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The material selection platform
Adhesives Ingredients
The material selection platform
Adhesives Ingredients

Silyl Polyether - Epoxy Adhesives

Adhesives Formulation

Applicable Base Polymer Properties

Epoxy adhesives are generally more resistant to a wide variety of liquid environments than other structural adhesives. However, they are generally considered to be very rigid systems, and as such they do not have exceptionally good impact or peel resistance unless modified. Flexibility can be provided through the resin or hardener constituents by incorporating large groups in the molecular chain, which increase the distance between crosslinks.
Modern flexibilizers include isocyanate monomers and prepolymers, which react with the hydroxy groups on epoxy resins to give tough, flexible hybrids. Silicone polymer containing amine termination will also react with epoxy groups to produce more flexible epoxies, while still maintaining good chemical and thermal stability.

Typical Formulation Ingredients

Phase
Ingredient
Parts by weight
Part A 
SilylGrade, Supplier SAX 350, Kaneka 
xxx 
Part A 
Epoxide hardenerGrade, Supplier e.g., tertiary amine 
x 
Part A 
Compatibilizer Grade, Supplier Alkyl amino silane 
x 
Part B 
Epoxide Grade, Supplier Epikote 828, Shell 
xx 
Part B 
Silyl hardenerGrade, Supplier e.g., dialkyltincarboxylate 
x 
Part B 
Demineralized water 
xxx 

Processing

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Resulting Properties

Silyl-terminated polyether can be blended with epoxy resins to form elastic adhesives at room temperature. In this system small rigid epoxy particles are chemically linked by an elastic polyether phase. A typical formulation is shown in the table above. Elongation and peel strength (90-100 N/25mm) is significantly increased with a moderate decrease in tensile properties (tensile shear strengths are 6-10 MPa). Tuning of the mechanical properties (i.e., strength from the epoxy and high impact resistance from the polyether) can be achieved by adjusting the ratio and selection of the silylated polyether and the epoxy resin.

Tips and Tricks

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