more than 1 million tons per year. In one hand, these non-pesticide active substances increase the cost of pesticide preparation, which consumes about billions of dollars every year in the world; on the other hand, a large number of organic solvents cause great damage to the environment. China is the second largest pesticide producer in the world, producing 900000~1 million tons of pesticide preparations every year. China's water-based formulations account for a small proportion of the total preparations. Compared with other major producers of pesticides, the structure of pesticide formulations in China is facing severe challenges, and the demand for new water-based formulations is also more urgent. In this context, water-based preparations, such as suspensions, microemulsions, water emulsions, and water-based agents, are widely concerned, and their development technology has become a hot spot. Related basic theoretical research, such as surfactant technology, nanoparticle technology, laser particle size and streaming potential detection technology, grinding technology and fluid mechanics, have also gradually extended to the field of pesticide, providing a necessary means and theoretical basis for further research on Suspension Concentration.

Dry flowable（DF）

Dry flowable（DF）

Dry Flowable (referred to as DF) is a solid particulate product obtained directly from pesticide by wet grinding and then spray dried and granulated to remove moisture. China's pesticide registration department uses the name of WG (water dispersible granule) instead of DF to register WG and DF. According to the different production processes, WG is divided into dry process and wet process. DF is water dispersible granule produced by wet process. Due to the process, some DW is registered as water dispersing granule, while some DW is registered as dry suspending agent, which puzzles the users. In fact, there are obvious differences between dry WG and wet WG (i.e. DF) in appearance, and their water entry performance is also different, so it is not difficult to distinguish them.

Microcapsule Suspension- Suspension Concentration

Microcapsule suspension is a kind of compound preparation, which is to compound microcapsule suspension and suspension, so that the product can meet the requirements of quick effect and extend the period of validity. It is a new formulation with both quick effect and effectiveness, and can expand the prevention and control objects, with a broad market prospect.

Dispersible Oil suspension (OD)

An insoluble pesticide solid active component in non-aqueous medium (mainly including oil-based medium or solvent medium), which is processed into fine particles and suspended in non-aqueous medium by the action of surfactants and additives to form highly dispersed and stable suspension liquid preparation, called oil suspension agent (of), oil suspension agent used for water dilution is called dispersible oil suspension agent, code is OD Oil suspension agent can increase the adhesion of pesticide on plant leaves and reduce the surface tension, so as to make the efficacy play better.

Seed Treatment

Seed Treatment agents play an obvious role and advantage in reducing and enhancing pesticide efficiency and preventing diseases and pests in crop seedlings and even the whole life cycle. Seed Treatment agents play an increasingly important role in agricultural production. Pilarquim has already launched two kinds of Seed Treatment agents, Miao De Yi and seed guard, which are loved and sought after by many growers. In 2020, Pilarquim will introduce three new Seed Treatment agents, Miao Wanjin, Miao Jianqiang and Miao Mei Qi. In addition to continuing to walk along the line of disease and insect pests, microcapsule technology will also be applied to Seed Treatment agent, so that Seed Treatment agent can play a longer and better efficacy.

Dispersible Oil suspension (OD)

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Dispersible oil suspension（OD)

1. The difference between dispersible oil suspensions and other easily mixed forms

In the national standard GB / T 19378-2017 pesticide dosage form name and code, the dispersible oil suspension agent is described as: dispersible oil suspension agent, English name oil-based suspension concentration (oil dispersion), code OD, which refers to the effective ingredients dispersed in non-aqueous medium to form a stable suspension liquid preparation, generally diluted with water.

Dispersible oil suspensions (OD) and suspending agents (SC) and oil suspensions (OF) belong to suspension preparations. The difference between the three is shown in Table 1.

Table 1 Main differences of three dosage forms

Name of dosage form	Medium	Usage mode
Suspending agent (SC)	Water	Diluted with water
Dispersible oil suspension (OD)	Oil (non-aqueous medium)	Diluted with water
Oil suspension (OF)	Oil (non-aqueous medium)	Dilute with oil

It can be seen that OD and OF, which are easily confused, are essentially identical in terms of processing, but there are differences in the way of use. In the past, some domestic and foreign literatures did not make a clear distinction between OD and OF, resulting in the mixing of two dosage forms. Now, most of the countries in China and most countries in the world use the diluted oil suspending agent which is changed to OD.

Dispersible oil suspending agent is a safe and environment-friendly dosage form. Its product composition generally includes:

1) Effective components of pesticides: the effective components of pesticides that can be processed into dispersible oil suspensions should be insoluble solids in non-aqueous media, and their melting points should be higher to ensure the solid state of Pesticide Components in the process of grinding. These active ingredients should be stable in non-aqueous media, without decomposition or reaction, to ensure the effective content of pesticide active ingredients.

2) Non aqueous media: non-aqueous media have great influence on the performance of the dispersible oil suspensions. Generally, non-aqueous media with high flash point, low volatility and low toxicity are commonly used, and the price is low, to ensure the safety, environmental protection and cost control requirements of the preparation. Non aqueous media include oil based medium and solvent medium. Oil based media include vegetable oils (such as corn oil, soybean oil, etc.), mineral oil, biodiesel, or their mixtures. Solvent media include: higher aliphatic hydrocarbons, polyols, liquid esters (such as two methyl ortho two carboxylic acid, dibutyl phthalate), methyl oleate and so on.

3) Dispersant: it is used to inhibit the flocculation and coagulation of particles in the oil phase, and to stabilize the suspension of oil phase particles, to ensure that the dispersed suspension can be diluted with water to form a uniform suspension. The emulsifiers used in individual products can also play a role in dispersing, so there is no dispersant.

4) Emulsifier: it is the key to develop the dispersible oil suspension agent. The emulsifier selected must ensure that the non-aqueous medium has good emulsification and dispersion in water, with a large amount of use (generally 15% - 20%), and the appropriate emulsifier must be selected according to the actual non-aqueous medium selected, such as vegetable oil, mineral oil, biodiesel and methyl oleate.

2. Advantages and disadvantages of dispersible oil suspending agent

The dispersible oil suspension basically keeps the advantages of the suspension: no low flash point organic solvent is used, and the problems of flammability, explosion and poisoning are avoided in the production; no dust is produced in the production and use process, which is safe for the operator and the user; the toxicity and irritation are low; the oil is used as the medium, which is an environmentally friendly dosage form; in the actual application, the help of non-aqueous medium can make it more effective.

The disadvantages of dispensable oil suspensions are mainly concentrated in the following points: difficult processing technology; less varieties of dispersers can be selected, more emulsifiers need to be added, and high technical content is required for formula screening; the finished products are prone to stratification and sedimentation; compared with the suspending agent, the price of oil medium is higher, so the cost of finished products increases more.