Rheology control of organic coatings with new hydrophobic silicas

The rheological effects of hydrophobic pyrogenic silicas were examined using binder systems designed, in particular, for automobile top coats. Rheological measurements to characterize the flow behaviour, especially with regard to sagging, in the relevant shear rate and shear stress were carried out...

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Bibliographic Details
Published inProgress in organic coatings Vol. 24; no. 1; pp. 29 - 41
Main Authors Christ, U., Bittner, A.
Format Journal Article Conference Proceeding
LanguageEnglish
Published Lausanne Elsevier B.V 01.06.1994
Elsevier Sequoia
Subjects
Applied sciences
Automobile top coats
Coatings. Paints, varnishes and inks
Exact sciences and technology
Film formation and curing, properties, testing
Mechanism of rheology control
Polymer industry, paints, wood
Pyrogenic silicas
Rheology control
Sagging behaviour
Shear strain jump
Shear thinning
Viscoelastic properties
Pyrogenic silicas
Mechanism of rheology control
Sagging behaviour
Rheology control
Viscoelastic properties
Automobile top coats
Shear strain jump
Shear thinning
Paint tearing
Hydrophobization
Defect
Adjuvant
Paint
Silica
Rheological properties
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Summary:The rheological effects of hydrophobic pyrogenic silicas were examined using binder systems designed, in particular, for automobile top coats. Rheological measurements to characterize the flow behaviour, especially with regard to sagging, in the relevant shear rate and shear stress were carried out in addition to practical tests. By means of a shear strain jump experiment the rheological conditions during and directly after paint application were simulated using a rheometer. Based on the results obtained and additional measurement of viscoelastic parameters a new approach to understanding the mechanism of rheology control with pyrogenic silicas in coating systems was developed.
ISSN:0300-9440
1873-331X
DOI:10.1016/0033-0655(94)85004-6