Paste manufacturing
Bonding pastes and repair putties are produced with high-speed mixing and
dispersion processes.
High concentrations of fillers are used in the formulations to compensate for
the polymerisation shrinkage of UP-resins. These fillers can also serve other
purposes, like making the paste lightweight or corrosion resistant. In some
formulations glass fibres are mixed in to increase the strength of the joint.
Bonding pastes are applied to the substrates manually or by means of dosing
equipment.
The choice of the resin and the formulation of the bonding paste for different
applications is very important. Bonding pastes, used in the boat building
industry must be able to absorb high shear forces. These bonding pastes often
contain glass fibres as filler. In lightweight construction applications (e.g.
sandwich constructions) bonding pastes with low density fillers, such as
hollow glass spheres, are used. Other types of bonding pastes serve high
temperature or corrosion resistant applications.
