Dynasylan® SIVO 210

Dynasylan® SIVO 210 can advantageously be employed in organic solvents as constituent of aqueous sizes or solutions or added to the polymer as an additive. In higher concentrations (1–5 wt.-%) chemical modification can be achieved by reaction with suitable functional monomers or polymers, for example those containing epoxy groups.

Dynasylan® SIVO 210 is an important additive in many applications. Examples are:

• Metal primers
• Foundry resins: as additive to phenolic, furan and melamine resins
• Sealants and adhesives: as primer or additive
• Mineral­filled polymers (composites) or HFFR cables: for pretreatment of fillers and pigments
• Paints and coatings: as additive and primer for improving adhesion to the substrate.

The most important effects which can be achieved using Dynasylan® SIVO 210 are: 

• Mechanical properties, for example flexural strength, tensile strength, impact strength and modulus of elasticity
• Moisture and corrosion resistance

Improvement in processing properties, such as:

• Adhesion
• Filler dispersion
• Rheological behavior: reduction in viscosity, Newtonian behavior
• Higher filler loading

Dynasylan® SIVO 210 contains primary and secondary aminoalkylethoxysilanes. The components are bifunctional organic compounds in which the silicon­functional ethoxy- groups hydrolyze in the presence of water to form reactive silanols, which can be bonded to an inorganic substrate; the organophilic amino group can interact with a suitable polymer. The composition contains partly six hydrolyzable substituents in one molecule. Thus Dynasylan® SIVO 210 is exceptionally suitable to form highly crosslinked networks on and between substrates and in organic matrices.

The hydrolysis of Dynasylan® SIVO 210 in water takes place by acidic catalysis (e.g. formic or acetic acid at a pH 3). To achieve solubility in organic solvents simply add 2­4 wt.­% of water per wt.­% of Dynasylan® SIVO 210. Upon stirring for 5h the solutions are ready for use.

Examples of suitable inorganic substrates are glass, 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 are phenolic resins, furane resins, melamine resins, PA, PBT, PC, EVA, modified PP, PVB, PVAC, PVC.

The secondary amino group in Dynasylan® SIVO 210 provides high basicity at somewhat lower reactivity compared to the primary amino groups. This is of major advantage in e.g. HFFR cables where the silane is added to the polymer matrix. Homogeneous distribution and bonding/networking of Dynasylan® SIVO 210 to the inorganic filler can commence unless bonding to organic materials (e.g. polymers) will proceed. Excellent crosslinking properties make Dynasylan® SIVO 210 a preferred component in the silylation of inorganic filler surfaces and in corrosion­resistant primer systems for metal pretreatment.

Store in the originally closed drum Dynasylan® SIVO 210 has a shelf life of at least 1 year.