Vinyl Trimethoxysilane-CAS 2768-02-7
Product Name: Vinyl Trimethoxysilane
Abbreviation: VTMS / A171 Silane
Alias: Vinyltrimethoxysilane Coupling Agent
CAS No.: 2768-02-7
EINECS No.: 220-449-8
Grade: Industrial High Purity Grade
Purity: ≥98.0%
Appearance: Colorless Transparent Liquid, Slightly Ester Odor
Molecular Formula: C₅H₁₂O₃Si
Molecular Weight: 148.23
MOQ (Minimum Order Quantity): 25KG
Solubility: Insoluble in neutral water, hydrolyzable in weakly acidic water; freely soluble in alcohols, ketones, benzene, ethers and other organic solvents, excellent compatibility with most polymer and silicone systems
Core Efficacy: Dual reactive groups organic silane coupling agent, integrate organic-inorganic bridging, crosslinking curing, surface modification and hydrophobic treatment; effectively improve interface adhesion, material toughness, weather resistance and water resistance of composite materials
Key Characteristics: Contains vinyl organic active group and methoxy inorganic hydrolyzable group, high reaction activity, fast hydrolysis and crosslinking speed, low dosage and high efficiency, excellent high temperature resistance and weather resistance, stable modification effect
Storage Condition: Sealed and stored in dry, cool and ventilated warehouse, away from fire, heat source and strong acid/alkali, avoid long-term air contact to prevent hydrolysis failure, keep tightly sealed after opening
Shelf Life: 24 Months
Application: Widely used in silane cross-linked polyethylene cables, rubber and plastic composite materials, glass fiber coupling, inorganic filler modification, coating adhesion enhancement, waterproof and weather-resistant material processing
Vinyl Trimethoxysilane, VTMS, A171 Silane Coupling Agent, Crosslinking Modifier, Adhesion Promoter, Hydrophobic Treatment, Polymer Composite Modified Silane Raw Material
Vinyl Trimethoxysilane-CAS 2768-02-7
Vinyl Trimethoxysilane is a high-activity bifunctional silane coupling agent, belonging to the core vinyl-series organosilicon modifier. Its molecular structure contains both organic vinyl reactive group and inorganic methoxy hydrolyzable group, forming a unique organic-inorganic dual-modification mechanism.
The methoxy group can hydrolyze in a weak acid environment to generate silanol active groups, which stably bond with hydroxyl groups on the surface of inorganic fillers, glass fibers, and metal substrates; the terminal vinyl group can undergo copolymerization and crosslinking reactions with polymer molecular chains such as polyethylene, polypropylene, and rubber.
It perfectly solves the problem of poor interfacial bonding and easy delamination between inorganic fillers and organic polymers. The product features fast hydrolysis reaction, high crosslinking efficiency, low volatility and excellent weather resistance. It can significantly improve the mechanical strength, tensile toughness, water resistance and aging resistance of composite materials.
As a classic universal silane coupling agent, it is widely used in cable cross-linking, plastic modification, glass fiber reinforcement, coating adhesion enhancement and waterproof material industry, and is a necessary high-efficiency auxiliary raw material for polymer composite material upgrading.
Key Benefits
• Dual Active Groups, Bridging Organic & Inorganic: Unique bifunctional molecular structure, stably connect inorganic substrate and organic polymer, effectively improve interface bonding force and solve composite material delamination and poor compatibility problems.
• High Hydrolysis Activity & Fast Crosslinking: Methoxy group has strong hydrolysis ability, rapid film-forming and curing reaction, high crosslinking efficiency at room and medium temperature, short production cycle and high molding efficiency.
• Significant Material Reinforcement Effect: Greatly improve the tensile strength, impact toughness and wear resistance of rubber and plastic composites, enhance material structural stability, and reduce product defect rate.
• Excellent Waterproof & Weather Resistance: Form dense hydrophobic protective layer on the material surface, effectively prevent water penetration and moisture erosion, significantly improve outdoor aging resistance and service life of products.
• Low Dosage & High Efficiency, Cost-Effective: Small addition amount can achieve obvious modification effect, low volatility, stable performance, no adverse effect on material substrate, and reduce overall production cost.
• Wide Compatibility & Strong Versatility: Compatible with polyolefin, rubber, resin, inorganic powder and other systems, suitable for cross-linking modification, coupling treatment and adhesion enhancement of various composite materials.
Applications
• Silane Cross-Linked Cable Materials: Core crosslinking modifier for silane cross-linked polyethylene (XLPE) cables, improve cable insulation performance, heat resistance and mechanical strength, widely used in wire and cable industry.
• Rubber & Plastic Composite Modification: Used for filling and modification of PE, PP, EPDM and other rubber and plastic materials, improve the dispersion uniformity of inorganic fillers, enhance material toughness and compression resistance.
• Glass Fiber Reinforced Materials: As glass fiber surface coupling agent, improve the bonding degree between glass fiber and resin matrix, enhance the strength and stability of glass fiber reinforced plastics.
• Coating & Adhesive Adhesion Enhancement: Added in industrial coatings, adhesives and sealants, improve the adhesion between coating/substrate, enhance film compactness and weather resistance.
• Inorganic Powder Surface Treatment: Surface hydrophobic modification for talc powder, calcium carbonate, silica and other inorganic fillers, improve powder hydrophobicity and organic system compatibility.
• Waterproof & Weather-Resistant Materials: Used in waterproof coatings, exterior wall weather-resistant materials and building sealants, improve product waterproof permeability and outdoor anti-aging performance.
Certificate Of Analysis (COA)
Test Item | Standard Specification | Test Result |
Product Name | Vinyl Trimethoxysilane | Compliant |
CAS No. | 2768-02-7 | Compliant |
Appearance | Colorless Transparent Liquid, Slightly Ester Odor | Compliant |
Purity | ≥98.0% | 98.72% |
Moisture Content | ≤0.1% | 0.06% |
Refractive Index (25℃) | 1.390~1.405 | 1.396 |
Density (25℃) | 0.950~0.965g/cm³ | 0.958g/cm³ |
Boiling Range | 123~125℃ | Qualified |
Residue on Ignition | ≤0.05% | 0.02% |
Conclusion | Conforms to industrial high-purity grade quality standard | Qualified |
Frequently Asked Questions (FAQ)
• Q1: What is the MOQ of Vinyl Trimethoxysilane?
A1: The standard MOQ is 25KG, and sample orders are supported for formula testing and performance trial production.
• Q2: What certification documents can be provided?
A2: Complete COA, MSDS and full set of global customs clearance documents are available to support export declaration and product filing.
• Q3: What is the recommended addition amount in formula?
A3: Conventional addition ratio is 0.5%-2.0% for filler modification and coating adhesion enhancement; 1.0%-3.0% for cable cross-linking and composite material reinforcement, adjustable according to actual process requirements.
• Q4: What is the difference between Vinyl Trimethoxysilane and common silane coupling agents?
A4: It has dual vinyl and methoxy active groups, with faster hydrolysis and crosslinking speed, better compatibility with polyolefin materials, more significant modification and waterproof effect, and is the preferred raw material for silane cross-linked cable industry.
• Q5: What storage details need attention?
A5: Strictly seal and isolate air, avoid damp environment to prevent premature hydrolysis and failure; keep away from fire and high temperature, store and transport as flammable chemical auxiliary materials.
• Q6: Do you support stable large-batch supply all year round?
A6: Sufficient factory production capacity ensures continuous, stable and large-volume supply throughout the year to support long-term cooperative orders and customized formula demands.
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