摘要:
The invention provides coating compositions comprising at least one compound (A) containing hydroxyl groups, at least one compound (B) containing isocyanate groups, at least 5.0% by weight, based on the nonvolatile constituents of the coating composition, of at least one amino resin (C), wherein the coating composition comprises at least one unsaturated, cyclic, sterically hindered amine (D) and the coating composition contains less than 2.5 mol % of hydrolyzable silane groups, based on the sum of hydroxyl groups, isocyanate groups, and hydrolyzable silane groups. The invention additionally relates to multistage coating processes using these coating compositions and also to the use of the coating compositions as clearcoat material and to the use of the coating process for automotive OEM finishing and automotive refinish.
摘要:
The present invention relates to a transparent powder coating material comprising a) at least one epoxy-containing binder with a content of from 20 to 45% by weight, preferably from 25 to 40% by weight of glycidyl-containing monomers and with or without a content of vinylaromatic compounds, preferably styrene, b) tris(alkoxycarbonylamino)triazine and polycarboxylic acids, preferably straight-chain aliphatic dicarboxylic acids and/or carboxy-functional polyesters, as crosslinking agents, and c) if desired, catalysts, auxiliaries, additives typical for transparent powder coating materials, such as degassing agents, levelling agents, UV absorbers, free-radical scavengers, antioxidants.
摘要:
Disclosed is an aqueous dispersion of a transparent powder coating consisting of a solid powder component and an aqueous component. The solid powder component includes at least one epoxy group-containing binder, at least one crosslinking agent, and optionally catalysts, adjuvants, or additives typical for transparent powder coatings. The binder contains 30-45% glycidyl-containing monomers and optionally vinylaromatic compounds such as styrene. The crosslinking agent is preferably a straight-chain aliphatic dicarboxylic acid and/or a carboxy-functional polyester. The aqueous component includes at least one nonionic thickener and optional materials such as catalysts, adjuvants, and/or other such materials. The nonionic thickener is preferably a nonionic associative thickener. The invention also provides a process for preparing the aqueous dispersion of the invention and a process for coating a vehicle body with the aqueous dispersion of the invention.
摘要:
A pseudoplastic clearcoat slurry comprising solid and/or highly viscous particles which are dimensionally stable under storage and application conditions and at least one wetting agent selected from the group consisting of alkoxylated fatty alcohols having from 16 to 18 carbon atoms in the alkyl radical and containing on average per molecule at least 20 oxaalkanediyl groups; process for preparing it, and its use.
摘要:
The present invention relates to a process for producing single-coat or multicoat clearcoat finishes on primed or unprimed substrates by applying at least one powder coating dispersion, in particular a powder clearcoat slurry, to the substrate and then curing the resulting film(s) thermally and/or with actinic radiation, in which oxalic acid is added to at least one powder coating dispersion, in particular to a powder clearcoat slurry.
摘要:
A pseudoplastic powder clearcoat slurry which is free from organic solvents and external emulsifiers and comprises solid spherical particles with an average size of from 0.8 to 20 &mgr;m and a maximum size of 30 &mgr;m, at least one ionic thickener and at least one nonionic associative thickener, the powder clearcoat slurry having an ion-forming group content of from 0.05 to 1 meq/g, a neutralizing agent content of from 0.05 to 1 meq/g, and a viscosity of (i) from 50 to 1 500 mPas at a shear rate of 1 000 s−1, (ii) from 150 to 8 000 mPas at a shear rate of 10 s−1, and (iii) from 180 to 12 000 mPas at a shear rate of 1 s−1.
