heptamethyltrisiloxane factory&supplier
Heptamethyltrisiloxane
Everything you need to know about our products and company
Heptamethyltrisiloxane is emerging as a powerful adjuvant in modern agriculture, leveraging its unique properties to enhance crop protection product performance. This organosilicone compound acts as a super-spreader, dramatically improving the efficacy of pesticides, herbicides, and fungicides through superior surface coverage and penetration.
The material’s extremely low surface tension (16-18 mN/m) enables complete wetting of waxy leaf surfaces, including those of difficult-to-treat plants like cabbage and lotus. This allows agricultural formulations to achieve uniform coverage even under challenging field conditions, reducing product runoff and improving rain fastness.
Heptamethyltrisiloxane helps overcome resistance issues in weeds and pests by ensuring complete contact and absorption of active ingredients. Its rapid biodegradation profile and low toxicity make it an environmentally responsible choice for sustainable farming practices.
As agriculture faces increasing pressure to produce more with less, this advanced adjuvant technology represents a crucial tool for enhancing food production efficiency while minimizing environmental impact.
Basic Product Information
TYPICAL PROPERTIES
| Appearance | colorless transparent liquid |
| purity (GC),% | >99 |
| Molecular weight | 222.5 |
Physical Properties
Chemical Properties
Product Functions
Disrupts Cuticular Wax Layer:
Leverages ultra-low surface tension (18–20 mN/m) to rapidly wet and spread on wax-coated leaves/stems, overcoming hydrophobicity.
Targeted Delivery:
Capillary action penetrates key sites (stomata, leaf veins), boosting systemic pesticide translocation efficiency (+25–40%).
Film-forming Protection:
Forms a micro-nano mesh film upon drying, firmly adhering to crops to reduce wash-off (rainfastness retention >85%).
Controlled Release:
Slows active ingredient degradation, maintaining efficacy post-rainfall/irrigation (field efficacy retention ≥90%).
Enhanced Utilization:
Improves spray coverage uniformity (droplet density +30–50%) and reduces blind spots.
Dosage Reduction:
Cuts pesticide input by 20–30% under equivalent efficacy, aligning with “reduce-use, enhance-efficiency” policies.
Chemical Stability:
Wide pH tolerance (3–9), inert to common pesticides (e.g., organophosphates, pyrethroids).
Formulation Versatility:
Compatible with EC (emulsifiable concentrate), SC (suspension concentrate), WG (water-dispersible granules).
Anti-drift:
Reduces droplet surface tension, improves size uniformity (DV50: 150–300 μm), and minimizes drift losses (<5%).
Anti-evaporation:
Slows droplet evaporation in hot/dry conditions, increasing UAV spray deposition rate (+15–25%).
Applications
Crop Types
Cereals: Rice, wheat, corn, sorghum
Tubers: Potato, sweet potato
Legumes: Soybean, peanut, mung bean
Fruit Trees: Citrus, apple, pear, grape, peach
Vegetables: Tomato, cucumber, pepper, eggplant, leafy greens
Industrial Trees: Tea, rubber, oil palm
Medicinal Herbs: Ginseng, Panax notoginseng, goji berry
Floriculture: Rose, chrysanthemum, orchid
Protected Agriculture: Greenhouse vegetables, nursery flowers
Pesticide Types
Non-selective: Glyphosate, glufosinate
Selective: Pendimethalin, acetochlor
Post-emergent: Quizalofop, nicosulfuron
Organophosphates: Chlorpyrifos, dichlorvos
Pyrethroids: Lambda-cyhalothrin, bifenthrin
Neonicotinoids: Imidacloprid, thiamethoxam
Triazoles: Tebuconazole, difenoconazole
Strobilurins: Azoxystrobin, pyraclostrobin
Others: Mancozeb, chlorothalonil
Promoters: Gibberellins, brassinolide
Inhibitors: Paclobutrazol, chlormequat chloride
Core Advantages
| Advantage | Agronomic Value | Data Support |
| Instant Penetration Tech | Spray penetration time reduced to 8–15 seconds | Leaf contact angle ↓ from 85° to 12° (NY/T 1860) |
| Rainfastness Tech | Efficacy retention >90% after 4h rainfall | Simulated rainfall test (GB/T 8321.10) |
| Dosage Reduction & Synergy | Chemical cost reduced by 25% per mu | Field trials (Jiangsu rice fields, 2023) |
| Aerial Application Compatibility | Drift reduced by 40% | UAV spray tests (droplet size <100μm) |
Market Value
Market Size & Growth Trends
2023 Market Size: HMTS in pesticide applications valued at USD 180–220 million, accounting for 12–15% of the global pesticide adjuvant market.
Growth Forecast (2024–2030): Projected CAGR 7–9%, reaching USD 300–350 million by 2030.
Key Drivers:
Pesticide reduction policies (e.g., China’s “Double Reduction” initiative, EU Farm to Fork Strategy).
Rising pest/weed resistance requiring high-efficiency penetrants.
Adoption of aerial application (UAV spray), demanding low-surface-tension adjuvants.
Technological Advantages
Ultra-spreading performance: Contact angle <10° (vs. >30° for conventional adjuvants), enabling uniform film formation on leaves.
Hard water tolerance: Stable across pH 4–9, compatible with diverse pesticide formulations.
