Dynasylan® 1124

• Dynasylan® 1124 is a bifunctional organosilane possessing a reactive secondary amine where the silicon-functional methoxy- 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. Due to 6 hydrolyzable alkoxy substituents present in one molecule, Dynasylan® 1124 is exceptionally suitable to form highly crosslinked networks on and between substrates and in organic matrices.
• The hydrolysis of Dynasylan® 1124 in water takes place by acidic catalysis (e.g. formic or acetic acid at a pH of 2-3). In order to achieve primer solution in organic solvents simply add 2-4 wt.-% of water per wt.-% of Dynasylan® 1124. Upon stirring for 5h the solutions are ready for use.
• Examples of suitable polymers are epoxy resins, polyurethanes, phenolic resins, furan resins, melamine resins, PA, PBT, PC, EVA, modified PP, PVB, PVAC, PVC, acrylates and silicones.
• The secondary amino group in Dynasylan® 1124 provides high basicity at somewhat lower reactivity compared to primary amino groups. This is of major advantage in adhesives and sealants where the silane is added to form e.g. silane capped urethane prepolymers.
• Exceptional crosslinking properties make Dynasylan® 1124 a preferred component in the silylation of inorganic filler surfaces and in corrosion-resistant primer systems for metal pre- treatment.
• Dynasylan® 1124 can be used as a multi-purpose Dynasylan®, as an adhesion promoter and for the retroactive modifi cation of suitable pre-polymers.
• However, Dynasylan® 1124’s main strength lies in its function as an adhesion promoter in polyurethane – either directly as an additive or as a highly efficient primer component.
• With this secondary aminosilane, excellent adhesion properties can be achieved on problematic polymer substrates, e.g. polycarbonate, which suggests its use in automobile applications.
• Because of its structure, Dynasylan® 1124 is also suitable for the manufacture of silane-terminated polyurethanes; strongly crosslinked (high modulus area) pre-polymers are thus possible.
• Has been proven as a highly effi cient adhesion promoter in many polyurethane systems (formulations).
• In solvent-based primer applications, due to its extraordinarily good adhesive properties in diffi cult-to-stick synthetic materials, Dynasylan® 1124 is far superior to conventional aminosilanes.
• Has a very high crosslinking potential due to a total of 6 alkoxy groups, which is particularly advantageous in high modulus structural adhesives.
• As secondary aminosilane, accelerates the production of silane-terminated PU binders (basis polymers) and, where necessary, also their adhesives and sealants.
• Reacts quickly and without residue with free isocyanate groups to form hydrophobic, heat stable urea groups.
• Rapid reaction with NCO groups, also without a catalyst.
• Increased cohesion density through double silicon function.

Dynasylan® 1124 is an important additive in many applications.

Examples are:

• metal primers
• mineral fiber insulating materials, abrasives: as additive to phenolic resin binders
• foundry resins: as additive to phenolic, furan and melamine resins
• adhesives and sealants: as primer or additive
• mineral-filled composites: for pre-treatment 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® 1124 are:

improvement in product properties, such as

• flexural strength, tensile strength, impact strength and modulus of elasticity
• moisture and corrosion resistance
• durability at high temperature and humidity

improvement in processing properties, such as

• wet-out
• homogeneous distribution of inorganic fillers in polymer matrices
• higher filler loading
• excellent primerless adhesion
• rheological behavior: reduction in viscosity, Newtonian behavior

• Dynasylan® 1124 can advantageously be employed in organic solvents or added in situ as a pure substance to the polymer.
• 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® 1124 is supplied in a convenient small sized package 25 kg, 200 kg drums and 1.000 kg IBC container.