摘要:
A pseudoplastic powder clearcoat slurry which is free from organic solvents and comprises solid and/or highly viscous, particles which are dimensionally stable under storage and application conditions and have an average size of from 0.8 to 20 μm, at least 99% of the particles having a size ≦30 μm, which is preparable by 1) emulsifying an organic solution comprising binder and crosslinking agent to give an emulsion of the oil-in-water type, 2) removing the organic solvent or solvents, and 3) wet grinding the resulting slurry; and also the use of the powder clearcoat slurry to produce clearcoats for automotive OEM finishing and automotive refinish, for furniture coating and for industrial coating, including coil coating, container coating and the coating of electrical components.
摘要:
Disclosed herein are pseudoplastic aqueous dispersions having solid and/or high-viscosity particles (A), dimensionally stable under storage and application conditions, in dispersion in a continuous aqueous phase (B), the dispersion having at least one solid polyurethanepolyol (C) containing cycloaliphatic structural units having a glass transition temperature >15 ° C., processes for preparing them, and their use.
摘要:
Disclosed herein is a polyol (A) based on modified amino resins, prepared by reacting: an amino resin (B) comprising three acetalized or etherified N-methylol groups of the general formula (I)>N—CHR—OR1, wherein R is a hydrogen atom, an alkyl group of 1 to 6 carbon atoms or an aryl group of 6 to 10 carbon atoms and R1 is an alkyl group of 1 to 6 carbon atoms; with a polyol (C) of the general formula (II) R2(—OH)n, wherein n is a number from 2 to 6 and R2 is a divalent to hexavalent organic radical; wherein an equivalent ratio of the acetalized or etherified N-methylol groups to the polyol (C) is 0.5:1 to 1.2:1; with elimination of at least 50 mol % of a monoalcohol (D) of the general formula R1—OH, wherein R1 is as defined above, from the amino resin (B).
摘要:
Disclosed herein is a polyol (A) based on modified amino resins, prepared by reacting: an amino resin (B) comprising three acetalized or etherified N-methylol groups of the general formula (I) >N—CHR—OR1, wherein R is a hydrogen atom, an alkyl group of 1 to 6 carbon atoms or an aryl group of 6 to 10 carbon atoms and R1 is an alkyl group of 1 to 6 carbon atoms; with a polyol (C) of the general formula (II) R2(—OH)n, wherein n is a number from 2 to 6 and R2 is a divalent to hexavalent organic radical; wherein an equivalent ratio of the acetalized or etherified N-methylol groups to the polyol (C) is 0.5:1 to 1.2:1; with elimination of at least 50 mol % of a monoalcohol (D) of the general formula R1—OH, wherein R1 is as defined above, from the amino resin (B).
摘要:
Reactive compositions which consist of or comprise (A) at least one polyisocyanate whose isocyanate groups have been partly or fully blocked with propargyl alcohol, (B) at least one constituent which contains on average at least two isocyanate-reactive functional groups in the molecule, and (C) at least one catalyst which catalyzes the addition reaction of the isocyanate-reactive functional groups of (B) with the acetylenically unsaturated triple bond of the propargyl groups, and their use as coating materials, adhesives, and sealing compounds.
摘要:
The invention relates to a polyether urethane of the general formula ##STR1## wherein R.sup.1 denotes H or an alkyd (sic) radical of 1 to 8 carbon atoms,R.sup.2 denotes an alkylene radical of 2 to 10 carbon atoms or a cycloalkylene radical of 6 to 20 carbon atoms or an arylene radical of 6 to 20 carbon atoms,R.sup.3, R.sup.4 denote an optionally substituted alkyl radical of 1 to 8 carbon atoms or a joint ring whose members are R.sup.3 and R.sup.4,n denotes 2 to 1800m denotes 1 to 15.The invention further relates to a process for its preparation, to a flow-out agent for water-borne paints and to the use of the polyether urethanes as flow-out agents in water-borne, cathodically depositable electro-coating paints.
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.
摘要:
The invention relates to a cathodic electro-dipcoating process, wherein the electro-dipcoating composition used contains a cationic, amine-modified epoxy resin, which is obtainable by reacting(A) a polyepoxide,(B) an amine and(C) an adduct, which is obtainable by . . . (sic)(c1) a polyether- or polyester-polyol,(c2) a polyisocyanate and(c3) a compound which contains at least one hydrogen atom which is reactive towards isocyanate groups and at least one ketimine group in the molecule, and/or(D) a hydrolysis product of (C)with one another in a relative proportion such that 20 to 90% of the epoxy groups of component (A) are reacted with component (B) and the remaining epoxy groups are reacted with component (C) and/or (D), and--if still necessary--at least partially protonating the reaction product thus obtained.
摘要:
The invention relates to a process for the preparation of aqueous dispersions to be further processed to electrocoating paints with baking temperatures below 160.degree. C. and baking times.ltoreq.30 minutes, which dispersions contain modified epoxide-amine adducts as binders and polyisocyanates blocked by hydroxyl groups as cross-linking agents.In this process polyepoxides and compounds containing one or more, preferably 2, hydroxyl groups per molecule are reacted at elevated temperatures in the presence of catalysts to furnish epoxide-containing intermediates.A solvent or a mixture of solvents is then added with external cooling ahd the solution is boiled under reflux, if necessary in vacuo, until the temperature of the solution drops to 95.degree. C. to 20.degree. C.Amines are then added onto the epoxide groups which are still present in a free state in the epoxy resin and a dispersion is prepared by adding a water/acid mixture after adding the crosslinking agent or the dispersion is first prepared and the crosslinking agent is added subsequently.
摘要:
The invention relates to a process for coating an electrically conductive substrate, the said substrate being immersed in an aqueous bath based on a cationic synthetic resin binder which is at least in part neutralized with acids and contains amino and/or hydroxyl groups. The said bath contains a mixture of crosslinking agents as well as pigments, fillers, corrosion inhibitors, paint auxiliary substances, and, if appropriate, catalysts, as well as organic solvents in an amount of up to 15% by weight based on the total weight of the coating, the said substrate being cathodically connected. By the action of direct current, a film is deposited on the substrate, after which the said substrate is removed from the bath and the film is cured by stoving, the mixture of crosslinking agents comprising at least two crosslinking agents of different reactivities based on activated esters and/or polyisocyanates blocked by different blocking agents. The expression "different reactivities" means that the crosslinking reaction commences by heating to temperatures which are separated by at least 10.degree. C. and that crosslinking agent which is first to react is present in an amount of 15 to 60 mol %, based on the mixture of the crosslinking agents. This first coat is rinsed and one or more further cathodic coats are deposited before stoving. After each coat has been rinsed, all the coats are cured together.