What is a dust filter bag with water repellent, oil proof? What are the advantages of water and oil repellent filter bags?
1. What is a water and oil repellent filter bag?
Waterproof and oil proof filter bag means that the filter material is not wet by water or oil to a certain extent. Theoretically, whether liquid B can wet solid A depends on the surface tension of the liquid and the critical surface tension of the solid. If the surface tension of the liquid is greater than the critical surface tension of the solid, the liquid cannot penetrate the solid; otherwise, if the surface tension of the liquid is less than the critical surface tension of the solid, the liquid can penetrate the solid.
According to the above analysis, in order to make the best 3 dust collector filter bag waterproof and oil-proof, its surface tension must be reduced to less than the surface tension of water and oil in order to achieve the desired purpose. There are two methods for water and oil repellent treatment. One is the coating method, that is, the layered method is used to prevent the filter material from being soaked by water or oil; The other is the out of forest reaction method, even if the water and oil repellent reacts with some groups in the macromolecular structure of the fiber to form a macromolecular chain, which changes the affinity of the fiber with water and oil and becomes a water and oil repellent. The former usually makes the product lose air permeability, while the latter only produces water and oil repellent effect on the fiber surface. The gap between the fibers is not blocked, which does not affect the permeability. This is exactly what the dust removal filter bag needs. Therefore, reaction treatment is generally used.
2. How to produce water and oil repellent filter bags
At present, there are many waterproof and oil-proof additives, such as aluminum soap, silicone, oil wax, rubber, stearic acid cheese, PVC resin, fluoride, etc., of which only aluminum soap, silicone, fluoride and stearic acid cheese are suitable for reactive type. Considering the special use of needle felt, additives are needed: ① it can make needle felt waterproof and oil proof; ② High temperature resistance; ③ Corrosion resistance; ④ Durability; ⑤ Do not change the permeability of the original product. The surface tension of the above additives is between 10-30dyn/cm, which is far lower than that of water. They will not be soaked by backwater and have waterproof lines. However, the surface tension of fluoride is similar to that of heavy oil 29dyn/cm and vegetable oil 32dyn/cm, and it has a certain wettability. Only the surface tension of fluoride is about 10dyn/cm, which is lower than that of various liquids, so it has high water resistance and oil resistance. Therefore, fluoride is a better auxiliary material.
Dust collector filter bag production process:
Fiber loosening… Carding… Folding… Needling… Main needling… Calendaring… Impregnating water repellent and oil proof working fluid – baking – heat setting… Finished product
After being treated with water and oil repellent, various filter materials can form a molecular barrier around the fiber surface, which can prevent water and various greasy dirt from adhering and penetrating. Compared with ordinary filter materials, it not only has the characteristics of water and oil repellency, but also has the properties of anti-adhesion and easy peeling for dust. The water repellent, oil proof and dust removal cloth bag is especially suitable for filtering occasions in rainy areas and high air humidity.
3. Advantages of water and oil repellent cloth filter bag:
1)Water and oil repellent.
2)For dust, it also has anti adhesion and easy peeling.
3)The filter material is not easy to block the paste bag, prolong the ash cleaning cycle, and prolong the service life of the filter bag.
4)It is suitable for filtering occasions in rainy areas and high air humidity, or when the temperature of the dust collector box is lower than the dew point temperature.
5)The gas flow through is also increased, and the user’s energy consumption and later maintenance costs are correspondingly reduced.
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