Objetivo
The objectives of the research are:
-to determine and evaluate the physico-chemical parameters governing the coalescence of the latex particles during film formation
-to evaluate and determine the parameters influencing pigment flocculation in latex paints
-to determine and evaluate the factors governing the efficiency of thickeners in controlling the rheological properties of the paints at application and drying
-to develop an explanative model based on the data derived from the experimental programme and on theoretical considerations, to formulate high performance latex paints for use by the industrial collaborators to develop their own proprietary systems.
The different investigations carried out by the Consortium during this four-year research project have allowed to make evident and evaluate:
- the physico-chemical parameters influencing pigment flocculation, the object being to obtain the best pigment distribution and dispersion;
- the physico-chemical parameters influencing the forces acting in promoting or impeding the sintering and the coalescing process of the latex particles during film formation.
- the factors governing the efficiency of thickeners in controlling the rheological properties of the latex-based paints on storage, at application as well as during drying.
More particularly, from the model set up for the pigment dispersion study it is predicted that:
- Single Crystal Fraction decreases exponentially with PVC for a given pigment/latex size ratio
- Effect of PVC follows a simple mathematical relationship based purely on geometric factors.
- Single Crystal Fraction increases as latex particle size decreases.
- Increasing ionic strength first causes clustering of pigment particles. At very high ionic strength clustering of latex particles is predicted.
In terms of compliance with environmental regulations or requirements water-based paint systems have potential as attractive replacements for the conventional solvent-based systems.
However, continuous problems with latex-based paints which impair them gaining a share in the industrial sector are their permeability (compared to solvent-based coatings) toward water-vapour and other potentially harmful pollutants, the occurrence of pigment flocculation, and their inability to impart a sufficient glossy aspect mainly due to poor rheology of the liquid paints at application and during film formation.
Ámbito científico
Tema(s)
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1342 LIMELETTE
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