摘要:
The invention relates to a method for the production and repair of multicoat special-effect coatings, in which the basecoats is produced exclusively by elecrostatic �sic! spraying, a coating material with a specific rheological behavior is employed as the basecoats and the repair is carried out with the aid of a spray application process in which a spray jet is produced which is distinguished in that at most 40% of the coating droplets passing a measurement point which lies at the center of the spray jet and 300 mm away from the nozzle have a diameter which is less than 20 .mu.m and at least 5% of the coating droplets have a diameter which is greater than 60 .mu.m, at least 20% of the coating droplets passing the measurement point have a speed which is less than 6 m/s and at most 30% of the coating droplets have a speed of more than 10 m/s, and the coating droplets have a momentum which is equal to at least 4.times.10.sup.-5 g cm s.sup.-1, the diameter and the speed having been determined with the aid of the Doppler phase anemometry method.
摘要翻译:本发明涉及一种生产和修理多功能特殊效果涂料的方法,其中底漆是通过静电喷涂生产的,采用具有特定流变行为的涂料作为底漆,并进行修复 借助于其中产生喷射射流的喷雾施加过程,其特征在于通过位于喷射射流中心并距离喷嘴300mm的测量点的至多40%的涂层液滴具有 小于20μm的直径和至少5%的涂布液滴具有大于60μm的直径,通过测量点的至少20%的涂布液滴具有小于6μm的速度 / s,并且最多30%的涂布液滴具有大于10m / s的速度,并且涂布液滴具有等于至少4×10 -5 g cm s -1的动量,其直径和速度具有 已经确定与援助o f多普勒相电流法。
摘要:
The present invention relates to a process for the production of sealed packaging containers of plastics films, using a sealing coating based on an aqueous dispersion or solution of acrylate copolymer, where the aqueous dispersion of acrylate copolymer is prepared by emulsion polymerization offrom 1 to 15% by weight of .alpha.,.beta.-ethylenically unsaturated carboxylic acids, from 40 to 69% by weight of alkyl esters of acrylic acid having 1-12 carbon atoms in the alkyl radical, from 0 to 55% by weight of alkyl esters of methacrylic acid having 1-12 carbon atoms in the alkyl radical and/or vinylaromatics, and from 0 to 25% by weight of further monomers, the sum of the monomers in each case being 100% by weight. The glass transition temperature being not more than 50.degree. C. and the number-average molecular weight of the acrylate copolymer being 8000-12,000; in the first stage from 5 to 20% by weight of the monomer mixture are polymerized and preferably after renewed addition of emulsifier in the second stage the residual monomer mixture is polymerized in the presence of the polymer obtained in the first stage, the resulting reaction mixture is at least partially neutralized, conventional auxiliaries and additives are added if desired, and the resulting sealing coating is applied to the plastics film and dried.
摘要:
The present invention relates to a process for the production of textured coatings on plastics surfaces using coating compositions based on hydroxyl group-containing binders and polyisocyanates, and using pulverulent texturing agents. The process is characterized in that, initially, a solution of the hydroxyl group-containing binder (I) is mixed with an elastic matting paste (A) comprising a1) from 12 to 25% by weight of a saturated hydroxyl group-containing polyester having a hydroxyl number of from 100 to 160 mg of KOH/g and a number-average molecular weight of from 800 to 2500, a2) from 1 to 4% by weight of a hydroxyl group-containing Cardura-modified acrylate copolymer having a hydroxyl number of from 30 to 250 mg of KOH/g and an acid number of from 0 to 50 mg of KOH/g, a3) from 0 to 3% by weight of cellulose ester, a4) from 35 to 60% by weight of organic solvent, a5) from 12 to 25% by weight of matting agents and if desired catalysts, wetting agents and, if desired, other auxiliaries and additives, the total weight of the elastic matting paste (A) being in each case 100% by weight, the elastic matting paste (A) being sieved if desired before or after being mixed with the solution of the hydroxyl group-containing binder (I), the mixture is subsequently mixed together with polyisocyanates (II) as crosslinking agents, other organic solvents if desired and with the pulverulent texturing agent, the resulting coating composition is applied to the plastics substrate, and the coating is dried.
