Knowde Enhanced TDS
Identification & Functionality
- Chemical Family
- Chemical Name
- CASE Ingredients Functions
- Plastics & Elastomers Functions
- Product Families
Features & Benefits
- Materials Features
- Reactivity
- In the presence of moisture the methoxy (Si-OCH3) groups of Dynasylan® VTMO hydrolyze to produce methanol and reactive silanol (Si-OH) groups which can bond to a variety of inorganic substrates or react with each other to form siloxane bonds (Si- O-Si).
- The organophilic vinyl end of Dynasylan® VTMO can also react with a suitable polymer initiated by a peroxide.
- Dynasylan® VTMO is an ideal crosslinker.VTMO are used as drying agents in moisture-curing hybrid-sealing compounds.
- Dynasylan® VTMO reacts with unwanted water, even when other silanes are present due to formulation for other purposes (e.g. adhesion promotion).
- Thus Dynasylan® VTMO gives sealing compounds improved storage stability and prevents the compound from curing pre- maturely.
Applications & Uses
- Applications
- Compatible Polymers & Resins
- Plastics & Elastomers Processing Methods
- Application Characteristics
- Moisture curing of polymers
- Dynasylan® VTMO is suitable for the preparation of moisture- curing polymers, e.g. polyethylene.
- The characteristic feature of this process is peroxide-initiated grafting of the vinylsilane to the polymer during extrusion.
- After grafting, the polymer can still be processed as a thermoplast. Only upon treatment with moisture (in a 80-100 °C waterbath, steambath, or even at ambient conditions), the polymer chains are linked together; thereby forming a crosslinked polymer.
- This reaction can be accelerated by using a catalyst. Silane crosslinked polyethylene is widely used as cable isolation, and sheathing mainly in low voltage applications as well as for hot water/sanitary pipes and underfloor heating.
- Heat resistance is the main reason for the crosslinking of polymers for cable applications, but crosslinking can also improve the following properties: tear- and crack resistance, chemical resistance, abrasion resistance, memory effect.
- Dynasylan® VTMO may also be used as a co-monomer for the preparation of different polymers such as polyethylene or acrylics.
- Those polymers show an improved adhesion to inorganic surfaces and they can also be crosslinked with moisture as described above.
- Adhesion promotion and surface modification
- Because of its ability to react with inorganic fillers as well as with organic polymers (activated by e.g. peroxides or radiation)
- Dynasylan® VTMO acts as an efficient adhesion promoter for various mineral-filled polymers, improving mechanical and electrical properties especially after exposure to moisture.
- Once bonded to an inorganic filler, Dynasylan® VTMO hydrophobates the filler surface, improving the compatibility of fillers with polymers, leading to a better dispersibility, reduced melt viscosity and easier processing of filled plastics.
- The pretreatment of glass, metals, or ceramic surfaces with Dynasylan® VTMO improves the adhesion of coatings on these surfaces and can thus improve the corrosion resistance.
- Dynasylan® VTMO as co-monomer for polymer dispersions
- Polymer dispersions (e.g. styrene acrylics), modified with Dynasylan® VTMO show improved adhesion strenght in wet conditions and wet scrub resistance.
- Dynasylan® VTMO as moisture scavenger
- Dynasylan® VTMO reacts rapidly with water.
- Even traces of water can be removed with Dynasylan® VTMO.
- This effect is used widely in sealants.
- Other applications of Dynasylan® VTMO
- Dynasylan® VTMO can easily bond to OH-groups.
- Hydroxyl containing polymers e.g. functionalized silicones, may be modified with Dynasylan® VTMO, thereby introducing reactive vinyl groups into the polymer chains.
- The vinyl group of Dynasylan® VTMO is activated by its proximity to silicon, which makes it an attractive molecule for different organic syntheses.
- Moisture curing of polymers
- Substrate Recommendations
Recommended for :
- Steel: cold rolled steel (CRS). abraded surface 0.3 –0.6% Mn / 0.08 – 0.13% C / 0.05% S / 0.04% P
- Aluminum: alloy (3105 H 24) 96.8 – 97.4% Al / 1.0– 1.5% Mn / 0.6% Si / 0.05 –0.2% Cu
- Copper
Properties
- Physical Form
- Appearance
- Colorless. low - viscous liquid
- Odor
- Typical aromatic odor
- Technical Data
| Value | Units | Test Method / Conditions | |
| Density (at 20°C) | approx. 0.97 | g/cm³ | DIN 51757 |
| Boiling Point (at 1013 hPa) | approx. 123 | °C | DIN 51751 |
| Viscosity (at 20°C) | approx. 1 | mPa.s | DIN 53015 |
| Flash Point | approx. 25 | °C | DIN 51755 |
| Refractive Index (n 20, D) | approx. 1.390 | — | DIN 51423 |
| Residual Moisture | 0.37 | % | — |
| Evolved VOC (Methanol) | 649.0 | g/kg | — |
Regulatory & Compliance
- Certifications & Compliance
Packaging & Availability
- Packaging Type
- Packaging Information
Dynasylan® VTMO is supplied in 25 kg or 195 kg drums or 900 kg containers.
Storage & Handling
- Shelf Life
- 12 months
- Storage Conditions
- The containers must remain tightly sealed during storage and kept in a cool, well aired place. The product should be protected against humidity.
- In the unopened container the shelf life of Dynasylan® VTMO is min. 12 months from delivery.