摘要:
A water-dilutable coating agent for preparing the base layer of a multilayer coating. The coating agent contains pigments and optionally flow-control agents, thixotroping agents, fillers, organic solvents and other customary auxiliaries. The coating agent contains as a binder an aqueous polyuretane dispersion which has a polyuertane resin acid number of 5 to 70 and which as been prepared by reacting:(A) a linear polyether diol and/or polyester diol having terminal hydroxyl groups and a molecular weight of 400 to 3,000 with(B) a diisocyanate in such a molar ratio that an intermediate product is formed which has terminal isocyanate groups,(C) and reacting the intermediate product with a compound which has two groups which are reactive toward isocyanate groups and at least one group which is capable of forming an anion and which has been neutralized with a tertiary amine before the reaction, converting the second intermediate product, obtained from (A), (B) and (C) into a predominantly aqueous phase and(D) reacting the isocyanate groups which are still present with a diamine and/or polyamine having primary and/or secondary amino groups.
摘要:
A two-layer metal-effect coating, composed of a base layer which contains metal pigments and of a clear top coating, at least the base layer being obtained from a coating agent which contains as the film-forming binder a polymer resin which was obtained by copolymerizing olefinically unsaturated compounds, wherein the polymer resin is obtained by copolymerizing(a) 1.0 to 50.0% by weight of acrylonitrile, methacrylonitrile or a mixture thereof(b) 0.1 to 10.0% by weight of a compound having 2 or more polymerizable olefinic double bonds;(c) 40.0 to 98.9% by weight of other copolymerizable compounds, and(d) up to 5% by weight cellulose ester; with the total amount of the components a, b, c and d being 100% by weight.
摘要:
The invention relates to a coating composition for the preparation of the base coat of a multilayer enamel consisting of at least one base and one transparent protective coat, the said coating composition containing binders based on organic resins, metallic pigments, organic solvents and, if appropriate, other pigments as well as customary additives and auxiliaries. The coating composition contains, as binders, (A) polyurethane elastomers and/or polyurea elastomers, (B) polyesters and (C) polycondensates partially etherified with monoalcohols and consisting of melamine, benzoguanamine and/or urea with formaldehyde. The invention further relates to a process for the preparation of coatings using the coating composition, and to a substrate coated with a multilayer enamel.
摘要:
The use of a composition which is liquid under standard conditions (20° C., 1 bar) as a coating material, wherein the composition comprises a) an unsaturated polyester resin composed of α-olefinically unsaturated polycarboxylic acids, polyols, and optionally further compounds, b) compounds with vinyl ether groups (vinyl ethers for short), and c) optionally α-olefinically unsaturated polycarboxylic acids or their monoesters or diesters, where the sum of the double bonds of the α-olefinically unsaturated polycarboxylic acids from a) and optionally of the compounds c) to the double bonds of the vinyl ethers b) is in a molar ratio of 1.3:1 to 0.8:1.
摘要:
An aqueous coating material comprising A) at least one polyester that is water-soluble or water-dispersible, B) at least one polyurethane acrylate that is water-soluble or water-dispersible, C) at least one amino resin that is itself water-soluble or water-dispersible or is water-soluble or water-dispersible in the presence of the polyester and the polyurethane acrylate, D) at least one of a color pigment, an effect pigment, a color and effect pigment, and a filler, and E) optionally at least one polyisocyanate. Also, processes for preparing and using the aqueous coating material.
摘要:
The invention provides a composition for producing surface coatings combining improved hardness, scratch resistance and acid resistance with good reflow behavior, a process for preparing such a surface coating, and for the use of polyisocyanatoisocyanurates having a functionality of more than 3.5 and a viscosity at 23° C. of more than 3500 to produce surface coatings.
摘要:
The invention relates to a process for the preparation of multicoat finishes of the basecoat/clearcoat type in which transparent topcoats are employed which contain(A) as binder, an autocrosslinkable polyacrylate resin which contains on statistical average at least one epoxide group, at least one acid anhydride group and at least 0.2 tri-, di- or monoalkoxysilane group per molecule, or a mixture of such autocrosslinkable polyacrylate resins, and(B) at least one acid and/or at least one base as crosslinking catalyst.
摘要:
The invention relates to a process for the production of a multi-layered coating in which the aqueous top coating composition contains a water-dilutable polyacrylate resin which has a hydroxyl number of 40 to 200, an acid number of 20 to 100 and a glass transition temperature (T.sub.G) of -40.degree. C. to +60.degree. C. and can be prepared by adding a mixture (I) of a (meth)acrylic acid ester and a copolymerizable monomer containing hydroxyl groups to an organic solvent, subjecting the mixture to free radical polymerization and, when the addition of mixture (I) has ended, adding a monomer containing carboxyl groups and polymerizing the mixture further.
摘要:
A water-dilutable coating comprising a binder obtained from an epoxide resin-modified polyester possessing free carboxyl groups prepared from the reaction of:A) a polyester polymerized from:a.sub.1) a polycarboxylic acid containing at least three carboxyl groups and/ora.sub.2) a polyol containing at least one carboxyl group anda.sub.3) a polycarboxylic acid containing two carboxyl groups anda.sub.4) a polyol, wherein the polyester contains (cyclo)aliphatic elements having at least six carbon atoms;B) from 0.3-1.5 equivalents per polyester molecule of a bisphenol epoxide resin or a reaction product thereof containing at least one epoxide group per molecule with a carboxylic acid; andC) a crosslinking agent.
摘要:
A powder coating slurry, especially a powder clearcoat slurry, comprising at least one hydroxyl-containing binder A, at least one polyisocyanate crosslinking agent B, and water, where 1) the hydroxyl-containing binders A and the polyisocyanates B have been homogenized such that not less than 30, preferably not less than 60 and in particular not less than 90% by weight of the polyisocyanate B are present in solution or dispersion in the particles comprising the binders A, and 2) the particles of the crosslinking agent B which may still be present in the aqueous phase, and the particles comprising the binders A and the crosslinking agents B, have been stabilized, by way of the isocyanate groups present on their surface, by means of a deactivator added to the aqueous phase.