Abstract:
This invention relates to a hardener composition Η for an aqueous epoxy resin based two-pack coating formulation wherein the hardener composition Η comprises reaction products of at least difunctional epoxides H1, at least difunctional hydroxypolyoxyalkylenes Η2, at least difunctional hydroxyaromatic compounds H3, unsaturated fatty acids H42 having acarboxyl functionality of more one which comprise the so-called dimer fatty acids, secondary amines H having additional carbonylimine-blocked primary amino groups, obtained by reaction of amines H51 having at least one primary amino group and at least one secondary amino group 1 with carbonyl compounds H52 which have an aldehyde or ketone carbonyl group, optionally, hydroxy-functional secondary amines H6 having at least one secondary amino group and at least one hydroxyl group, and further optionally, amines H7 having at least one primary, and at least one tertiary amino group, wherein the unsaturated fatty acids H42 are incorporated into the hardener in the form of beta-hydroxy esters, and wherein water is added to liberate the 20 blocked primary amino groups.It also relates to a process for the preparation of the hardener H, to aqueous two-pack coating compositions with an epoxy resin E, and to the use of these coating compositions as first or primer layer to prepare multilayer coatings together with solvent-borne coating compositions for the upper layer.
Abstract:
A method for applying a polymeric heat-bondable powder coating on an elongate tubular article having a surface extending circumf erentially around the article, for example a pipe. The article is heated to a temperature at which the powder bonds to the surface. The powder is spray applied to the surface of the article while hot, the powder is permitted to bond to the surface to form a coating on the surface. Heat or pressure or heat and pressure are applied. The pressure is applied uniformly on the whole of the coating on the surface in order to densify the coating. The coated article is then allowed to cool.
Abstract:
Provided herein are surface treatments such as paints, coatings, stains, varnishes, sealants, films, inks, and the like, containing heat labile component/carrier combinations and methods for making the formulations suitable for treating surfaces. The surface treatments and/or the treated surfaces can be subjected to elevated temperatures at or above which the heat labile component alone decomposes, reacts, or volatilizes. Because the heat labile component adsorbed on the carrier survives the elevated temperature, the resulting treated surfaces exhibit properties derived from the heat labile component(s). Resulting treated surfaces can exhibit properties derived from one or a combination of heat labile components including, but not limited to bacteriocides, fungicides, algaecides, viruscides, insecticides, antibiotics, enzymes, repellents (animal and insect), herbicides, pheromones, molluscicides, acaricides, miticides, rodenticides, fragrances, and the like. Otherwise incompatible components can similarly be included in surface treatments using the carrier technology.
Abstract:
Apparatus for producing an activated polymerisable formulation includes a receptacle (not shown) for containing the polymerisable formulation. The formulation is fed by a pump (not shown) through a pipe (4) as represented by arrows (6) and into a static mixer (8). Walls which define the static mixer are transparent to UV radiation so that fluid within the static mixer can be subjected to UV radiation by use of an irradiation device which surrounds the static mixer. Downstream of mixer (8), the fluid passes into a (10) pipe (12) and via a nozzle (14) can be directed to a desired location. The polymerisable formulation is suitably an epoxy or urethane-based system. The apparatus may be used in the repair of cavities in structures, for example airport runway aprons.
Abstract:
What is disclosed is a process for coating half parts for packaging comprising the following steps: a half part of sheet metal, in particular ultrafine sheet metal, is provided; the half part is placed on a receptacle; at least a first masking means is placed on the half part, in order to at least partially outwardly conceal the half part; a powder coating is applied to the outer side of the half part, and the powder coating is melted.