heptamethyltrisiloxane factory&supplier
Heptamethyltrisiloxane
Everything you need to know about our products and company
Basic Product Information
TYPICAL PROPERTIES
| Appearance | colorless transparent liquid |
| purity (GC),% | >99 |
| Molecular weight | 222.5 |
Physical Properties
Chemical Properties
Safety Certifications
Product Functions
Reduces surface energy (15–25 mN/m) to enhance hydrophobic/oleophobic properties (contact angle >110°).
Improves substrate wettability, boosting adhesion of coatings and adhesives (peel strength +30–50%).
Acts as a high-efficiency leveling agent, eliminating surface defects (e.g., orange peel, cratering) in industrial products.
Lowers melt viscosity (by 40–60%), enhancing processing fluidity for composites.
Forms a nanoscale protective network to improve weather resistance (UV stability ≥90% after 1000h) and chemical stability (resistance to acids/alkalis).
Serves as a reactive intermediate in silane crosslinking reactions (curing efficiency +20–35%).
Applications
Applications: Modification of PP, PE, ABS, and other polymers.
Key Benefits: Enhances mechanical properties (e.g., impact resistance, flexibility) and processability.
Applications: Additives for silicone rubber, EPDM, etc.
Key Benefits: Improves crosslinking efficiency and thermal stability (e.g., reduces compression set by 15–25%).
Applications: Pre-treatment for anti-corrosion coatings.
Key Benefits: Enhances coating adhesion (peel strength +20–40%) and extends substrate lifespan.
Applications: Encapsulants, conductive adhesives.
Key Benefits: Provides moisture resistance (＜0.1% water absorption) and stable electrical conductivity (10⁻³–10⁻⁵ Ω·cm).
Applications: Lithium battery separators, photovoltaic materials.
Key Benefits:
Battery separators: Improves thermal stability (＞200°C shutdown) and ionic conductivity.
PV materials: Enhances UV resistance (＞95% retention after 25 years).
Core Advantages
| Advantages | Industrial Value | Technical Indicators |
| Super Wetting | Improves surface adhesion of materials, enhances uniformity of coatings/printing Improves wettability of inks and coatings on hydrophobic substrates | Contact angle reduced to <10° |
| Thermal Stability | Suitable for high-temperature processing scenarios (e.g., injection molding, extrusion) Prolongs service life of materials in high-temperature environments | Continuous resistance to 250℃ |
| Energy Efficiency | Reduces processing energy consumption and production cycle Minimizes equipment wear and production costs | Processing energy consumption reduced by 20-30% |
| Multifunctional Compatibility | Widely compatible with various resin systems, enhancing formulation flexibility Supports composite function development (e.g., flame retardancy and antistatic synergy) | Compatible with 20+ resin systems |
Market Value
Global Market Overview and Growth Drivers of HMTS
Overall Industrial Sector: The global market size of HMTS is approximately US$350–420 million, with the textile sector accounting for 35%. The remaining 65% (about US$230–270 million) is distributed across the following industrial applications:
Coatings & Inks (30%)
Electronics & Semiconductors (25%)
Personal Care & Cosmetics (20%)
Industrial Cleaning & Release Agents (15%)
Others (10%, including pesticides, adhesives, etc.)
Miniaturization of Electronics Industry:
HMTS is used as a solvent for temporary bonding adhesives in semiconductor packaging, driven by surging demand for 5G/AI chips.
Transition to Green Coatings:
Replaces toxic solvents like xylene/DMF, compliant with EU REACH regulations.
High-Efficiency Pesticide Additives:
Enhances leaf surface spreadability of insecticides, fueled by global precision agriculture trends.
Future Trends (2030 Outlook)
Semiconductor Localization: Demand from Chinese manufacturers like Yangtze Memory and SMIC will drive localization of electronic-grade HMTS (potential market >US$120 million).
Green Pesticides: The HMTS additives market is expected to grow at 8–10% annually under global precision agriculture trends.
Experimental Data & Case Studies
Data:
PP + 0.3% additive: Melt flow index increased from 25g/10min to 38g/10min (ASTM D1238).
Surface gloss of products improved by 35% (ASTM D523).
Case Study:
Automotive Parts Manufacturer: Injection molding cycle shortened by 15%, annual production increased by 2 million pieces.
Data:
Epoxy resin + 1% additive: Thermal conductivity increased from 0.8 to 1.2W/m·K (ASTM D5470).
Moisture sensitivity level certified as MSL 1 (JEDEC J-STD-020).
Case Study:
Top 3 Domestic Chip Packaging Enterprises: Product yield improved by 8%.
Data:
Coating uniformity deviation <2% (measured by laser thickness gauge).
Electrolyte contact angle reduced from 75° to 12°.
Case Study:
Leading New Energy Enterprise: Separator liquid absorption rate increased by 40%, battery cycle life extended.
Preparation Process, Core Technologies, and Precautions
Preparation Processes
Raw Material Pretreatment:
Industrial-grade trimethylchlorosilane and hexamethyldisiloxane undergo strict purification (e.g., distillation, adsorption) to remove metal ions and unsaturated impurities (<50 ppm).
