Dynasylyan® AR is a milky-white, low-viscosity, pre-hydrolyzed ethyl polysilicate hybrid binder, that contains a mixture of silica derived from TEOS, ethanol, sulfuric acid catalyst and other components. The silica content ranges from 19-21%.
Dynasylan® AR is especially suited for use in:
• Ceramic casting molds (precision casting, lost wax or casting shell methods) and ceramic molding (ceramic form or SHAW molding processes)
• Refractory materials
• 2-pack zinc dust anti-corrosion paints, (e.g. shop-primers).
Dynasylan® AR in conjunction with especially refractory forming materials results in ceramic casting molds that have highly precise surfaces and dimensions.
In zinc rich paints with a zinc content above 95% Dynasylan® AR binds the zinc and allows for the formation of hard coatings with an effective galvanic protection.
Tags
- #Evonik Functional Silanes
- #refractory
- #feuerfesterzeugnisse
- #giessformen
- #gießformen
- #Evonik Silanes
- #zinc dust paints
- #2k-zinkstaubfarben
- #binder for 2-pack zinc rich paints
- #zweikomponenten
- #binder for ceramic casting molds
- #zinkstaubfarben
- #Silane producer
- #preparation of a ethylpolysilicate hydrolysate and silica sol
- #hybridbinder
- #refractory binder
Typical Applications
The degree of hydrolysis and acidity have been optimized for the required reactivity and sufficient storage stability.
By the addition of alcohol and/or water it is possible to vary the SiO₂-content and the curing properties. The hydrolysis and condensation process starts during the production of the binder.
By a shift of the pH-value this process can be modulated. This shift is achieved by addition of fillers, pigments, additives, or by the evaporation of solvent or exposure to atmospheric moisture.
The resulting silicic acid gel cures rapidly at ambient temperatures in air. The process of curing can be accelerated through the addition of alkaline catalysts.
Benefits at a glance
Product Details & Documents
Technical Data Sheets
Further Information
Storage:
Dynasylan® AR is a pre-hydrolyzed binder and thus will age, especially close to heat sources. The containers should not be stored in direct sunlight.
Local regulations have to be followed and applied.