Replaces high-risk adjuvants (e.g., nonylphenol ethoxylates/NPEs), compliant with:
China’s Restricted/Banned Pesticide Adjuvant List
EU Regulation (EC) No 1107/2009
Future Growth Opportunities
Resistance Management:
HMTS reduces pesticide input by 20–30% amid global herbicide-resistant weeds (>500 species).
Bio-pesticide Synergy:
Acts as a synergist carrier for plant oil-based insecticides (e.g., pyrethrins).
Precision Agriculture:
Integrates with variable-rate spraying to optimize pesticide utilization (field efficiency +15–25%).
Experimental Data & Case Studies
Rice Herbicide Synergy Trial
Glyphosate + 0.2% Heptamethyltrisiloxane:
Weed necrosis accelerated from 7 days → 3 days.
Rainfastness: 88% efficacy retention after 2h rainfall (vs. 52% for conventional formulations).
Heilongjiang Agricultural Reclamation Group:
Applied across 100,000 mu (≈6,667 hectares), reducing weeding costs by 30%.
Awarded provincial Green Agriculture Certification.
Citrus Red Mite Control
Abamectin + 0.3% Adjuvant:
24-hour mite mortality rate increased from 70% → 95%.
Residual efficacy extended to 15 days (vs. 10 days for standard treatment).
Ganzhou Orchard, Jiangxi:
Spray frequency reduced from 4 → 2 times/season.
100% pesticide residue compliance rate in fruits.
Aerial Spray Optimization
Droplet deposition density increased by 35%, drift rate <5% (National Standard: ≤15%).
Wheat Field Unified Control, Henan:
Saved CNY 180,000/season (≈USD 25,000) in UAV spray costs.
Preparation Process, Core Technologies, and Precautions
Preparation Processes
Raw Material Preparation
Primary materials: High-purity trimethylchlorosilane and hexamethyldisiloxane.
Auxiliaries: Catalyst (e.g., concentrated sulfuric acid), solvent (toluene), and neutralizing agent (sodium carbonate).
Quality control: Multi-stage purification and rigorous impurity testing (e.g., residual chloride <50 ppm) to meet pesticide-grade safety standards.
Hydrolysis Reaction
Conditions: Reactor with stirring and reflux systems; low-temperature (0–20°C) environment.
Procedure:
Slowly add trimethylchlorosilane to a water-solvent mixture.
Control dripping rate (<5 mL/min) and reaction temperature to minimize byproducts (e.g., siloxane oligomers).
Output: Trimethylsilanol with >98% conversion efficiency.
Condensation Reaction
Conditions: Temperature 50–80°C, acidic catalysis.
Procedure:
Add hexamethyldisiloxane to trimethylsilanol.
Remove low-boiling byproducts (e.g., HCl) via fractional distillation.
Key metric: Achieve >95% heptamethyltrisiloxane selectivity.
Post-Treatment
Neutralization: Add Na₂CO₃ to pH 6.5–7.5.
Purification:
Water washing (3 cycles) → phase separation → drying (molecular sieves).
Vacuum distillation (10–15 mmHg, 80–100°C) → final purity ≥99.5%.
Raw Material Preparation
Primary materials: Hydrogen-terminated silicone oil, vinyltrimethoxysilane.
Catalyst: Chloroplatinic acid (H₂PtCl₆, 50–100 ppm Pt loading).
Solvent: Isopropanol (HPLC grade, H₂O <0.1%).
Hydrosilylation Reaction
Conditions: Dry nitrogen atmosphere, 80–120°C.
Procedure:
Mix silicone oil and catalyst, then gradually add vinyltrimethoxysilane (molar ratio 1:1.1–1.3).
Monitor exotherm (<5°C/min) to prevent runaway reactions.
Intermediate: α,ω-divinylsiloxane with Si-H conversion >99%.
Hydrolysis & Polycondensation
Hydrolysis: Add deionized water (H₂O:Si-H = 1.2:1 molar) under pH 4–6.
Polycondensation:
Stir at 60°C for 4–6 hours.
Adjust pH to 8–9 for silanol condensation.
Yield: 85–90% heptamethyltrisiloxane.
Post-Treatment
Filtration: Remove Pt catalyst via 0.2 μm membrane.
Distillation: Short-path distillation (150°C, 1 mmHg) → pesticide-grade product.
Core Technologies
Ultra-Purification:
Molecular distillation for trimethylchlorosilane (purity >99.9%).
Adsorption beds (activated carbon + zeolite) for hexamethyldisiloxane.
Reaction Optimization:
PID-controlled jacketed reactors (±0.5°C accuracy).
Online FTIR monitoring of silanol intermediates.
Impurity Control:
Triple-wash protocol (NaHCO₃ → DI water → brine).
Molecular sieve drying (H₂O <50 ppm).
Catalyst Engineering:
Heterogenized Pt catalysts (e.g., Pt/SiO₂) for 5-cycle reuse.
Ligand-modified systems (e.g., Karstedt catalyst) for 98% selectivity.
Process Intensification:
Microreactor technology for precise thermal control.
Real-time GC-MS tracking of byproducts (e.g., methane).
Quality Assurance:
ICP-OES for Pt residue testing (<1 ppb).
ISO 9001-certified batch consistency protocols.
Safety Guidelines
Avoid strong oxidizers (e.g., KMnO₄, HNO₃) → risk of explosive silane gas.
Amber glass containers at 5–30°C; shelf life 12 months.
Nitrile gloves + ANSI Z87.1 goggles + Type N95 respirator.
Packaging & Ordering
Packaging: 200kg/1000kg plastic drums (customizable).
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