Polyether water-soluble silicone oil (PEG/PPG modified silicone) plays an increasingly important role in modern pesticide formulations due to its unique surface activity and compatibility.
Application as a synergist
Wetting and spreading properties
• Reduces the surface tension of the liquid to 22-28 mN/m (pure water 72 mN/m)
• Reduces the contact angle by more than 60% (leaf test data)
• Increases the spreading area on hydrophobic crop leaves (such as rice) by 3-5 times
Penetration-enhancing effect
• When combined with silicone penetrants:
Increases epidermal penetration by 40-70%
Extends the duration of drug effect by 2-3 days
• Less destructive to the wax layer than traditional penetrants
Applications in Dosage Formulation
Suspension Concentrate (SC) Stability
• At a dosage of 0.1-0.5%:
Zeta potential increases by over 15mV
Storage stability up to 2 years (at room temperature)
• Prevents particle agglomeration better than conventional dispersants
Emulsion in Water (EW) Emulsification
• Adjustable HLB value range of 8-16
• Increases the success rate of nanoemulsion formation (particle size <200nm) by 30%
• Low-temperature stability test pass rate of 92% (control group: 78%)
Functional Performance
Anti-Evaporation Performance
• At 35°C:
Reduced evaporation rate of the drug solution by 45-60%
Active ingredient retention doubled
Rainwater erosion resistance
• Simulated rainfall test (50 mm/h):
Drug retention increased by 35-50% compared to conventional formulations
• Significant synergistic effect with polyurethane additives
Safety Advantages
Environmental Friendliness
• Acute oral LD50 > 5000 mg/kg (rat)
• Bioconcentration Factor < 100
Crop Safety
• No reported harm to 20 crops tested
• Reduces conventional adjuvant usage by 30%
Application Notes
Incompatibility
• Pre-test before use with copper preparations
• May hydrolyze in strong acidic conditions (pH < 3)
Usage Guidelines
• Recommended concentration 0.01-0.1% (v/v)
• Best results when prepared and used immediately
Storage Requirements
• Protect from light (half-life > 6 months under UV exposure)
• Avoid freezing (precipitation temperature is typically < -5°C)
Typical Formulation Example
Glyphosate 41% Aqueous Solution:
• Adding 0.05% Polyether Silicone Oil
• Efficacy Comparison:
Weed death time shortened by 24 hours
Control effectiveness increased by 15-20%
Reduced dosage by 30%
Development Trends
Intelligent Formulations
• Environmentally Responsive (Temperature/pH) Controlled Release Systems
• Targeted Delivery Technology Development
Green Improvements
• Introduction of Degradable Segments (e.g., Polylactic Acid Modification)
• Research on Natural Source Alternatives
Polyether water-soluble silicone fluids significantly enhance pesticide efficacy and reduce dosage by improving the wettability, permeability, and stability of pesticides. Their environmentally friendly properties meet the needs of modern agricultural green development and offer broad application prospects in the pesticide adjuvant field. With the advancement of precision agriculture, their functional and intelligent applications will become important research areas.
