Non-chrome resin composition, method for processing steel plate surface and steel plate

Abstract

The invention provides a chromium-free resin constituent with excellent corrosion resistance, alkali resistance, processability, electroconductibility, and chemical resistance, a method for carrying out a surface treatment on a steel plate, and a steel plate manufactured according to the method. The surface treatment steel plate is prepared through coating the steel plate by the resin constitute; after the steel plate is dry, the quantity of resin mixture adhered to the steel plate is in the scope of 300 to 1800mg/m<2>, wherein, based on the overall solid content of the resin constituent, the resin constituent consists of: mixture of hard urethane resin and 10-90 weight percent of soft urethane resin; based on the overall solid content of the mixture, the mixture contains 5-95 weight percent of soft urethane resin and 5-95 weight percent of hard urethane resin; 1-20 weight percent of Ti or Zr and the like organic oxide; 0.1-10.0 weight percent of at least one of compounds selected from a group composed of aluminium phosphate, aluminium dihydrogen phosphate, phosphate monozinc and hydrated manganese phosphate; solvent.

Description

technical field [0001] The present invention relates to a chromium-free resin composition having good alkali resistance and processability and excellent corrosion resistance, conductivity and chemical resistance for surface treatment of steel plates, using the chromium-free resin composition A method of manufacturing a steel sheet, and a surface-treated steel sheet manufactured by the method. Background technique [0002] Recently, with increasing attention to environmental issues, controls on the use of environmental pollutants (such as Cr, Pb, Cd, Hg, PBB, PBDE, etc.) have been tightened all over the world. As representative examples of these controls, specifically, there are the Restriction of Hazardous Substances Directive (RoHS, implemented on July 1, 2006), the Waste Electrical and Electronic Equipment Directive (WEEE, implemented on July 1, 2006), the Registration, Evaluation and Authorization (REACH), End-of-Life Vehicle Directive (ELV, implemented on January 1, 200...

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Problems solved by technology

[0006] However, this product has a problem in that it is not suitable for suppressing electromagnetic waves and internal noise from copiers, printers, VCRs, computers, etc., and often deteriorates depending on the thickness of the metal salt or film due to the conductivity and soldering performance of the metal plate , so this product is not suitable for ensuring the workability of sheet metal

However, the problem is that the complex of organic resin and inorganic binder should be prepared in advance

In addition, some products that necessarily require alkali resistance have a problem that when the resin layer is in contact with an alkali solution, the resin layer is damaged due to lack of alkali resistance, which results in loss of the resin layer or severe discoloration of the surface of the product

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