| 摘要 |
<p>The lacs are appropriate for the cataphoretic deposit of a coating on electrically conducting substrates used as cathodes. They are prepared with 5 - 35% by weight at least of an epoxy resin, 2 - 20% by weight at least of a ketonic and/or hydrocarbonated resin, 15 - 60% by weight at least of a cationic synthetic resin with functional groups, present with a concentration of 10-70% as a dispersion or solution, 5 - 30% by weight at least of an organic cross-linking agent, solid at room temperature and 0 to 70% by weight of pigments and/or additives. All these compounds are mixed in a ground aggregate state, in one or a plurality of steps, one step at least occuring in a wet medium, so as to form an homogeneous lac which has a particle size of less than 100, preferably less than 15 (Alpha)m. The mixture is then brought with water at a solid particle content required by a substrate which is preferably comprise between 1 and 30% by weight. The method allows to obtain a good homogeneity of the particles and thereby a uniform thickness of the coating layer exhibiting a particularly high resilience resistance. </p> |
