Composition for surface treatment of mg-containing galvanized steel sheet and mg-containing galvanized steel sheet surface-treated using same
A galvanized steel sheet and surface treatment technology, applied to the device for coating liquid on the surface, the pretreatment surface, the plating of superimposed layers, etc., can solve the problems of insufficient chemical resistance, yellowing, blackening, etc., to prevent Effects of blackening and/or dark spots, corrosion resistance prevention of processed parts, and permeability reduction
Active Publication Date: 2021-04-09
浦项股份有限公司
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Problems solved by technology
However, the coating is composed of only non-crosslinked polyvinylidene-based polymers, and thus has high moisture and oxygen permeability compared to coatings composed of cross-linked polyvinylidene-based polymers, thereby Blackening and black spots occur, and there is a disadvantage that an organic solvent is inevitably required in order to make a polyvinylidene-based polymer into a fluid coating solution
[0006] The patents related to polyvinylidene resins containing carboxyl groups include U.S. Patent No. 6037124 (Carboxylated polyvinylidene fluoridesolid supports for the immobilization of biomolecules and methods) of useethereof)), U.S. Laid-Open Patent No. 2013-0231428 (FAST FILMFORMATION WATER BASED BARRIER COATING), etc., but there is no improvement in the corrosion resistance of the processed part of the plated steel sheet containing Mg , application of anti-blackening and cross-linking patents
[0007] In the past, in order to prevent the penetration of moisture and oxygen, polyvinylidene-based polymers were dissolved in organic solvents and coated on steel sheets containing Mg, but environmental pollution problems occurred due to the use of organic solvents, and polyvinylidene-based polymers No cross-linking occurs between them, so the chemical resistance is insufficient, and there is a limitation in reducing the permeability of moisture and oxygen
[0008] In addition, in order to synthesize a polyvinylidene polymer (copolymer) by emulsion (co)polymerization, an emulsifier is used, but the polyvinylidene polymer (copolymer) dispersion material synthesized as described above is coated on a plated steel sheet When forming a film on the film, due to the emulsifier containing low molecular weight salt, it is easy to be affected by moisture, and when it is exposed to high temperature and high humidity environment for a long time, there is a problem of causing yellowing (ref.Emulsion Polymerization and Emulsion Polymers, by PeterA.Lovell (Editor), Mohamed S. El-Aasser (Editor), March 1997)
Method used
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Embodiment 1
[0071] (1) Preparation of carboxylated vinylidene emulsion copolymer (carboxylated vinylidene emulsioncopolymer)
[0072] 10 g of vinylidene fluoride and 0.1 g of acrylic acid were added to 89.87 g of distilled water, and the temperature was raised to about 30° C., while stirring at a speed of 200 rpm with a stirrer, 0.02 g of potassium peroxysulfate (potassiumperoxysulfate) and 0.01 g of sodium bisulfite (sodium bisulfite), and carry out emulsion copolymerization for about 5 hours, thereby preparing a carboxylated vinylidene fluoride emulsion copolymer dispersion with a conversion rate of 99.5% or more.
[0073] At this time, the particle size of the prepared polymer is 0.1-0.5 μm.
[0074] (2) Preparation of a composition for surface treatment of a plated steel sheet containing Mg
[0075] At room temperature, 0.05 g of aziridine crosslinking agent (trade name: CX-100, DSM Corporation), 15 g of chromium phosphate (solid content: 100%) as a trivalent chromium compound, and ...
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Abstract
The present invention relates to a composition for surface treatment of an Mg-containing galvanized steel sheet comprising a trivalent chromium compound, a carboxylated vinylidene copolymer, and a cross-linking agent. The composition for surface treatment according to the present invention forms a chromium(III) film and is also cross-linked in coating and drying of the surface of a galvanized steel sheet, thereby forming a three-dimensional compact molecular structure. Thus, a galvanized steel sheet coated with the composition has a coating film with high ductility, and can reduce moisture and / or oxygen permeability such that, not only does a worked section have excellent corrosion resistance, but also the occurrence of darkening and / or black dots can be prevented even when exposed to high-temperature and high-humidity environment for a long period of time.
Description
technical field [0001] The present invention relates to a composition for surface treatment of a galvanized steel sheet containing Mg and a galvanized steel sheet containing Mg surface-treated by using the composition, and more particularly relates to a method for preventing the processing of a galvanized steel sheet containing Mg. A composition for surface treatment that partially produces white rust and blackening, and a galvanized steel sheet containing Mg that is surface-treated with the composition. Background technique [0002] Compared with the existing galvanized steel sheets, the galvanized steel sheets containing Mg have the advantages of high production speed, high corrosion resistance, and excellent economical efficiency, but the activity of Mg is very high, so it may be damaged in a humid atmosphere. A blackening phenomenon occurs in which the surface of the product reacts with moisture and turns black. [0003] As a technology for improving the corrosion resis...
Claims
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IPC IPC(8): C09D5/10C09D127/08C09D127/16C23C2/06B05D7/14B05D7/24B05D3/02
CPCB05D7/14B05D7/24C09D127/16C23C2/26C23C28/322C23C28/34B05D2350/65B05D2401/20C08K2003/321C08F214/205C09D5/08C08K3/32C08K5/3412C08K13/02C08F220/06C09D5/10C09D127/08C23C2/06B05D3/0254C08F2/22C08F214/225C23C30/005C23C2222/10C25D3/56C25D5/48C09K15/326
Inventor 朴永俊金龙云
Owner 浦项股份有限公司