There are many classifications of mildew-proof agents.

There are many classifications of mildew-proof agents, and each different classification is used in specific places. For example, the mildew-proof agent for wood is specifically used for the anti-corrosion of wood. 

Fungi grow everywhere in nature, especially in places where the temperature, humidity, and nutrient sources are suitable. Molds grow even faster, which can cause mildew and deterioration of industrial products, as well as agricultural and forestry products. The mildew of foods, clothes, bamboo products, furs, etc., the corruption of cosmetics, the deterioration of oils, the degradation of paints and adhesives, the degradation and aging of rubber and plastic products, the corrosion and damage of metal products, the performance decline and even damage of electronic equipment and appliances, etc., are all related to molds. Moreover, the mildewed products will become pollution sources, endangering other products. In recent years, people have enhanced their awareness of the importance of mildew and mildew-proof agents and actively carried out development and research. At the same time, the requirements for mildew inspection of imported products in various countries around the world are becoming increasingly strict. 

The uses of bactericidal and mildew-proof agents mainly include: (1) for medical external products and cosmetics, (2) for pesticides, (3) for pharmaceuticals, (4) as food additives, (5) for general industrial use (such as wood, pulp, fibers, leather, plastics, rubber, paints, adhesives, metal processing oils, etc.) and (6) for other purposes. 

Among them, the field of antibacterial and mildew-proof agents used in the industrial category is extremely wide, expanding from wood, paper, pulp, petroleum products, adhesives, paints, and the food industry to recent applications such as plastics, lenses, glass products, and computer components. Especially in areas with high humidity, bacteria and fungi are very likely to occur, and antibacterial and mildew-proof agents are indispensable in almost all fields. 

At present, most mildew-proof products at home and abroad can achieve ideal results for dry wood with a moisture content of less than 20%. However, they have poor treatment effects on un-dried and freshly cut wet wood with high moisture content. Especially, the blue stain phenomenon of rubber wood, Korean pine, masson pine, lauan, and maple wood caused by Botryodiplodia theobromae Pat. As is well known, the discoloration of wood is mainly affected by the following factors. 

First: Nutrients: The most suitable nutritional components required by various wood fungi are different. However, all fungi can obtain the nutrients they need from the wood. The carbohydrates in wood, namely starch and monosaccharides, are the main energy required for the growth of blue stain fungi. If the growth of blue stain fungi can be controlled by reducing the content of starch and monosaccharides, the blue stain can be curbed. Obviously, it is not easy for enterprises to achieve this. 

Second: Moisture: Only when the moisture content of wood is higher than 20%, microorganisms such as discoloration fungi can reproduce and grow. Therefore, if the felled wood can be immediately dried to a moisture content of less than 20% and the moisture content is always maintained below 20% during processing and use, the blue stain can be effectively reduced. However, due to various factors such as transportation delays and drying cycles, most log board enterprises find it difficult to dry the wood immediately after felling. 

It can be used on paper in two ways. One is to add a mildew-proof agent during the paper-making process, and the other is to add a mildew-proof agent after the paper is made. 

The first method is to add a mildew-proof agent during the paper-making process. However, this is mainly aimed at the anti-corrosion of the paper, that is, the anti-corrosion of the pulp. Adding a mildew-proof agent to the pulp can extend the anti-corrosion time of the pulp and reduce the losses of manufacturers. Generally, we recommend using a concentration of 5-20 ppm when added to the pulp (calculated based on the pulp water concentration) and 5-10 ppm when added to the white water. It can be added by impact or dropwise addition. The above information is for reference only. The actual required concentration should be determined according to the influence of factors such as seasons, environment, raw materials, and water sources. It is also affected by the degree of infection of different microorganisms. 

The second method is to add it after the paper is completed. In fact, the product should be called mildew-proof paper. This is the paper that has been made and then formed into mildew-proof paper through soaking in a mildew-proof agent solution or other processes. When this kind of paper is used to package other commodities, it can create an antibacterial environment inside the package to inhibit the growth and reproduction of molds, thus achieving the purpose of mildew prevention. The product does not contain DMF and is safe and environmentally friendly.