Formulation and application of several common bleaching agents

2021-09-13 14:52:15

Use methods of several common bleaches:

1. After mixing hydrogen peroxide solution (30 ~ 35%) and ammonia (28%) in the ratio of 1: l, apply it on the surface of the veneer and let it dry slowly, and the veneer surface has been bleached. This has a good bleaching effect with bleach. It can be applied at one time, but the storage and use time of the bleach is only 30 minutes and there is ammonia odor. The operating conditions are poor, so it is required to apply it quickly

2. Two liquid coating: prepare two liquids according to the following formula, i.e. liquid a and liquid B. liquid A: 10g anhydrous calcium carbonate, add 60g of 50 ℃ warm water, liquid B: 80ml of hydrogen peroxide solution (35%), add 20ml of water, apply liquid a on the veneer surface first, let it penetrate fully and evenly, wipe off the exudate on the surface with a cloth after 5min, then apply liquid B, dry for 3h, and wipe the surface with a wet cloth after drying, Until the yellow is gone. If you want to improve the bleaching effect, the drying time can be extended to 18 ~ 24h. When using this bleaching solution, you should pay attention that liquid a and liquid B cannot be mixed, and the container and brush should be separated

3. 3G sodium imine + 100g water is used to prepare bleaching solution. Before use, add the solution prepared with 0.5g glacial acetic acid and 100g water. Apply the bleaching solution to the surface of the veneer and dry it at 60 ~ 70 ℃ for 5 ~ 10min. The veneer has been bleached

4. 5g sodium hypochlorite and 95g water are added to heat and dissolve it at the same time, and then coated on the surface of thin wood by heat, or coated after adding a small amount of benzoic acid or sulfuric acid. This method has a good effect on bleaching Eucalyptus.