How to bleach solid wood panels

Wood bleaching is to destroy the chromogenic groups or co-color groups and color-related components in the wood through the oxidation, reduction and price reduction of bleaching agents to achieve the purpose of decolorization. Wood bleaching has been used for a considerable period of time in the production of wood processing industry at home and abroad. Since 1995, Dr. Chen Yuhe of the Chinese Academy of Forestry has carried out research on the bleaching technology of paulownia wood, the research on the promotion of wood bleaching by sodium hydroxide pretreatment, and the study of hydrogen peroxide decomposition rate in the process of wood bleaching.

Wood bleaching factor one is the type of wood that needs to be processed; second, economy, low production cost; The third is environmental protection, that is, there is no harm to the operator, no harm to the users of wood, and no harm to the environment; Fourth, there is no harm to the follow-up process, and it does not affect dyeing, gluing or painting. Fifth, after bleaching, the wood is not easy to yellow, and the damage to the material is small.

Wood bleach is mainly divided into oxidized bleach and reduced bleach. Reducing bleaching agents include sulfur dioxide, sodium bisulfite, etc., which have a tendency to be re-oxidized and recolored, and are rarely used at present. There are many kinds of oxidizing bleach, and the main ones that have been widely used on a large scale in the wood industry are hydrogen peroxide, sodium hypochlorite, sodium chlorite, etc.

Wood bleaching methods come in a variety of forms, depending on the requirements of the product. There is room temperature bleaching and there is also high temperature bleaching, but room temperature bleaching must be accompanied by appropriate catalysts. There is surface bleaching and deep bleaching of veneer, and for the latter, the whiteness of the veneer inside and outside is required to be consistent.

According to the characteristics of the bleaching process, it is divided into brush bleaching and dip bleaching. Brushing bleaching is mainly used for solid wood surface treatment, such as the surface homogenization of transparently coated furniture. Dipping bleaching is an advanced treatment of wood, mainly a pretreatment for wood dyeing.

Answer: Hydrogen peroxide, also known as hydrogen peroxide, is a kind of bleach that is more widely used and has a better bleaching effect. The commonly used concentration is 15 30, it can release strong oxygen on the surface of the wood, decompose the pigment of the wood, make it white, in order to accelerate the release of oxygen, ammonia can be mixed with hydrogen peroxide, wet the surface of the wood with this bleach, after more than ten minutes, wash off the bleach with cold water. Ammonia should not be added too much, under normal circumstances, the amount of ammonia added to 25 is about 5 10 of hydrogen peroxide.