A unique combination of performance and eco-friendliness

Whether in automotive, aerospace or construction, the advantages of bonding over mechanical fastening are being recognized in more and more target markets of the adhesives industry. As a result, the requirements placed on their products in terms of adhesion, mechanical properties or water resistance are continuously increasing. Dynasylan® high-performance additives have always played an important role in enabling the industry to beat these expectations.

Adhesion on critical substrates like plastics or metals is a key challenge in the adhesive industry. It comes along with the difficult task to maintain other key performance dimensions such as mechanical properties at a suitable level. VPS SIVO 260 and VPS SIVO 280 are Evonik’s Next Generation Silane Adhesion Promoters, which have been developed to master this challenge. The multifunctional silane oligomers allow to formulate state-of-the-art adhesives, sealants and silicones with excellent adhesion on critical substrates along with increased mechanical properties and reduction of volatile organic compounds. Used as an additive in moisture curable adhesives and sealants, they eliminate the need for special primers in numerous bonding applications.

VPS SIVO 260 and VPS SIVO 280 can be used in a wide range of adhesion technologies including silane modified polyurethane/polyether (SMP), MS-Polymer and oxime/alkoxy silicone technologies.

This renders them unbeatable, particularly in challenging applications in the transportation and construction industries as well as in industrial assembly and do-it-yourself markets. 

+ good | ++ very good | +++ exceptional

*Technical evaluation of diverse test series (with different SMP binders) in Evonik's AT lab.

The special structures of these multifunctional silane oligomers lead to higher flash and boiling points. In addition, they can improve the compatibility between the adhesion promoter and the polymer/resin and thus ensure decisive performance advantages. When used as part of a silyl-terminated polyurethane (STPU) adhesive, both silanes led to excellent adhesion on difficult substrates. Single Lap shear test results indicate a 27 % adhesion increase for VPS SIVO 260 on polycarbonate. The adhesion of VPS SIVO 280 on polymethyl methacrylate more than doubled. Both multifunctional silanes showed improved mechanical properties and an outstanding primerless adhesion to aluminum. In RTV-1 oxime silicones both products led to greater tear and tensile strengths, while improving at the same time flexibility and adhesion to polyvinyl chloride substrates. All in all, VPS SIVO 260 and SIVO 280 exhibited excellent wetting on difficult substrates. They formed weather- and moisture-resistant bonds to substrates that are partially difficult to adhere. 

One of the main advantages of VPS SIVO 260 and SIVO 280 is their beneficial eco-profile. Traditional monomeric (amino-functional) silanes, for example, have a comparatively low boiling point and a higher release of volatile organic compounds (VOCs) during curing. Due to their oligomeric structure, VPS SIVO 260 and VPS SIVO 280 release significantly less methanol during curing. Additionally, the oligomers can be added to the formulation in comparatively large quantities without the need for labeling.

Because of their excellent environmental friendliness, the products are particularly suitable for formulating adhesives and sealants for the construction and consumer (DIY) business, or the automotive industry. After all, these will later often be used in the interiors of buildings or vehicles. However, VPS SIVO 260 and 280 naturally demonstrate their superior performance everywhere.