摘要:
Disclosed is a filler paste comprising polyurethane resin, chlorinated polyolefin, filler and/or extender, and organic solvents. The filler paste may also include physically drying binders, pigments, and/or rheological additives. Also disclosed is a basecoat containing the filler paste. The basecoat containing the filler paste may be applied directly to polyolefin substrates. After a flash-off period, a basecoat that does not contain the filler paste may be applied on top of the first basecoat layer. After a flash-off period for the second basecoat layer, a clearcoat may be applied and subsequently the applied layers may be cured together, with heating.
摘要:
A coating agent comprises a binding agent containing at least one acrylate copolymer (A) with carboxyl groups and/or at least one acrylate copolymer (B) with epoxide groups, the acrylate copolymers (A) and (B) being obtained by solution polymerization using less than 5% by weight based on the total weight of monomers of one or more polysiloxane macromonomers a.sub.1 having a number-average molecular weight of 1000 to 40,000 and on average 0.5 to 2.5 ethylenically unsaturated double bonds per molecule; one or more addition and/or condensation resins with carboxyl groups; and one or more epoxy resins.
摘要:
The present invention relates to a powder coating, in particular for internal coating of packaging containers, which is characterized in that it1.) comprises at least one epoxy resin having an epoxide equivalent weight of from 300 to 5500 and at least one hardener having more than one phenolic hydroxyl group per molecule and a hydroxyl equivalent weight, based on the phenolic OH groups, of from 100 to 500, and2.) has a particle size distribution such that at least 90 percent by weight of the powder coating particles have a particle size of between 1 and 60 .mu.m, the maximum particle size of the powder coating particles is .ltoreq.100 .mu.m, the mean particle size of the powder coating particles is between 5 and 20 .mu.m and the gradient of the particle distribution curve at the point of inflexion is .gtoreq.100.
摘要:
The invention relates to a process for the production of a multicoat coating in which the aqueous topcoat composition contains a water-thinnable polyacrylate resin which has a hydroxyl value of 40 to 200, an acid value 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, a copolymerizable hydroxyl-containing monomer and, if appropriate, a further ethylenically unsaturated monomer to an organic solvent and carrying out free-radical polymerization and adding, at the end of the addition of the mixture (I), a mixture of a monomer containing carboxyl groups and a monomer free from carboxyl groups and continuing the polymerization.
摘要:
The present invention relates to an acrylate copolymer containing amino groups, carboxyl groups and, if appropriate, hydroxyl groups which is characterized in that it has been produced by preparing an acrylate copolymer containing amino groups and, if appropriate, carboxyl groups, by means ofA) free-radical solution polymerization, using azo initiators at temperatures from 80.degree. to 150.degree. C., ofa.sub.1) 1 to 20% by weight of vinylimidazole and/or dimethylaminopropylmethacrylamide,a.sub.2) 0 to 50% by weight of one or more monomers containing hydroxyl groups,a.sub.3) 0 to 50% by weight of one or more monomers containing carboxyl groups, anda.sub.4) 30 to 85% by weight of at least one further ethylenically unsaturated copolymerizable monomer,the total of the proportions by weight of the components a.sub.1 to a.sub.4 always being 100% by weight, and the proportions by weight of the components a.sub.2 and a.sub.3 not both simultaneously being zero, andB) if appropriate, reacting the acrylate copolymer obtained in stage (A) with carboxylic acid anhydrides, the quantity of carboxylic acid anhydrides employed having been selected such that the resulting copolymer has the desired acid number.
摘要:
A radiation-crosslinkable mixture which contains a carboxyl-containing precursor of a heterocyclic polymer, a copolymerizable ethylenically unsaturated ternary sulfonium salt, a photoinitiator and a polar aprotic organic solvent.
摘要:
The invention relates to a cathodic electro-dipping process wherein the electro-dipping primer employed contains a crosslinking agent which can be obtained by reactinga) a diol and/or a triol or a mixture of diols and/or a mixture of triols,b) diphenylmethane 4,4'-diisocyanate the melting point of which has been depressed, by partial reaction with a monool and/or polyol or a mixture of monools and/or a mixture of polyols, so far that it is liquid at room temperature andc) a masking agent or a mixture of masking agentsto give a crosslinking agent which is free from isocyanate groups.