Antifouling coating for sanitary hardware products and preparation method thereof

Abstract

The application discloses a kind of kitchen and bathroom hardware product scale prevention coating and preparation method thereof, preparation method includes: step one, metal workpiece is treated before plating, then carries out copper layer electroplating;Step two, carries out nickel layer electroplating;Step three, porous trivalent chromium layer is electroplated, and the porous chromium layer is formed by trivalent chromium electroplating solution electroplating;Step four, vacuum impregnation hydrophobic coating, the workpiece of above-mentioned plating porous chromium layer is placed in impregnation liquid, after impregnation in vacuum oven, clean;Step five, low-temperature solidification.The application can control the size and pore density of trivalent chromium coating nanopore by pore forming agent concentration, current density, electroplating time;And directly form porous structure while electroplating chromium in one step, without increasing process, and without changing the appearance of trivalent chromium coating.The application uses vacuum impregnation method and is suitable for mass production;The coating prepared by the application is commonly used in kitchen and bathroom hardware products, and the coating has the functions of reducing scale generation, preventing scale adhesion, easy cleaning of scale, etc.

Claims

1. A method for preparing an anti-scaling coating for kitchen and bathroom hardware products, comprising the following steps: Step 1: The metal workpiece undergoes pre-plating treatment before being electroplated with a copper layer. Step two: Electroplating a nickel layer; Step 3: Electroplating a porous trivalent chromium layer. The trivalent chromium plating solution consists of: 25±5 g / L trivalent chromium salt, 50±10 g / L carboxylate as a complexing agent, 55±5 g / L boric acid as a pH buffer, 250±20 g / L inorganic conductive salt, 10±2 g / L bromide as an inhibitor, 0.1±0.05 g / L trivalent chromium additive, and 0.025-0.1 g / L pore-forming agent. The electroplating process conditions are: graphite plate as anode, workpiece to be plated as cathode, and current density of 8-15 A / dm³. 2 The electroplating time is 1-5 min, and the reaction temperature is 50-60 ℃; the pore-forming agent is an organic compound containing quaternary ammonium cations and halide ions; Step four: Vacuum impregnation of the hydrophobic coating. The workpiece with the porous trivalent chromium layer is placed in the impregnation solution, immersed in a vacuum oven, and then cleaned. The impregnation solution includes: 10-30 wt% inorganic nanoparticles, 40-60 wt% low surface energy polymer and 20-40 wt% ethanol solution; vacuum oven temperature 40-70℃, 0.001-0.02 MPa; Step 5: Low-temperature curing.

2. The method for preparing an anti-scaling coating for kitchen and bathroom hardware products according to claim 1, characterized in that: In step three, the thickness of the porous trivalent chromium layer is 200-300 nm, and the pore size is 50-100 nm.

3. The method for preparing an anti-scaling coating for kitchen and bathroom hardware products according to claim 1, characterized in that: The trivalent chromium salt includes at least one of chromium sulfate, chromium chloride, and chromium formate; the ligand includes at least one of formic acid and its salts, acetic acid and its salts, oxalic acid and its salts, and tartaric acid and its salts; the conductive salt includes at least one of sodium chloride, potassium chloride, ammonium chloride, potassium sulfate, and ammonium sulfate; the inhibitor includes at least one of potassium bromide and ammonium bromide. The trivalent chromium additives include at least one of alkyl sulfates, sulfonates, and ether compounds.

4. The method for preparing an anti-scaling coating for kitchen and bathroom hardware products according to claim 1, characterized in that: In step three, the trivalent chromium pore-forming agent is one or more of diethylcarbosine azodimethylaniline, diethylcarbosine azodimethylphenol, carbosine azophenol, and basic lake blue.

5. The method for preparing an anti-scaling coating for kitchen and bathroom hardware products according to claim 1, characterized in that: In step four, the inorganic nanoparticles are one or more of SiO2, Al2O3, MoS2, and TiO2, with a size of 20-50 nm.

6. The method for preparing an anti-scaling coating for kitchen and bathroom hardware products according to claim 1, characterized in that: In step four, the low surface energy polymer is selected from one of polyvinylidene fluoride (PVDF), polytetrafluoroethylene (PTFE), and polydimethylsiloxane (PDMS).

7. The method for preparing an anti-scaling coating for kitchen and bathroom hardware products according to claim 1, characterized in that: The low-temperature curing step five involves maintaining the temperature at 80-100℃ for 30-60 minutes.

8. The anti-scaling coating prepared by the preparation method according to any one of claims 1 to 7.

9. A kitchen and bathroom hardware product, characterized in that, It has the anti-scaling coating as described in claim 8.

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