The pesticide formulation industry is continuously transforming toward green development, chemical reduction and efficiency improvement. Environment-friendly formulations such as aqueous suspension concentrates, water-dispersible granules and wettable powders are gradually replacing traditional emulsifiable concentrates. As a functional inorganic carrier and rheological auxiliary agent, silica exerts multiple functions in pesticide formulations by virtue of its porous structure, high specific surface area, chemical inertness and favorable adsorption performance. In water-dispersible granules and wettable powders, silica can serve as a carrier to adsorb technical pesticides, improve powder fluidity, prevent material caking and enhance the disintegration and dispersion performance of preparations. Within aqueous suspension systems, silica can construct a three-dimensional network thixotropic structure, effectively inhibiting sedimentation of solid pesticide particles and reducing stratification and caking during storage. It also delivers thickening and anti-splash effects to the liquid medicine. However, abundant silanol groups on silica surface will affect the pH value and dispersion stability of the system. Improper powder selection or unreasonable dosage control can easily trigger abnormal viscosity rise and reduced suspension rate, directly affecting pesticide efficacy release in fields. How to adjust the rheological properties of suspension systems relying on silica while balancing storage stability and dispersibility after dilution has become an important research topic for pesticide formulation development.

　　Different pesticide formulations and physicochemical properties of technical pesticides impose significantly different requirements on silica indicators. Aqueous suspension concentrates use water as the medium. Ground technical particles are dispersed in water, requiring silica with proper specific surface area and hydrophilic surface features. It can build a stable thixotropic network at low dosage to prevent sedimentation at rest, and its viscosity drops rapidly after dilution and stirring to facilitate spray application. The production of water-dispersible granules involves spray granulation. Silica needs outstanding adsorption capacity to carry active technical ingredients, improve particle strength so that pellets are not prone to breakage during transportation and storage, and can quickly disintegrate and disperse once immersed in water. Wettable powders require loose silica powder to reduce bulk density, boost grinding efficiency and help the liquid medicine spread evenly on leaf surfaces. For different technical materials including herbicides, fungicides and insecticides, silica manufacturers need to adjust powder pore volume, particle size distribution and surface hydroxyl content to develop special hydrophilic grades adapting to processing technologies of various pesticide formulations.

　　Grinding and dispersion processes of pesticide formulations directly determine the functional performance of silica. Sand milling is commonly adopted for producing aqueous suspensions, where silica, pesticide technical materials and wetting dispersants are ground together. Grinding duration, grinding media and feeding sequence all affect silica dispersion. Insufficient grinding fails to break silica agglomerates, making it impossible to form a stable thixotropic structure and resulting in easy stratification of suspension concentrates. Excessive grinding will destroy the original porous structure of silica and weaken its rheology regulation capacity. Many pesticide formulators encounter the problem that lab samples maintain stable storage performance while sedimentation and caking occur after production scale-up. The root cause lies in the difficulty in replicating the uniform silica dispersion of lab conditions during mass grinding. Professional silica suppliers provide supporting guidance on formulation processes, assisting pesticide enterprises to optimize grinding parameters and screen compatible dispersing additives, lowering quality risks brought by formulation scale-up.

　　Pesticide reduction policies and promotion of green formulations keep driving demand growth for special silica. In the past, many small and medium-sized pesticide enterprises used cheap fillers to cut formulation costs. Such ordinary fillers feature poor rheological performance, short shelf life of preparations and easy precipitation, which affects field pesticide efficacy. As domestic pesticide management standards keep tightening and end farmers raise requirements for formulation stability and efficacy consistency, the industry gradually shifts toward high-performance silica. Hydrophilic precipitated silica requires no complex surface modification, enjoys good compatibility in aqueous pesticide systems, can steadily raise suspension rate and extend the shelf life of preparations. Some high-end pesticide formulations have long relied on imported silica. In recent years, domestic powder enterprises continuously optimize powder production processes with steadily improved product stability. Leveraging local technical services and fast delivery advantages, they are gradually capturing market share in domestic pesticide formulations.

　　Competition in the silica market for pesticides has shifted from simple price competition to competition of comprehensive formulation solutions. Pesticide formulation systems are complex. The acidity, alkalinity, solubility and crystal form of technical ingredients interact with silica. The pH value and soluble salt content of silica must be strictly controlled to avoid chemical reactions with active technical ingredients that cause decomposition and failure of pesticides. High-end pesticide formulations demand high batch consistency of raw materials. Minor fluctuations in silica indicators will lead to deviations in suspension rate and viscosity of finished products. Many domestic silica products show ideal performance in small sample tests, yet suffer from large indicator fluctuations during large-scale continuous production, making it hard to enter the supply chains of leading pesticide manufacturers. Silica enterprises need to build application laboratories for pesticide formulations to carry out suspension stability tests, thermal storage stability tests, disintegration tests and compatibility evaluation of pesticide efficacy. They deeply participate in customers’ formulation development and transform from powder raw material suppliers into formulation service providers for pesticide preparations.

　　In the long run, with the continuous advancement of agricultural modernization, the proportion of green and environment-friendly pesticide formulations will keep rising, and the market scale of special silica for pesticides will maintain steady expansion. Future R&D of silica products will iterate toward low soluble salt content, high adsorption capacity and controllable rheology, and special grades suitable for high-content technical formulations will be developed. Customized powder will also be developed for emerging formulations such as seed treatment agents and slow-release pesticides. Silica enterprises capable of precisely regulating the porous structure of silica, familiar with processing technologies of various pesticide formulations and equipped with complete formulation application evaluation capabilities will form deep bonds with downstream pesticide customers and continuously tap growth opportunities in the green agriculture track.