When certain wood or wood products are to be lightly colored, the natural uneven color of the wood and the stains caused by other causes must be removed by bleaching.
Most of the bleaching methods are applied to the surface of the wood with chemicals. The bleaching process can be carried out on the entire surface of the wood or wood product. More is done on the surface of the wood with a partial color depth.
Bleaching methods The following drugs can be used to bleach wood with a bleach solution.
Hydrogen peroxide, also known as hydrogen peroxide, is a bleaching agent with more applications and better bleaching effect. The commonly used concentration is 15-30%. Applying it to the surface of wood can release strong oxygen, decompose the pigment of wood and make it white. In order to accelerate the release of oxygen, ammonia can be mixed in hydrogen peroxide. A bleaching agent wets the surface of the wood. After ten minutes, the bleach is washed away with cold water. Ammonia water should not be added too much. Under normal circumstances, 25% ammonia water is added in an amount of about 5-10% of hydrogen peroxide.
Second, sodium bisulfite, first with the following two solutions.
1. Mix sodium bisulfite into a saturated solution.
2. Dissolve 6.3 grams of crystalline potassium permanganate in 1000 milliliters of water.
When using, first apply potassium permanganate solution on the surface of wood, about 5 minutes, dry slightly, then apply sodium bisulfite solution, repeat the above operation until the wood turns white.
Third, bleaching powder, it has the following two methods of use.
1. Firstly prepare 5% potassium carbonate and sodium carbonate (1:1) aqueous solution 1 liter, then add 50 grams of bleaching powder, use this solution to brush the wood surface, after bleaching with 2% soapy water or dilute hydrochloric acid solution Clean the bleached surface.
2, first formulated into a solution consisting of 10 grams of bleaching powder, 25 grams of potassium carbonate and 1 liter of water, the wooden parts to be bleached are first washed with alkaline water, then soaked in the above solution for 1-1.5 hours, then with water Wash the surface of the part with hydrochloric acid (5 g/L) and slowly dry it.
There are many kinds of trees used in wood and wood products. The pigments and their distribution in each piece of wood may be different. Therefore, the bleaching agent of the same formula may have different effects. Therefore, the specific bleaching agent concentration on the wood surface. Factors such as the number of paintings and bleaching time should be explored.
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