摘要翻译:一种不含有机溶剂和外部乳化剂的假塑性粉末清漆浆料,其包含平均尺寸为0.8至20μm,最大尺寸为30μm,至少一种离子增稠剂和至少一种非离子缔合增稠剂的固体球形颗粒, 离子形成基团含量为0.05〜1meq / g,中和剂含量为0.05〜1meq / g,粘度为(i)为50〜1500mPa·s的粉末透明涂料浆料为剪切速率 1 000 s -1,(ii)剪切速率为10 s -1的150至8 000 mPas,(iii)180 s至1 000 mPas,剪切速率为1 s -1 >。
摘要:
Novel powder clearcoat materials and novel powder clearcoat slurries comprising a) at least one epoxide-containing binder containing from 0.5 to 40% by weight, based on the binder, of copolymerized glycidyl-containing monomers, and b) at least one tris(alkoxy-carbonylamino)triazine and at least one polycarboxylic acid, in particular a straight-chain dicarboxylic acid, and/or a carboxy-functional polyester as crosslinking agent, or alternatively a) at least one tris(alkoxy-carbonylamino)triazine and at least one oligomeric or polymeric, epoxide-containing crosslinking agent containing from 0.5 to 40% by weight, based on the crosslinking agent, of copolymerized glycidyl-containing monomers, and/or a low molecular mass, epoxide-containing crosslinking agent, and b) at least one carboxyl-containing polymer as binder, both variants comprising c) at least one polyol.
摘要:
The present invention relates to an aqueous powder clearcoat dispersion comprising a solid pulverulent component A and an aqueous component B, where component A is a transparent powder coating material comprising a) at least one epoxy binder containing from 25 to 45% by weight, preferably from 25 to 35% by weight, of glycidyl-containing monomers, with or without a fraction of vinylaromatic compounds, preferably styrene, b) at least one crosslinking agent, preferably straight-chain, aliphatic dicarboxylic acids and/or carboxy-functional polyesters, and c) if desired, catalysts, auxiliaries, additives typical for transparent powder coating materials, such as devolatilizers, leveling agents, UV absorbers, free-radical scavengers, and antioxidants, and component B is an aqueous dispersion comprising a) at least one nonionic thickener and b) if desired, catalysts, auxiliaries, defoamers, wetting agents, antioxidants, UV absorbers, free-radical scavengers, biocides, small amounts of solvent, leveling agents, neutralizing agents, preferably amines, and/or water retention agents, and c) a dispersant medium in the form of a nonionic polyurethane dispersion.
摘要:
The present invention relates to an aqueous powder coating dispersion comprising a solid, pulverulent component A and an aqueous component B, in which component A. is a powder coating comprisinga) at least one epoxide-containing binder with a content of from 30 to 45%, preferably from 30 to 35%, of glycidyl-containing monomers and, if desired, with a content of aromatic vinyl compounds, preferably styrene,b) at least one crosslinking agent, preferably straight-chain aliphatic dicarboxylic acids and/or carboxy-functional polyesters, andc) if desired, catalysts, auxiliaries, typical powder coating additives, such as degassing agents, levelling agents, UV absorbers, free-radical scavengers and antioxidants,and component B. is an aqueous dispersion comprisinga) at least one nonionic thickener andb) if desired, catalysts, auxiliaries, defoaming agents, dispersion auxiliaries, wetting agents, preferably carboxy-functional dispersants, antioxidants, UV absorbers, free-radical scavengers, biocides, small quantities of solvent and/or hygroscopic agents.
摘要:
A description is given of a process for preparing a multilayer coating on a substrate surface, in which(A) an aqueous coating composition (ii) containing as film-forming agent an aqueous polymer dispersion is applied as basecoat (II) to a substrate surface coated with an aqueous basecoat (i),(B) the composition applied in step (A) is subjected to partial drying,(C) an appropriate transparent topcoat composition is applied to the basecoat (II) thus obtained, and(D) the basecoats (I) and (II) are baked together with the topcoat,wherein the basecoat composition (II) contains an aqueous polymer dispersion comprising(x) an acrylate polymer based on from 30 to 60% by weight of C.sub.1 -C.sub.8 -alkyl (meth)acrylate monomers, from 30 to 60% by weight of vinyl-aromatic monomers and from 0.5 to 10% by weight of (meth)acrylic acid, and(y) a thickener, which does not have an associative effect, containing an acrylate copolymer based on (C.sub.1 -C.sub.6)-alkyl (meth)acrylate and (meth)acrylic acid.