The dyeing process of bamboo can be roughly divided into two types. One is dye dyeing. This method is to achieve mechanical adhesion of the dye on the surface of the bamboo. There is no chemical reaction during the dyeing process, so it is also called physical dyeing method; the other is chemical dyeing. The basic principle of this method is to use chemicals to diffuse or adsorb into the cell walls of bamboo to change the color of the fibers of the main components of bamboo. This process is accompanied by a chemical reaction, so it is also called chemical dyeing.
Several methods of dyeing that are usually used are now introduced to the reader for reference.
1. Synthetic dye dyeing method. This staining method is theoretically a physical staining method. At present, there are already synthetic dyes for bamboo produced by domestic manufacturers. (When a special dye is not available for a time, it can also be replaced by common synthetic dyes.) This dye is not only bright and durable, but also available in a variety of colors. . The method of dyeing is also extremely simple.
Take 100kg of water, boil it in a dyeing pot, add about 2.5kg of special synthetic dye or use according to the instructions of synthetic dyes, and then put bamboo products such as bamboo stalks and bamboo into the solution for 12-15 minutes, then Take it out and dry it to use.
2. Acid treatment color method: chemical treatment of bamboo products with strong acid can make bamboo products appear bronze. This treatment method belongs to the category of chemical dyeing. The products made of bamboo stalks and bamboo granules after this coloring treatment are antique and unique ethnic.
Take 100kg of water, 1kg of sulfuric acid (H2SO2) or nitric acid (HNO), prepare a solution in an acid-proof container, and immerse the bamboo products such as bamboo stalks or bamboo grains in the acid solution for 10-15 minutes, then place the saturated lime water solution. The medium is neutralized for 30 to 40 minutes, taken out, rinsed with water, and dried to be used. The color depth control of the product can adjust the concentration of the acid solution and the time the product is soaked in the acid solution.
Whether using physical or chemical dyeing, bamboo products can be made to have a brilliant color. In order to achieve satisfactory results in the dyeing process of bamboo products, the following items must be observed during operation.
1 During the operation, the product should be continuously turned over to ensure that it is in full contact with the solution;
2 The concentration of the solution must be accurate, and the dyeing time must be the same. Otherwise, the products dyed in different batches will have different shades of color, and the solution used repeatedly should be supplemented with chemicals;
3 coloring acid has strong corrosiveness, so the coloring time should not be too long, otherwise it will damage the bamboo fiber, reduce the mechanical strength of the product, pay attention to safety during operation, do not let the skin and clothes contact the liquid.
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