The reason why antiseptic wood has such a name is that it can resist corrosion, but it does not include that it can resist all kinds of corrosion. When we use it, we need to understand this kind of situation. Generally speaking, the use effect of this kind of wood is better. When we find its discoloration phenomenon, there are many common chemical discoloration causes. We should pay attention to the following Let's get to know about Shandong preservative wood.
When it is exposed to humid air for a long time, it will change color. It is not caused by fungi infecting wood, but by chemical reaction of some components in wood, which is called chemical discoloration.
The oxidation condensation reaction of tannin, pigment, alkaloid, sugar, phenol and other organic matter in preservative wood is mainly the oxidation of phenol in wood. Phenolic compounds have benzene ring structure and are easy to be oxidized, which is the cause of chemical discoloration. Before oxidation, phenolic compounds are colorless, some of which are soluble in water; after oxidation, they form water-insoluble condensates with red, reddish brown and brown colors, so chemical discoloration is also called oxidation discoloration.
Some preservative wood contains tannin, also known as vegetable tannin, which is a mixture of polyphenols. When it comes into contact with iron under humid conditions, the tannin and iron will have a chemical reaction (complexing reaction) to form iron tannate. Iron tannate is black and is the main raw material used to make ink, which makes the wood black. According to the amount of iron and the contact time between wood and iron, the color of wood changes from light gray to blue black. Similarly, when wood is soaked in water with high iron content, the chemical discoloration of wood will also occur. In addition, the wood is in contact with copper or copper gold.
由于木材中的單寧與銅發生化學反應，生成單寧酸銅，也會使木材變色 (淺紅色)。 在木材干燥過程也常發生化學變色。這主要是由于木材干燥速度慢造成的，與墊木接觸的部位尤其如此?；瘜W變色的特點是變色深度淺，變色比較均勻一致。
The tannin in wood reacts with copper to form copper tannate, which can also change the color of wood (light red). Chemical discoloration also occurs during wood drying. This is mainly due to the slow drying speed of wood, especially in the parts contacting with the bedding wood. Chemical discoloration is characterized by shallow discoloration depth and uniform discoloration.
Chemical discoloration of preservative wood is the content mentioned above. When we use this kind of wood, we should know something about preservative wood in advance, especially its unsuitable environment. If you need this kind of wood, or want to know more about it, you can contact us through some ways. We will provide you with suitable wood according to your actual needs.