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|Title: ||Physico-chemical aspects of aqueous gloss emulsion paints|
|Authors: ||Slater, Christine|
|Issue Date: ||1987|
|Publisher: ||© Christine Slater|
|Abstract: ||The formulation of an aqueous paint involves the mixing of a very
complex chemical system. The objective of this study was to investigate
the colloidal and surface properties of this type of system. From this
an overall picture of the physico-chemical interactions occurring
between the pigment and polymer, and the effect of the soluble
components, could be obtained. By a greater appreciation of the basic
chemistry of the paint system, improvements of the final commercial
products cculd be possible.
A simple paint system was designed which contained industrial
pigment, poly(vinylacetate) polymer and soluble ccnstituents including
sodium hexametaphosphate (dispersant), and sodium dodecylsulphate
(emulsifier). A non ionic thickener, sodium hydroxyethylcellulose, and
an ionic thickener, carboxymethyl cellulose was also included.
The effect of the alumina coating was investigated by testing both
alumina coated pigment, RTC90, uncoated ccnventional rutile, RD rutile
and alumina pigment, Hydral. The effect of these soluble aluminium
species on the pclymer was also demonstrated.
The interaction of the soluble components on the polymer and
pigment WoS investigated using microelectrophoresis and adsorption
techniques. The distribution of mcbilities in colloidal samples was
obtained for both coated and uncoated pigments in a variety of solutes. The effect of thickener concentration on paint formulations and
millbases was measured at constant temperature in precision bore glass
columns. The data was analysed using an interactive computer programme
based on the work of Carstensen & Su (1970a 1970b). The effect of
thickener with respect to flocculation, film formation and gloss was
also estimated using optical and infrared techniques.
This study has given an idea of the complexity of paint formulations
and the need for further model studies on the individual
components of the system.|
|Description: ||A Doctoral Thesis. Submitted in partial fulfilment of the requirements for the award of Doctor of Philosophy of Loughborough University.|
|Appears in Collections:||PhD Theses (Chemistry)|
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