摘要:
The invention relates to a method for removing a substrate that is coated with an organic coated coating by means of ionogenic gel formation. In said method, a wet or dry organic coating that has not yet formed a film on the substrate is treated with an aqueous solution of a metal salt from main group I in the periodic table of the elements, a complexing agent and/or a basic compound having a pH value >10.
摘要:
The invention relates to a method for coating surfaces, to a corresponding coating, and to the use of the objects coated in accordance with said method. The invention relates to a method for coating metal surfaces of substrates, comprising or consisting of the following steps: I. providing a substrate having a cleaned metal surface, II. contacting and coating metal surfaces with an aqueous composition in the form of a dispersion and/or suspension, IX. optionally rinsing the organic coating, and X. drying and/or baking the organic coating or XI. optionally drying the organic coating and coating with a coating composition of the same type or a further coating composition before a drying process and/or baking process, wherein in step II the coating is performed with an aqueous composition in the form of a dispersion and/or suspension containing 2.5 to 45 wt% of at least one non-ionic stabilized binder and 0.1 to 2.0 wt% of a gelling agent, wherein the aqueous composition has a pH value in the range of 0.5 to 7 and forms, with the cations eluted from the metal surface in the pretreatment step and/or during the contacting in step II, a coating based on an ionogenic gel.
摘要:
The invention relates to a method for coating surfaces, to a corresponding coating, and to the use of the objects coated according to said method. According to the invention, the method has or consists of the following steps: I. providing a substrate with a cleaned surface, II. contacting and coating the surfaces with an aqueous composition in the form of a dispersion and/or suspension, VI. if necessary rinsing the organic coating, and VII. drying and/or baking the organic coating or VIII. if necessary drying the organic coating and carrying out a coating process using a similar or additional coating composition prior to a drying and/or baking process, wherein between step I and step II, the coating process is carried out using an aqueous composition in the form of a dispersion and/or suspension on the basis of a colloidal silicate sol, which incorporates multivalent metal cations, or a silane- or silicate-modified polymer and if necessary a rinsing process is carried out.
摘要:
The invention relates to a method for coating surfaces, a corresponding coating and the use of objects coated according to said method. According to the invention, the problem is addressed by a method for coating metallic surfaces of substrates comprising or consisting of the steps: I. Providing a substrate with a cleaned, metallic surface, II. Contacting and coating metallic surfaces with an aqueous composition in the form of a dispersion and/or suspension, IX. If applicable, rinsing the organic coating and X. Drying and/or baking the organic coating or XI. If applicable, drying the organic coating and coating with an equivalent or additional coating composition prior to a drying and/or baking, characterised in that, in step II, the coating takes place with an aqueous composition in the form of a dispersion and/or suspension, wherein at least one anionic polyelectrolyte, in a quantity of 0.01 to 5.0 wt.% relative to the total mass of the resulting mixture, is added to a dispersion of film-forming polymers and/or a suspension of film-forming inorganic particles having a solids content of 2 to 40 wt.% and an average particle size from 10 to 1000 nm, wherein the aqueous composition has a pH value in the range of 4 to 11 and forms a coating on the basis of an ionogenic gel which binds cations released from the metallic surface and said cations originate from a pretreatment stage and/or from the contacting in step II.
摘要:
The invention relates to a method for the currentless coating of substrates, comprising the steps of: I. providing a substrate, II. Optionally cleaning the substrate, III. applying an activation layer consisting of polyelectrolyte and/or salt with a first aqueous composition (= activation agent), IV. optionally intermediately drying the activation layer, V. rinsing the activation layer, wherein the activation layer is not removed completely, VI. contacting and coating the activated surfaces remaining after the rinsing with an aqueous composition in the form of a solution, emulsion and/or suspension to form an organic subsequent layer (= precipitation layer), VII. optionally rinsing the subsequent layer, and VIII. drying, wherein the activation layer is formed with an aqueous activation agent in the form of a solution, emulsion and/or suspension, which contains at least one cationic polyelectrolyte and/or at least one cationically active salt dissolved in water, wherein the aqueous composition for forming the subsequent layer has components which can be precipitated, condensed and/or salted out, are stabilised anionically, zwitterionically, sterically and/or cationically, and do not affect anionically and cationically stabilised components, and wherein the dry film formed thereby and consisting of the activation layer and the subsequent layer has a thickness of at least 1 µm.