Rheological characterization of the application behavior of sealants
Relevant for: adhesives, hotmelts, sealants and plastisols
Application oriented rheological measurements were carried out on three sealant samples. The measurements were conducted using an Anton Paar MCR rheometer, the Peltier temperature control unit, and a plate-plate measurement system PP25 (Ø 25 mm). The temperature was 20 °C for all tests.
From the application it is known that one sealant (S1) has good rheological properties, whereas the other two sealants (S2 and S3) lead to different problems. S2 still flows after the force is removed from the cartridge, while S3 needs a too high force to be pressed out.
Due to large filler particles and other large structures in sealants, which are highly filled polymer systems, a plate-plate measuring system with a gap size of 1 mm was used.
Oscillation tests are used to measure the sealants for two reasons:
- Rotational tests are limited for these kinds of samples since the sealants tend to move out of the gap at higher shear rates.
- Oscillatory tests give the additional information on the elastic behavior of the sample, i.e. the viscous (G’’) and elastic (G’) properties can be distinguished.
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