Knowde Enhanced TDS
Identification & Functionality
- Chemical Family
- Chemical Name
- CASE Ingredients Functions
- Plastics & Elastomers Functions
- Technologies
- Product Families
Features & Benefits
- CASE Ingredients Features
- Materials Features
- Reactivity
- In the presence of moisture the ethoxy (Si-OCH2CH3 ) groups of Dynasylan® VTEO hydrolyze to produce ethanol 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® VTEO can also react with a suitable polymer initiated by a peroxide.
Applications & Uses
- Applications
- Compatible Polymers & Resins
- Plastics & Elastomers Processing Methods
- Application Characteristics
- Moisture curing of polymers
- Dynasylan® VTEO is suitable for the preparation of moisture- curing polymers, e.g. polethylene.
- 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 an 80-100°C waterbath, steambath, or even at ambient conditions), are the polymer chains linked together via the formation of siloxane bonds, 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® VTEO may also be used as a comonomer 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® VTEO acts as an adhesion promoter for various mineral-filled polymers, improving mechanical and electrical properties especially after exposure to moisture.
- Once bonded to an inorganic filler, Dynasylan® VTEO hydrophobizes the filler surface, improving the compatibility of fillers with polymers, leading to a better dispersibility, reduced melt viscosity and easier processing of filled plastics.
- Surface coating of glass, metal or ceramics with Dynasylan® VTEO will improve not just adhesion, especially of acrylic systems, but also corrosion or scratch resistance.
- Dynasylan® VTEO as co-monomer for polymer dispersions
- Polymer dispersions (e.g. styrene acrylics), modified with Dynasylan® VTEO show improved adhesion strenght in wet conditions and wet scrub resistance.
- Dynasylan® VTEO as moisture scavenger
- Dynasylan® VTEO reacts rapidly with water.
- Even traces of water can be removed with Dynasylan® VTEO.
- This effect is used widely in sealants.
- Other applications of Dynasylan® VTEO
- Dynasylan® VTEO can easily bond to OH-groups.
- Hydroxyl containing polymers e.g. functionalized silicones, may be modified with Dynasylan® VTEO, thereby introducing reactive vinyl groups into the polymer chains.
- The vinyl group of Dynasylan® VTEO 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. 0.9 | g/cm³ | DIN 51757 |
| Boiling Point (at 1013 hPa) | 156.0 | °C | DIN 51751 |
| Dynamic Viscosity (at 20°C) | 0.7 | mPa.s | DIN 53015 |
| Flash Point | 38.0 | °C | DIN EN 13736 |
| Refractive Index (n 20, D) | approx. 1.397 | — | DIN 51423 |
| Residual Moisture | 0.28 | % | — |
| Evolved VOC (Methanol) | 726.0 | g/kg | — |
Regulatory & Compliance
Technical Details & Test Data
- Improved Mechanical Properties:
- For oligomeric vinyl silanes, the absence of peroxide results in poor tensile strength. In the presence of peroxide, however, the overall picture changes dramatically.
- As the ATH couples to the EVA, tensile strength increases and water pick-up is reduced, both through increasing the crosslink density and also by rendering the compound hydrophobic.
- Elongation at break is not signifi cantly aff ected by the presence of peroxide.
- Oligomeric vinylsilanes perform better than monomeric vinyl silanes, even at a lower concentration of 1.6 phr.
- At these low silane levels, the vinyl silane or peroxide ratio has to be monitored carefully.
- At a silane concentration of 1.6 phr, the peroxide concentration should not exceed 0.04 phr because of the risk of scorching.
Oligomers outperform monomers in mechanical properties.
Packaging & Availability
- Packaging Type
Storage & Handling
- Shelf Life
- 12 months