1 Features and causes
The phenolic component in the wood turns red due to the adhesion of the acidic substance to the oxidation of the mold in the wood and the oxygen in the air. This red-induced pollution occurs mostly on the surface of the wood. For example, when the amino acid enzyme is used for coating, the added acid curing agent is excessive, and the surface after coating becomes red; the newly harvested Alnus jponica acts as an oxidase. Underneath, the surface of the wood will all turn red; the paulownia material will also undergo a large area of ​​red.
If the wood conduit changes red, the surface of the wood will be red or silky. It can be seen by microscopic observation that there are reddened spider webs and sporangia in the catheter, which can be considered as red matter produced by the fungus in the duct.
2 Redening and prevention of red
When the wood is coated with an amino acid paint, the acidic substance is susceptible to chemical reaction with the phenolic component and reddened, and neutralization with alkali can reduce the degree of reddening, but cannot be completely eliminated. Decolorization with bleach can remove color, but it also damages the original color of the wood. The substance that is reddened by the fungus is a bacterial cell or a metabolite thereof, which is coated with a mildly reducing substance such as sodium hydrogen sulfite, which does not damage the primary color of the wood, and can remove red discoloration, indicating that the red substance is likely to be 醌Class of substances.
The main prevention of red pollution is:
(1) If it is caused by the application of acidic substances, the amount of acidic substances should be controlled as much as possible. When using the coating curing agent, high ambient temperature should be ensured to promote the agglomeration reaction, thereby reducing the curing agent. Dosage.
(2) The contamination caused by the enzyme can be prevented as long as there is no suitable enzyme production environment. An enzyme can be considered as a proteinaceous material that is active under weak acid or neutral conditions. The prevention method is to treat the surface of the wood with acidic or weakly alkaline treatment; the second is to change the protein properties by boiling and high frequency heating.
(3) When the substance causing discoloration is water-soluble, a large amount of water can be used to continuously dissolve the substance. In the past, in order to prevent the redness of the paulownia material, it is usually the case that the sawn timber is placed in the outdoor rain for a long time, so that the substance causing the discoloration is dissolved by the water, and the method of promoting dissolution can also be adopted on the basis of the principle.
(4) Prevent the reproduction of bacteria. Because the first is invaded after the generation, the logs should be sawed and dried as soon as possible. During the long-distance transportation of logs, transportation and storage should be kept as low as possible, otherwise it will be difficult to prevent the invasion of bacteria.
The phenolic component in the wood turns red due to the adhesion of the acidic substance to the oxidation of the mold in the wood and the oxygen in the air. This red-induced pollution occurs mostly on the surface of the wood. For example, when the amino acid enzyme is used for coating, the added acid curing agent is excessive, and the surface after coating becomes red; the newly harvested Alnus jponica acts as an oxidase. Underneath, the surface of the wood will all turn red; the paulownia material will also undergo a large area of ​​red.
If the wood conduit changes red, the surface of the wood will be red or silky. It can be seen by microscopic observation that there are reddened spider webs and sporangia in the catheter, which can be considered as red matter produced by the fungus in the duct.
2 Redening and prevention of red
When the wood is coated with an amino acid paint, the acidic substance is susceptible to chemical reaction with the phenolic component and reddened, and neutralization with alkali can reduce the degree of reddening, but cannot be completely eliminated. Decolorization with bleach can remove color, but it also damages the original color of the wood. The substance that is reddened by the fungus is a bacterial cell or a metabolite thereof, which is coated with a mildly reducing substance such as sodium hydrogen sulfite, which does not damage the primary color of the wood, and can remove red discoloration, indicating that the red substance is likely to be 醌Class of substances.
The main prevention of red pollution is:
(1) If it is caused by the application of acidic substances, the amount of acidic substances should be controlled as much as possible. When using the coating curing agent, high ambient temperature should be ensured to promote the agglomeration reaction, thereby reducing the curing agent. Dosage.
(2) The contamination caused by the enzyme can be prevented as long as there is no suitable enzyme production environment. An enzyme can be considered as a proteinaceous material that is active under weak acid or neutral conditions. The prevention method is to treat the surface of the wood with acidic or weakly alkaline treatment; the second is to change the protein properties by boiling and high frequency heating.
(3) When the substance causing discoloration is water-soluble, a large amount of water can be used to continuously dissolve the substance. In the past, in order to prevent the redness of the paulownia material, it is usually the case that the sawn timber is placed in the outdoor rain for a long time, so that the substance causing the discoloration is dissolved by the water, and the method of promoting dissolution can also be adopted on the basis of the principle.
(4) Prevent the reproduction of bacteria. Because the first is invaded after the generation, the logs should be sawed and dried as soon as possible. During the long-distance transportation of logs, transportation and storage should be kept as low as possible, otherwise it will be difficult to prevent the invasion of bacteria.
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