Catalysts (concentrated sulfuric acid) and organic solvents (toluene, ≥99.5% purity) are prepped.
Reaction Process:
Hydrolysis: In a stirred reactor, toluene and water (volume ratio 3:1) are mixed, and trimethylchlorosilane is slowly added dropwise at 20–40°C to form trimethylsilanol. HCl byproduct is released.
Condensation: Hexamethyldisiloxane is added post-hydrolysis, and the temperature is raised to 60–80°C. Under sulfuric acid catalysis, condensation occurs with continuous removal of HCl and low-boiling volatiles via distillation.
Post-Treatment:
Neutralization: Sodium carbonate solution (5–10% wt) is added to neutralize residual acid (pH 6–7).
Washing & Separation: The mixture is washed with deionized water, and the organic phase is separated (toluene layer).
Drying & Distillation: The organic phase is dried over anhydrous Na₂SO₄, then vacuum-distilled (50–80°C, 5–10 kPa) to collect HMTS (purity ≥95%).
Raw Material Preparation:
Methyl hydrogen silicone oil (Si-H content 1.5–2.0 mmol/g), vinyl trimethoxysilane (≥98%), chloroplatinic acid-isopropanol catalyst (Pt concentration 2000–5000 ppm), and isopropanol solvent.
Addition Reaction:
In a dry reactor, methyl hydrogen silicone oil and isopropanol are mixed, followed by the catalyst. Vinyl trimethoxysilane is added dropwise at 80–110°C under nitrogen, with stirring for 3–5 hours until Si-H conversion >95% (monitored by FTIR).
Hydrolysis-Polycondensation:
Water (molar ratio H₂O:Si=1.2:1) and acetic acid (pH 3–4) are added to hydrolyze the intermediate into silanols, which then polycondense at 50–70°C for 2–3 hours.
Separation & Purification:
Filtration: Removes catalyst residues (e.g., Pt complexes) via diatomaceous earth filtration.
Vacuum Distillation: Isopropanol and byproducts are removed at 60–90°C/10–20 kPa.
Membrane Separation (Optional): For electronics-grade HMTS, nanofiltration (100–300 kDa) removes trace metal ions (<1 ppm).
Core Technologies
Impurity Control Technology:
Measures: Distillation columns (efficiency ≥99%) and activated carbon adsorption remove Fe³⁺, Al³⁺, and unsaturated silanes.
Impact: Reduces side reactions (e.g., gel formation) and improves product clarity (APHA ≤20).
Continuous Reaction Technology:
Equipment: Tubular reactors with static mixers enable residence time control (5–10 min) and flow rates up to 1000 L/h.
Benefits: 30% higher productivity than batch processes, with energy consumption reduced by 25%.
Byproduct Treatment Technology:
HCl Recovery: A three-stage absorption tower converts HCl to 31% industrial hydrochloric acid (purity ≥99%), achieving 95% recovery rate.
Catalyst Optimization Technology:
Modification: Complexing chloroplatinic acid with divinyltetramethyldisiloxane improves stability (service life extended from 5 to 10 batches).
Recovery: A resin adsorption system recovers 90% of Pt, reducing catalyst costs by 40%.
Precision Reaction Control:
Online Monitoring: Infrared spectroscopy tracks Si-H and vinyl group concentrations in real time.
PID Control: Automated systems maintain temperature (±1°C) and pressure (±5 kPa) for consistent product quality (molecular weight distribution ≤1.2).
Large-Scale Purification Technology:
Multi-Effect Distillation: A 5-column system achieves electronics-grade purity (≥99.99%) with a single pass.
Membrane Filtration: Ultrafiltration removes submicron particles (<0.1 μm), meeting semiconductor cleaning standards (particle count <100 particles/mL).
Precautions
Packaging & Ordering
Packaging: 200kg/1000kg plastic drums (customizable).
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Basic Product Information Product Name: Heptamethyltrisiloxane Appearance: Colorless Transparent Liquid TYPICAL PROPERTIES Appearancecolorless transparent liquidpurity (GC),%>99 Molecular weight222.5 Physical Properties Colorless transparent liquid, high purity (≥99.9%), low volatility, non-residue. Chemical Propertie.
Basic Product Information Product Name: Heptamethyltrisiloxane Appearance: Colorless Transparent Liquid TYPICAL PROPERTIES Appearancecolorless transparent liquidpurity (GC),%>99 Molecular weight222.5 Physical Properties Colorless, odorless transparent liquid with adjustable volatility (completely volatilizes within 3-8 mi.
Basic Product Information Product Name: Heptamethyltrisiloxane Appearance: Colorless Transparent Liquid TYPICAL PROPERTIES Appearancecolorless transparent liquidpurity (GC),%>99 Molecular weight222.5 Physical Properties Appearance: Colorless transparent liquid. Boiling Point: 165–175°C. Volatility: Moderate evaporat.
Basic Product Information Product Name: Heptamethyltrisiloxane Appearance: Colorless Transparent Liquid TYPICAL PROPERTIES Appearancecolorless transparent liquidpurity (GC),%>99 Molecular weight222.5 Physical Properties Colorless transparent liquid Boiling point: 165–175°C Controlled volatility (complete volatilizat.
