Knowde Enhanced TDS
Identification & Functionality
- Chemical Family
- Chemical Name
- Base Chemicals Functions
- CASE Ingredients Functions
- Composite Materials Functions
- Plastics & Elastomers Functions
- Technologies
- Product Families
Features & Benefits
- Base Chemicals Features
- CASE Ingredients Features
- Materials Features
- Reactivity
- The alkoxy group of Dynasylan® MEMO hydrolyzes in the presence of water (and a suitable catalyst such as acetic acid) to produce methanol and reactive silanol (Si-OH) groups which can bond to a variety of inorganic substrates.
- The methacryl groups interacts with the polymer.
- Examples of suitable inorganic substrates are glass, glass fibers, glass wool, mineral wool, silicic acid, quartz, sand, cristobalite, wollastonite and mica; also suitable are aluminum hydroxide, kaolin, talc, other silicate fillers, metal oxides and metals.
- Examples of suitable polymers include unsaturated polyester, acrylates and vinyl esters.
Applications & Uses
- Markets
- Applications
- Applicable Processes
- Compatible Polymers & Resins
- Base Chemicals End Uses
- Industrial Additives End Use
- Application Characteristics
- Dynasylan® MEMO is used as adhesion promoter in application such as:
- a constituent of glass fiber sizes (glass fiber fillers for unsaturated polyester resins and polyolefins)
- a finish for glass fabrics used in unsaturated polyester resins
- as a surface modifier for pigments and fillers for thermosets (unsaturated polyester, MMA), thermoplastics (polyesters and polyolefins)and elastomers
- as an additive for filled, peroxide-crosslinked elastomers l as an additive for casting resins (unsaturated polyester, MMA)
- Dynasylan® MEMO is either applied to the inorganic substrate as a pretreatment by dipping, spraying, or coating or it may be added directly to the resin matrix (additive process). For pretreatment, the silane may be used
- neat
- dissolved in an organic solvent
- dissolved in a mixture of organic solvent and water for partial hydrolysis
- completely hydrolyzed in aqueous solution.
- To prepare an aqueous pretreatment solution, approx. 1-5 wt.% Dynasylan® MEMO is dissolved in water that has been adjusted to pH 3-4 with acetic acid. The solution will turns clear when the silane has fully hydrolyzed. The clear solution of Dynasylan® MEMO hydrolysate must be used within 1-2 days, if it turns cloudy again it may no longer be used. In the additive process, Dynasylan® MEMO is mixed with the resin or polymer before or together with the filler. A prerequisite for this method is compatibility of the silane with the resin since the silane must not react prematurely with the resin.
- When used correctly Dynasylan® MEMO can achieve the following properties, for example in a highly-filled unsaturated resin system:
- optimum dispersion of the fillers/pigments
- reduction in settling of the fillers/pigments
- a reduction in viscosity and improved flow properties of the resin
- improved mechanical properties of the molded products
- improved resistance of the molded products to boiling water, acids and alkalis
- Dynasylan® MEMO can be used as monomer during resin synthesis (e.g. latex dispersions). It may partially replace the methacryl-functional monomers (usually 0.5-3%, but sometimes up to 20%). The thus incorporated silane functionality can lead to improved properties in the final application (e.g. coating or sealant) of such resins:
- wet adhesion strength
- chemical resistance
- mar resistance
- Dynasylan® MEMO is used as adhesion promoter in application such as:
- 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
- Clear colorless liquid.
- Soluble in
- Alcohols, Aliphatic and aromatic hydrocarbons
- Technical Data
| Value | Units | Test Method / Conditions | |
| Density (at 20°C) | approx. 1.04 | g/cm³ | DIN 51757 |
| Boiling Point (at 1013 hPa) | approx. 255 | °C | DIN 51356 |
| Viscosity (at 20°C) | approx. 2.8 | mPa.s | DIN 53015 |
| Flash Point | approx. 110 | °C | DIN 51758 |
| Refractive Index (n 20, D) | approx. 1.432 | — | DIN 51423 |
| Residual Moisture | 0.22 | % | — |
| Evolved VOC (Methanol) | 387.0 | g/kg | — |
Regulatory & Compliance
- Certifications & Compliance
Technical Details & Test Data
- Couples Fillers and Polymers
- An important characteristic of silanes is that they allow the coupling of inorganic mineral fi llers and organic polymers through a chemical bond.
- As a conse-quence of the coupling, the mechanical properties of the fi lled compounds are significantly improved.
- Examples include the use of silane-treated glass fi bers in polypropylene, quartz in unsaturated poly-ester, and aluminum trihydroxide in ethyl vinyl acetate.
- Scanning electron microscope (SEM) images of the broken edge of a quartz-fi lled unsaturated polyester.
- Silane coupling improves the adhesion of the fi ller to the polymer. The gap between the fi ller and the polymer is eliminated.
Packaging & Availability
- Packaging Information
Dynasylan® MEMO is supplied in 25 kg, 215 kg drums and 1.000 kg bulk containers.
Storage & Handling
- Shelf Life
- 12 months