What are the conditions for organic dye dyeing and good dyeing?

Organic dyesDyeing is to immerse the anodized parts in organic dyes In the solution, the dye penetrates into the pores of the membrane layer and is adsorbed by the membrane layer to achieve the purpose of dyeing.

Because the adsorbed dye is not strong enough. Therefore, the color of the film is easily wiped off and the wear resistance is poor. In addition, organic dyes are easy to fade under long-term exposure to sunlight, so they have poor light resistance, but dyes containing aluminum, Good light resistance. But becauseorganic dyesvariety , and the color is bright, so it can be dyed in a variety of beautiful colors to meet the requirements of users. It can be seen that organic dye dyeing is widely used in interior decoration.

Best suitable forDye dyeingis a sulfuric acid anodized film, which is colorless and transparent, has high porosity, strong adsorption, and is easy to dye. The oxalic acid anodized film is yellow and can only produce darker colors. Chromic acid anodized coatings are also yellowish and have low porosity making them difficult to dye.

In order to achieve good dyeing effect, the anodized film layer should have The following conditions:

1. The film layer should be of sufficient thickness. The specific thickness depends on the color tone to be dyed. The darker the tone, the thicker the film layer. The thicker, usually the film thickness is 5~6μm when dyeing light colors, 8~10vm when dyeing dark colors, and more than 10μm when dyeing black films.

2. The membrane layer should have sufficient porosity and adsorption capacity.

3. The color of the film itself should be suitable for dyeing and the color should be uniform. For example, the anodized film of aluminum alloys with high silicon content is gray and can only be dyed dark.

When selecting When using dyes, since the pore walls of the film layer are electropositive, you should first consider using negatively charged anionic dyes (such as direct dyes, acid dyes, vat dyes and reactive dyes). Cationic dyes are positively charged and cannot be dyed. Neutral dyes also have poor adsorption properties and can only dye very light colors.